Consulta: subjectFacets:"Seasonality"
Registros recuperados: 208
Data/hora: 13/06/2024 11:06:14

Dinámica de microorganismos rizosféricos y filosféricos de Annona diversifolia Saff. Como respuesta a la estacionalidad, fenología y defoliación en el trópico seco
Provedor de dados: 32
Autores: Cortés Sarabia, Jazmín.
La ilama es una planta frutícola tropical, cuya distribución se encuentra restringida a México,  Centroamérica y parte de Sudamérica y cuyo cultivo es de importancia local. Dado el escaso  conocimiento sobre la dinámica microbiana en este tipo de cultivo, este estudio tuvo como  objetivo evaluar el efecto de la estacionalidad, fenología y defoliación sobre la dinámica  poblacional microbiana en filósfera y rizosfera de plantas de ilama (Annona diversifolia Saff.),  en campo e invernadero. Se evaluaron plantas de tres edades en cuatro épocas del año en San  Antonio de las Huertas, Guerrero. Se evaluaron las unidades formadoras de colonias (UFC) de  hongos, actinomicetos, bacterias totales así como bacterias fijadoras de nitrógeno pertenecientes  a los...
Tipo: Tesis
Palavras-chave: Bacterias fijadoras de nitrógeno; Bacterias solubilizadoras de fosfatos; Fenología; Estacionalidad; Defoliación; Micorriza arbuscular; Maestría; Edafología; Nitrogen-fixing bacteria; Solubilizing phosphate bacteria; Phenology; Seasonality; Defoliation; Arbuscular mycorrhizae.
Ano: 2008
URL: http://hdl.handle.net/10521/1267

Local Perceptions of Climate Variability and Change in Tropical Forests of Papua,  Indonesia
Provedor de dados: 7
Autores: Sheil, Douglas; Center for International Forestry Research (CIFOR);Institute of Tropical Forest Conservation (ITFC);School of Environmental Science and Management Southern Cross University ; douglassheil@itfc.org; Padmanaba, Michael; Center for International Forestry Research (CIFOR); M.Padmanaba@cgiar.org; Sadjudin, Ermayanti; Conservation International; ermayanti@conservation.org.
People everywhere experience changes and events that impact their lives.  Knowing how they perceive, react, and adapt to climatic changes and events is helpful in developing strategies to support adaptation to climate change. Mamberamo in Papua, Indonesia, is a sparsely populated watershed of 7.8 million hectares possessing rich tropical forests. Our study compares scientific and traditional ecological knowledge (TEK) on climate, and analyzes how local people in Mamberamo perceive and react to climatic variations. We compared meteorological data for the region with local views gathered through focus group discussions and interviews in six villages. We explored the local significance of seasonality, climate variability, and climate change. Mamberamo is...
Tipo: Peer-Reviewed Reports
Palavras-chave: Adaptive strategy; Coping mechanism; Deforestation; Ecosystem services; Gender; Seasonality; Traditional ecological knowledge.
Ano: 2013

Association between AA-NAT gene polymorphism and reproductive performance in sheep
Provedor de dados: 69
Autores: Ding-ping,Bai; Cheng-jiang,Yu; Yu-lin,Chen.
Arylalkylamine N-acetyltransferase (AA-NAT) is critical enzyme in Melatonin (MLT) biosynthesis for MLT regulating the animal seasonal breeding. In this study, DNA sequencing methods were applied to detect the polymorphisms of the AA-NAT gene in 179 Chinese sheep belonging to two non-seasonal reproduction breeds and two seasonal reproduction breeds. One mutation at exon 3 (NM_001009461:c.486A &amp;gt; G) was &amp;#64257;rstly described at the sheep AA-NAT locus. Hence, we described the SmaI PCR-RFLP method for detecting EX3 486A &amp;gt; G mutation, frequencies of the AA-NAT-G allele varied from 0.871 to 0.908 in two non-seasonal reproduction breeds and 0.517 to 0.578 in two seasonal reproduction breeds. The associations of SmaI polymorphism with estrus...
Tipo: Journal article
Palavras-chave: AA-NAT gene; Polymorphism; Reproduction; Seasonality; Sheep.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000200007

Seasonal limnetic feeding regime of the “robalo” Eleginops maclovinus (Valenciennes 1830), in the Valdivia river, Chile
Provedor de dados: 72
Autores: Pequeño,Germán; Pavés,Héctor; Bertrán,Carlos; Vargas-Chacoff,Luis.
The “robalo” Eleginops maclovinus (Valenciennes 1830) is a common fsh in the littoral, estuaries and rivers (under tidal effects zone) of southern South América, including the Falkland islands. The feeding habits of this species is known mainly in the two frst mentioned habitats, where it consumes mostly animals from marine and estuarine origin. However, little is known about its seasonal feeding habits in limnetic environments. It is only assumed that it has to eat preys from freshwater origin. In the present study, 127 specimens of E. maclovinus were analysed, 119 of which had stomach contents. The zoophagic tendency of the species is corroborated, but also animáis from low salinities and limnetic salinities were found to be consumed inthe freshwater...
Tipo: Journal article
Palavras-chave: Feeding; Seasonality; Eleginopsidae; Physiological versatility; Chile; Alimentación; Estacionalidad; Eleginopsidae; Versatilidad fisiológica; Chile.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382010000100008

Can climate shape flight activity patterns of Plebeia remota Hymenoptera, Apidae)?
Provedor de dados: 76
Autores: Hilário,Sergio D.; Ribeiro,Márcia de F.; Imperatriz-Fonseca,Vera L.
Flight activity of foragers of four colonies of Plebeia remota (Holmberg, 1903) was registered from December 1998 to December 1999, using an automated system (photocells and PLC system). The colonies originated from two different regions: Cunha, state of São Paulo, and Prudentópolis, state of Paraná, Brazil. Flight activity was influenced by different climatic factors in each season. In the summer, the intensity of the correlations between flight activity and climatic factors was smaller than in the other seasons. During the autumn and winter, solar radiation was the factor that most influenced flight activity, while in the spring, this activity was influenced mainly by temperature. Except in the summer, the various climatic factors similarly influenced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stingless bees; Foraging; Climatic factors; Seasonality; Geographic distribution.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000300004

Seasonal variation in natural populations of Drosophila spp. (Diptera) in two woodlands in the State of São Paulo, Brazil
Provedor de dados: 76
Autores: Torres,Felipe Rafael; Madi-Ravazzi,Lilian.
The composition and the seasonality of the natural populations of Drosophila species in relation to the climatic variables temperature and rainfall were analyzed from September 1998 through October 1999 by monthly collections, in two woodlands in the Northwest of the State of São Paulo, Brazil. The diversity dominance component curves were inclined, reflecting low diversity and high dominance of few species. Among the 25 species recorded, Drosophila sturtevanti Duda, 1927 was the most frequent and abundant. On the opposite to data in literature, D. paranaensis Barros, 1950 abundance and frequency were greater than those from D. mercatorum Patterson &amp;amp; Wheeler, 1942. A positive correlation between abundance and rainfall was observed for D. nebulosa...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Abiotic factors; Seasonality; Drosophila; Biodiversity.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212006000400008

Reproduction and feeding ecology of Amphisbaena munoai and Anops kingi (Amphisbaenia, Amphisbaenidae) in the Escudo Sul-Rio-Grandense, southern Brazil
Provedor de dados: 76
Autores: Balestrin,Rafael L; Cappellari,Lize H.
This study presents original data on the reproduction and feeding ecology of two syntopic amphisbaenians, Amphisbaena munoai Klappenbach, 1969 and Anops kingi Bell, 1833, from southern Brazil. Sampling was carried out from April 2004 to April 2006 at a highland area located in São Jerônimo and Barão do Triunfo municipalities, Rio Grande do Sul, Brazil. A total of 647 amphisbaenians were collected, 510 specimens of A. munoai and 137 specimens of A. kingi, of which 130 and 93, respectively, had their gonads and gut content analyzed. Both species presented a unimodal pattern of seasonal distribution, sexually mature females with significantly larger snout vent length (SVL) than sexually mature males, and seasonal reproductive cycle. Adults of A. kingi had...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seasonality; Sexual dimorphism; Diet.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212011000100013

Seasonal variation of the effect of high-carbohydrate and high-protein diets on the intermediate metabolism of Parastacus brasiliensis (Crustacea, Decapoda, Parastacidae) maintained in the laboratory
Provedor de dados: 76
Autores: Dutra,Bibiana K.; Silva,Karina M. da; Zank,Caroline; Conter,Maria R.; Oliveira,Guendalina T.
The goal of this study was to evaluate the effect of a high-carbohydrate diet (HC) and a high-protein diet (HP) on the metabolism of the crayfish Parastacus brasiliensis (Von Martens, 1869), collected in different seasons and maintained in the laboratory for 15 days. Crayfish were collected monthly from January 2002 to January 2004 at São Francisco de Paula, Southern Brazil, in Guarapirá stream. In the laboratory, the animals were kept submerged in aquariums under controlled conditions. They were fed ad libitum, for 15 days with either a HC or HP diet. At the end of this period, haemolymph samples were collected, as were hepatopancreas, gills, and abdominal muscle that were removed for determination of glycogen, free glucose, lipids, and triglycerides. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crayfish; Experimental culture; Diet; Metabolism; Seasonality.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212008000400003

Influence of seasonal changes in daily activity and annual life cycle of Geotrigona mombuca (Hymenoptera, Apidae) in a Cerrado habitat, São Paulo, Brazil
Provedor de dados: 76
Autores: Gobatto,André L.; Knoll,Fátima R. N.
The foraging activity of Geotrigona mombuca Smith, 1863 was studied under natural conditions aiming to verify the influence of seasonal changes on daily flight activity and annual cycle of the colony. Daily flight activity was monitored for a year based on the observation and counting of foragers leaving and entering the hive, as well as the kind of material transported and meteorological factors such as day time, temperature and relative humidity. The influence of seasonal changes was evidenced by alterations on daily rhythm of flight activity and by differences on transportation of food resources, building material and garbage. These data indicate that forager behavior is related to daily microclimate conditions and it is synchronized with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meteorological factors; Daily activity; Seasonality; Floral resources.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212013000400006

Seasonal dynamics of a drosophilid (Diptera) assemblage and its potencial as bioindicator in open environments
Provedor de dados: 76
Autores: Bizzo,Luís; Gottschalk,Marco S; Toni,Daniela C. De; Hofmann,Paulo R. P.
Drosophila Fallen, 1823 (Diptera, Drosophilidae) is for long a well-established model organism for genetics and evolutionary research. The ecology of these flies, however, has only recently been better studied. Recent papers show that Drosophila assemblies can be used as bioindicators of forested environment degradation. In this work the bioindicator potential of drosophilids was evaluated in a naturally opened environment, a coastal strand-forest (restinga). Data from nine consecutive seasonal collections revealed strong temporal fluctuation pattern of the majority of Drosophila species groups. Drosophila willistoni group was more abundant at autumns, whereas D. cardini and D. tripunctata groups were, respectively, expressive at winters and springs, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drosophila; Seasonality; Bioindicators; Restinga; Brazil.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212010000300001

Reproductive characteristics of characid fish species (Teleostei, Characiformes) and their relationship with body size and phylogeny
Provedor de dados: 76
Autores: Azevedo,Marco A.
In this study, I investigated the reproductive biology of fish species from the family Characidae of the order Characiformes. I also investigated the relationship between reproductive biology and body weight and interpreted this relationship in a phylogenetic context. The results of the present study contribute to the understanding of the evolution of the reproductive strategies present in the species of this family. Most larger characid species and other characiforms exhibit a reproductive pattern that is generally characterized by a short seasonal reproductive period that lasts one to three months, between September and April. This is accompanied by total spawning, an extremely high fecundity, and, in many species, a reproductive migration. Many species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical; Reproductive period; Seasonality; Fecundity; Type of spawning; Mode of reproduction; Insemination.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212010000400020

Fish assemblage composition in a tributary of the Mogi Guaçu river basin, southeastern Brazil
Provedor de dados: 76
Autores: Oliveira,Alexandre Kannebley de; Garavello,Júlio César.
Fish assemblage composition and seasonal patterns of species abundance were studied in Cabaceiras stream, a tributary of the Mogi Guaçu river in São Paulo State, Brazil. Three stations were sampled monthly from June 1999 to May 2000 using sieves and small trawl net and gill nets. Fifteen fish families, 37 genera and 45 species were captured. Characiformes (27 spp.) and Siluriformes (13 spp.) were the most species-rich orders. Gymnotiformes and Perciformes were represented by two species each, and Synbranchiformes had only a single species. One group of species (approximately 75 %) persisted in the stream throughout the year. A second group (approximately 25 %) contained species that only occupy the stream for a limited period of their life cycle, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fishes; Seasonality; Stream; Paraná system; Mogi Guaçu river.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212003000200002

Diversity of social wasps (Hymenoptera, Vespidae) in Cerrado biome of the southern of the state of Minas Gerais, Brazil
Provedor de dados: 76
Autores: Simões,Matheus H.; Cuozzo,Mariana D.; Frieiro-Costa,Fernando A.
An inventory of social wasps in Cerrado biome of the southern of the state of Minas Gerais was performed. A comparison between field and Riparian Forest areas was made in relation to species richness; correlations between diversity, sample methods and environmental factors were conducted. A total of 32 species was registered and Polybia fastidiosuscula de Saussure, 1854 was the most abundant species. The higher richness was in the Cerrado Field, as well as the highest diversity index. The temperature and rainfall had significant correlation with species richness and a significant variation in richness between dry and wet seasons was observed. Polybia fastidiosuscula was more abundant in the Riparian Forest during the dry season and in the Cerrado Field...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polistinae; Inventory; Composition; Seasonality.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000300007

The lizard that never sleeps: activity of the pampa marked gecko Homonota uruguayensis
Provedor de dados: 76
Autores: Vieira,Renata C.; Verrastro,Laura; Borges-Martins,Márcio; Felappi,Jéssica F.
ABSTRACT It is generally assumed that lizards are active whenever climatic conditions are favorable. Homonota uruguayensis (Vaz-Ferreira &amp; Sierra de Soriano, 1961) is the only native gecko - and nocturnal lizard - living in the northern Pampa biome, and its ecology is poorly known. This study aimed at describing this species’ pattern of daily and annual activity and its relation with environmental temperatures. The study was conducted in the extreme south of Brazil (Rosário do Sul, State of Rio Grande do Sul), between May 2010 and January 2011 at a rocky outcrop located in the Pampa biome. The study was carried out in a total of four seasonal field trips, totalizing 1185 hours of field work. The data were collected, both during the day and the night in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nocturnal activity; Uruguayan savanna; Seasonality; Thermal ecology.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212020000100211

Mutucas (Diptera: Tabanidae) do Pantanal: abundância relativa e sazonalidade na sub-região da Nhecolândia.
Provedor de dados: 14
Autores: BARROS, A. T. M.; FOIL, L. D.; VAZQUEZ, S. A. de S.
De junho/92 a maio/94, capturas de mutucas foram realizadas mensalmente em eqüino e utilizando armadilhas do tipo ?canopy?, na fazenda Nhumirim, subregião da Nhecolândia, Pantanal sul-mato-grossense. Capturas no eqüino foram realizadas do crepúsculo matutino ao vespertino, com o auxílio de redes entomológicas, em ambientes de campo e cerradão (1 dia/ambiente/mês), durante o primeiro ano do estudo. Capturas com armadilhas foram realizadas nos mesmos ambientes (10 dias/ambiente/mês), por dois anos. Foram capturadas 6.274 mutucas ao longo do estudo, pertencentes a 25 espécies, 13 gêneros e 3 subfamílias. A espécies mais abundantes foram Tabanus importunus (44,04%), Tabanus occidentalis (15,95%), Tabanus claripennis (9,98%) e Lepiselaga crassipes (7,60%)....
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Mutuca; Sazonalidade; Ectoparasita; Tabanídeo; Tabanid; Insect; Seasonality; Deer fly; Ectoparasite; Horse; Horse fly; Vector.; Eqüino; Inseto; Vetor.; Pantanal.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/811098

The Spatiotemporal Dynamics of the Sources and Sinks of CO2 in the Global Coastal Ocean
Provedor de dados: 5
Autores: Roobaert, Alizee; Laruelle, Goulven G.; Landschuetzer, Peter; Gruber, Nicolas; Chou, Lei; Regnier, Pierre.
In contrast to the open ocean, the sources and sinks for atmospheric carbon dioxide (CO2) in the coastal seas are poorly constrained and understood. Here we address this knowledge gap by analyzing the spatial and temporal variability of the coastal air-sea flux of CO2 (FCO2) using a recent high-resolution (0.25 degrees) monthly climatology for coastal sea surface partial pressure in CO2 (pCO(2)). Coastal regions are characterized by CO2 sinks at temperate and high latitudes and by CO2 sources at low latitude and in the tropics, with annual mean CO2 flux densities comparable in magnitude and pattern to those of the adjacent open ocean with the exception of river-dominated systems. The seasonal variations in FCO2 are large, often exceeding 2 mol C m(-2)...
Tipo: Text
Palavras-chave: Coastal seas; Air-sea CO2 exchange; Seasonality; Ocean carbon cycle; Continental shelves.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00676/78795/81027.pdf

Impact d’une obligation de débarquement sur les dynamiques couplées écosystème-pêcheurs : approche par modélisation individu-centrée appliquée à la Manche orientale
Provedor de dados: 5
Autores: Bourdaud, Pierre.
The objective of this thesis was to anticipate the effects if the EU Landing Obligation (LO) implemented since the beginning of 2015 in the Eastern English Channel (EEC). To achieve these objectives, it was planned to: i) better understand seasonal spatial distribution of commercial species using on-board commercial vessels observation data, ii) compare them with the fine scale fishing effort distribution of EEC bottom otter trawlers (OTB), and iii) develop an individual-based model of fleet-dynamics, DSVM, to be integrated within the ecosystem model OSMOSE to simulate a LO. The usefulness of on-board observation data was proved for a main part of a species sample, using validation from the literature and a geostatistical indicator. Then the comparison of...
Tipo: Text
Palavras-chave: Distribution spatiale; Saisonnalité; Données commerciales; Données de campagnes scientifiques; Manche Orientale; Effort de pêche; Assemblages d’espèces cibles; Obligation de débarquement; Modèle individu-centré; Dynamiques des flottilles; Spatial distribution; Seasonality; Commercial data; Survey data; Eastern English Channel; Fishing effort; Target species assemblages; Landing obligation; Individual-based model; Fleet dynamics.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00440/55135/56603.pdf

Seasonality of internal gravity waves kinetic energy spectra in the Ligurian Basin
Provedor de dados: 5
Autores: Van Haren, Hans; Millot, Claude.
In the central Ligurian Basin, Western Mediterranean Sea, dense water formation occurs in winter so that near-surface stratification displays a marked seasonality. Consequently, kinetic energy spectra from the surface to intermediate depths are entirely different in summer and winter. In summer, the spectra show a peak near the local inertial frequency (f). The polarization of currents in the internal gravity wave frequency (sigma) band (f &lt; sigma &lt; N, N the buoyancy frequency) resembles internal wave theory (for N &gt;&gt;f). In winter, however, no significant near-inertial (or any other) spectral peak is observed and motions are not polarized at any frequencies, whatever the observation depths. With respect to the energy levels observed in summer,...
Tipo: Text
Palavras-chave: Ligurian Sea; Kinetic energy spectra; Internal gravity wave; Seasonality; Mer Ligure; Spectres d'énergie cinétique; Ondes internes de gravité; SeaVariations saisonnières.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-534.pdf

Mesoscale eddy variability in the southern extension of the East Madagascar Current: Seasonal cycle, energy conversion terms, and eddy mean properties
Provedor de dados: 5
Autores: Halo, Issufo; Penven, Pierrick; Backeberg, Bjoern; Ansorge, Isabelle; Shillington, Frank; Roman, Raymond.
In this study, we used more than 17 years of satellite altimetry observations and output from an ocean model to investigate the mesoscale eddy variability and forcing mechanisms to the south of Madagascar. Analysis of energy conversion terms in the model has shown seasonality on eddy formation, both by barotropic and baroclinic instabilities: maximum in winter (JJA) and minimum in summer (DJF). The eddies were mainly formed in the upper ocean (0–300 m) and at intermediate depths (800–2000 m) by barotropic and baroclinic instabilities, respectively. The former dominated in the southeastern margin of Madagascar, and the latter to the southwest, where the South-East Madagascar Current (SEMC) separates from the continental shelf. Seasonality of the eddy...
Tipo: Text
Palavras-chave: Mesoscale eddies; Barotropic; Baroclinic instabilities; Seasonality; Eddy properties; Variability.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00222/33348/31749.pdf

Seasonal and subseasonal climate changes recorded in laminated diatom ooze sediments, Adelie Land, East Antarctica
Provedor de dados: 5
Autores: Denis, Delphine; Crosta, X; Zaragosi, S; Romero, O; Martin, B; Mas, Virginie.
A 40 m long sediment core covering the 1000-9600 years BP period was retrieved from the Dumont d'Urville Trough off Adelie Land, East Antarctica, during the MD 130-Images X-CADO cruise. This sedimentary sequence allows the documentation of changes in climate seasonality during the Holocene. Here we show preliminary results of diatom communities, lithic grain distribution and titanium content measured on two 30 cm long sequences of thin sections. The two sequences originate from two different climate regimes, the colder Neoglacial and the warmer Hypsithermal. Proxies were measured at microscale resolution on 25 laminations for the Neoglacial and 14 laminations for the Hypsithermal. The two sequences reveal alternating light-green and dark-green laminae....
Tipo: Text
Palavras-chave: East Antarctica; Sea ice; Seasonality; Diatom ooze; Laminated sediments; Holocene; Adelie Land.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2275.pdf

Antarctic icebergs: A significant natural ocean sound source in the Southern Hemisphere
Provedor de dados: 5
Autores: Matsumoto, Haru; Bohnenstiehl, Delwayne R.; Tournadre, Jean; Dziak, Robert P.; Haxel, Joseph H.; Lau, T. -k. A.; Fowler, Matt; Salo, Sigrid A.
In late 2007, two massive icebergs, C19a and B15a, drifted into open water and slowly disintegrated in the southernmost Pacific Ocean. Archived acoustic records show that the high-intensity underwater sounds accompanying this breakup increased ocean noise levels at mid-to-equatorial latitudes over a period of ∼1.5 years. More typically, seasonal variations in ocean noise, which are characterized by austral summer-highs and winter-lows, appear to be modulated by the annual cycle of Antarctic iceberg drift and subsequent disintegration. This seasonal pattern is observed in all three Oceans of the Southern Hemisphere. The life cycle of Antarctic icebergs affects not only marine ecosystem but also the sound environment in far-reaching areas and must be...
Tipo: Text
Palavras-chave: Antarctica; Iceberg; Ocean noise; Seasonality; Trend.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00205/31613/30035.pdf

Single foraminifera Mg/Ca analyses of past glacial-interglacial temperatures derived from G. ruber sensu stricto and sensu lato morphotypes
Provedor de dados: 5
Autores: Schmitt, A.; Elliot, M.; Thirumalai, K.; La, C.; Bassinot, F.; Petersen, J.; Movellan, A.; Jorry, Stephan; Borgomano, J.
The ratio of magnesium to calcium (Mg/Ca) in foraminiferal shells is commonly used as a proxy for past ocean temperature. Recent advances in elemental analyses now enable single-specimen measurements of planktic foraminifera and thus, can provide information on past seasonal and interannual variability, owing to the near-monthly lifespan of foraminifera. In this study, we explore the temperature variance recorded by Mg/Ca in tests of foraminifera Globigerinoides ruber, a planktic species that occurs throughout the year in tropical waters. Using LA-ICP-MS, we characterize Mg/Ca variability in single specimens of two morphotypes of G. ruber picked from a sediment core retrieved offshore New Caledonia. We provide an estimate of the range of calcification...
Tipo: Text
Palavras-chave: Globigerinoides ruber; Mg/Ca ratio; Sea surface temperature; LA-ICPMS; Seasonality; Quaternary.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00472/58336/60890.pdf

Coastal phytoplankton community dynamics and coexistence driven by intragroup density-dependence, light and hydrodynamics
Provedor de dados: 5
Autores: Barraquand, F.; Picoche, C.; Maurer, Daniele; Carassou, L.; Auby, Isabelle.
Phytoplanktonic communities maintain a high diversity in a seemingly homogeneous environment, competing for the same set of resources. Many theories have been proposed to explain this coexistence despite likely competition, such as contrasted responses to temporal environmental variation. However, theory has developed at a faster pace than empirical evaluation using field data, which requires inferring drivers of community dynamics from observational time series. Here, we combine autoregressive models with a data set spanning more than 20 years of phytoplankton counts every two weeks, together with nutrients and physical variables. By comparing models dominated by nutrients or physical variables (hydrodynamics and climate), we first explore which abiotic...
Tipo: Text
Palavras-chave: Competition; Diatoms; Dinoflagellates; Hydrodynamics; Interactions; MAR; Mutualism; Network; Population dynamics; Seasonality; Time series.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00461/57257/59285.pdf

Seasonal and vertical variations of sinking particle fluxes in the West Caroline Basin
Provedor de dados: 5
Autores: Kawahata, H; Yamamuro, M; Ohta, H.
A sediment trap experiment was carried out in the West Caroline Basin, located in the equatorial western Pacific between influences of the Asian monsoon and the open ocean. Annual mass flux at the shallow trap at Site 1 was 57.10 g m(-2)yr(-1). Generally, the higher flux of organic matter was associated with higher activities of biogenic opal-producing and carbonate-producing plankton communities. In addition, as the organic matter content increases, the organic carbon/carbonate carbon ratio shows a tendency to increase. Carbonate-producing plankton was predominant during periods 1 and 3 (May to July and November to the beginning of December), which could be due to limited silica supply to the euphotic zone. On the other hand, surface sea water was more...
Tipo: Text
Palavras-chave: Variation saisonnière; Variation verticale; Flux de particules; Pacifique occidental; Cycle du carbone; Seasonality; Vertical variations; Sinking particle fluxes; Western Pacific; Carbon cycle.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43655/43219.pdf

Flux dynamics of planktic foraminiferal tests in the south-eastern Bay of Biscay (northeast Atlantic margin)
Provedor de dados: 5
Autores: Kuhnt, Tanja; Howa, Helene; Schmidt, Sabine; Marie, Louis; Schiebel, Ralf.
The temporal and water depth related dynamics of planktic foraminiferal fluxes in the south-eastern Bay of Biscay are discussed for a two year sampling period (June 2006-June 2008). Two sediment traps deployed at 800 m and 1700 m water depth at a mooring in 2000 m of water depth, were analyzed for the flux of planktic foraminiferal species &gt;150 mu m, in comparison with the total mass flux. Total flux of planktic foraminifera shows seasonal maxima in spring/early summer (&gt;2000 Ind.m(-2) d(-1)) and minima from late summer through winter (&lt;10 Ind.m(-2) d(-1)). The flux of planktic foraminiferal tests in the intermediate to deep water column at the inner Bay of Biscay comprises an intermittent and regionally variable signal of seasonal surface water...
Tipo: Text
Palavras-chave: Planktic foraminifera; Bay of Biscay; Sediment traps; Particulate mass flux; Pb-210; Seasonality; Lateral advection.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00125/23593/21785.pdf

Large-scale patterns of river inputs in southwestern Europe: seasonal and interannual variations and potential eutrophication effects at the coastal zone
Provedor de dados: 5
Autores: Romero, Estela; Garnier, Josette; Lassaletta, Luis; Billen, Gilles; Le Gendre, Romain; Riou, Philippe; Cugier, Philippe.
We provide data on nutrient export for 28 rivers in southwestern Europe and analyze long-term changes in the context of anthropogenic pressures and regulation policies. Special attention is given to seasonal variations, because the integrated annual values that are usually provided do not allow us to establish comparisons with seasonal phytoplankton dynamics. The eutrophication risk associated with river inputs is addressed by means of an indicator (Index of Coastal Eutrophication Potential, ICEP, Billen and Garnier, Mar Chem 106:148–160, 2007). An overview of the temporal evolution and the intra-annual variability of the ICEP is discussed for specific rivers and integrated coastal regions. The annual dynamics of the eutrophication indicator is analyzed to...
Tipo: Text
Palavras-chave: River inputs; Coastal zone; N:P:Si stoichiometry; Eutrophication; Seasonality; Europe.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00090/20152/17928.pdf

Flow structure and seasonalityin the Hebridean slope current
Provedor de dados: 5
Autores: Souza, Aj; Simpson, Jh; Harikrishnan, M; Malarkey, J.
The intensity, structure and variability of the slope current have been determined from 16 months of observations with Acoustic Doppler Current Profilers (ADCP) and conventional current meters on a cross-slope section at the Hebridean shelf edge during the Shelf Edge Study (SES) programme. After removal of the tidal signals, the mean flow over the upper slope is found to be closely parallel to the topography with speeds of . 20 cmEs.1. The flow extends down to a depth of 500 m and is predominantly barotropic, especially in winter when the flow is practically uniform between 350 m and the surface. In summer, there is a significant baroclinic component with a pronounced maximum in current at a depth of about 200 m but more than 80% of the kinetic energy is...
Tipo: Text
Palavras-chave: Slope current; Seasonality; Velocity structure.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00292/40275/38648.pdf

Interannual variability of the Mediterranean outflow observed in Espartel sill, western Strait of Gibraltar
Provedor de dados: 5
Autores: Garcia-lafuente, J.; Delgado, J.; Sanchez Roman, A.; Soto, J.; Carracedo, Lidia; Diaz Del Rio, G.
Four-year time series of observations in Espartel sill at the western part of the Strait of Gibraltar have been analyzed in order to investigate the variability of the Mediterranean outflow. It is assumed that the observed variability comes from the changing properties of the dense waters that are located at the maximum depth from where they can be uplifted in the upstream basin (Alboran Sea, inside the Mediterranean Sea) and evacuated through the strait. From this perspective, the following three mechanisms are investigated: (1) the replenishment of the deep basin by newly formed Western Mediterranean Deep Water that, depending on its density, can either uplift old resident waters or lay above them leaving in any case a cold signature in the temperature...
Tipo: Text
Palavras-chave: Mediterranean outflow; Alboran Sea gyres; Interannual variability; Strait of Gibraltar; Seasonality; WMDW.
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00629/74113/73544.pdf

Glacial North Atlantic: Sea-surface conditions reconstructed by GLAMAP 2000
Provedor de dados: 5
Autores: Pflaumann, U; Sarnthein, M; Chapman, M; D'Abreu, L; Funnell, B; Huels, M; Kiefer, T; Maslin, M; Schulz, H; Swallow, J; Van Kreveld, S; Vautravers, M; Vogelsang, E; Weinelt, M.
The response of the tropical ocean to global climate change and the extent of sea ice in the glacial nordic seas belong to the great controversies in paleoclimatology. Our new reconstruction of peak glacial sea surface temperatures (SSTs) in the Atlantic is based on census counts of planktic foraminifera, using the Maximum Similarity Technique Version 28 (SIMMAX-28) modern analog technique with 947 modern analog samples and 119 well-dated sediment cores. Our study compares two slightly different scenarios of the Last Glacial Maximum (LGM), the Environmental Processes of the Ice Age: Land, Oceans, Glaciers (EPILOG), and Glacial Atlantic Ocean Mapping (GLAMAP 2000) time slices. The comparison shows that the maximum LGM cooling in the Southern Hemisphere...
Tipo: Text
Palavras-chave: Last Glacial Maximum; Atlantic sea-surface temperatures; Seasonality; Sea ice cover; Glacial cooling near equator; Glacial upwelling intensity.
Ano: 2003
URL: https://archimer.ifremer.fr/doc/00225/33668/32070.pdf

Linking Danube River Activity to Alpine Ice-Sheet Fluctuations during the Last Glacial (ca. 33-17 ka BP): insights into the continental signature of Heinrich Stadials
Provedor de dados: 5
Autores: Martinez-lamas, Ruth; Toucanne, Samuel; Debret, Maxime; Riboulot, Vincent; Deloffre, Julien; Boissier, Audrey; Cheron, Sandrine; Pitel, Mathilde; Bayon, Germain; Giosan, Liviu; Soulet, Guillaume.
Offshore archives retrieved from marine/lacustrine environments receiving sediment from large river systems are valuable Quaternary continental records. In the present study, we reconstruct the Danube River activity at the end of the last glacial period based on sedimentological, mineralogical and geochemical analyses performed on long-piston cores from the north-west Black Sea margin. Our data suggest that the Danube River produced hyperpycnal floods throughout the ca. 33-17 ka period. Four main periods of enhanced Danube flood frequency, each of 1.5-3 kyr duration, are recorded at ca. 32.5 30.5 ka (equivalent to the first part of Heinrich Stadial HS 3), at ca. 29-27.5 ka (equivalent to Greenland Stadial 4), at ca. 25.3-23.8 ka (equivalent to HS 2) and at...
Tipo: Text
Palavras-chave: Danube river; Floods; Hyperpycnites; Alpine ice sheet; Heinrich stadials; Seasonality; Black sea.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00613/72556/71612.pdf

Evidence of a relationship between weight and total length of marine fish in the North-eastern Atlantic Ocean: physiological, spatial and temporal variations
Provedor de dados: 5
Autores: Mahe, Kelig; Bellamy, Elise; Delpech, Jean-paul; Lazard, Coline; Salaun, Michele; Verin, Yves; Coppin, Franck; Travers-trolet, Morgane.
Weight–Body Length relationships (WLR) of 45 fish species (37 Actinopterygii and eight Elasmobranchii) were investigated. A total of 31,167 individuals were caught and their biological parameters measured during the four quarters from 2013 to 2015, on five scientific surveys sampling the North-eastern Atlantic Ocean from the North Sea to the Bay of Biscay (ICES Divisions IVb, IVc, VIId, VIIe, VIIg, VIIh, VIIj, VIIIa and VIIIb). Among 45 tested species, all showed a significant correlation between total length (L) and total weight (W). The influence of sex on WLR was estimated for 39 species and presented a significant sexual dimorphism for 18 species. Condition factor (K) of females was always higher than for males. Moreover, a spatial effect on the WLR...
Tipo: Text
Palavras-chave: Weight-length relationship; Condition factor; Bay of Biscay; Celtic Sea; English Channel; North Sea; Sexual dimorphism; Seasonality.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00363/47418/47513.pdf

Contribution of benthic microalgae to the temporal variation in phytoplankton assemblages in a macrotidal system
Provedor de dados: 5
Autores: Hernandez Farinas, Tania; Ribeiro, Lourenco; Soudant, Dominique; Belin, Catherine; Bacher, Cedric; Lampert, Luis; Barille, Laurent.
Suspended marine benthic microalgae in the water column reflect the close relationship between the benthic and pelagic components of coastal ecosystems. In this study, a 12-year phytoplankton time-series was used to investigate the contribution of benthic microalgae to the pelagic system at a site along the French-Atlantic coast. Furthermore, all taxa identified were allocated into different growth forms in order to study their seasonal patterns. The highest contribution of benthic microalgae was observed during the winter period, reaching up to 60% of the carbon biomass in the water column. The haptobenthic growth form showed the highest contribution in terms of biomass, dominant in the fall-winter period when the turbidity and the river flow were high....
Tipo: Text
Palavras-chave: Co-inertia; Dynamic linear models; Epipelon; Epiphyton; Haptobenthos; Microphytobenthos growth forms; Seasonality; Tychoplankton.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00392/50345/51035.pdf

Construction et étude d'un modèle de réseau trophique de la vasière de Brouage (bassin de marennes Oléron, France). Prise en compte de la saisonnalité et des échanges physiques pour la synthèse constructive des connaissances sur une zone intertidale d'une région tempérée.
Provedor de dados: 5
Autores: Leguerrier, Dephine.
In order to better understand the functioning of the Brouage intertidal mudflat (Marennes- Oléron Basin, France), its carbon-based trophic web has been modelled and analyzed. The foodweb building is based on the 4 step method of Inverse Analysis: 1) conceive an a priori model as the graph of compartments (nodes) between which exist fluxes of material (vertices). These vertices are the unknowns for the problem; 2) gather all the existing knowledge about the ecosystem and translate it into linear equations and inequalities involving the fluxes; 3) complete this set of data by common knowledge on the behaviour of the compartments and translate it into inequalities, 4) solve the obtained linear system under the parsimony principle to find a unique solution...
Tipo: Text
Palavras-chave: Brouage Mudflat; Box Model; Seasonality; Dynamic Model; Static Model; Monte Carlo; Markov Chains; Network Analysis; Intertidal Mudflat; Food Web; Inverse Analysis; Vasière de Brouage; Modèle en boîtes; Saisonnalité; Modèle Dynamique; Modèle Statique; Monte Carlo; Chaînes de Markov; Analyse des Réseaux; Vasière Intertidale; Réseau Trophique; Analyse Inverse.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/these-2260.pdf

Growth and gonad development of the tropical black-lip pearl oyster, Pinctada margaritifera (L.), in the Gambier archipelago (French Polynesia)
Provedor de dados: 5
Autores: Le Moullac, Gilles; Tiapari, Jerome; Teissier, Hinano; Martinez, Elodie; Cochard, Jean-claude.
The growth and reproductive cycle of cultured black-lipped pearl oysters, Pinctada margaritifera (L.), were studied in the Gambier Islands (134°52' W, 23°07' S) from September 2002 to August 2003. Temperatures were recorded throughout the year, revealing seasonal temperature variations between 22.3 °C and 27.8 °C. The mean annual chlorophyll a value, as computed from satellite data, was 0.188 ± 0.075 µg L-1. To study growth and reproduction, 720 two-year-old individuals were ear hung on longlines suspended at a depth of 7 m. Samples were taken twice a month to obtain the following measurements: shell height; wet weight of flesh and total oyster; dry weight of adductor muscle, mantle and visceral mass; and glycogen content. Gonad development was also...
Tipo: Text
Palavras-chave: Pearl oyster; Pinctada margaritifera; Growth; Reproduction; Temperature; Chlorophyll; Seasonality; Gambier archipelago.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00040/15099/13570.pdf

Defining a pelagic typology of the eastern English Channel
Provedor de dados: 5
Autores: Delavenne, Juliette; Marchal, Paul; Vaz, Sandrine.
Classifying marine habitats is a growing research field and is of increasing interest to spatial planners and managers. Most studies have predominantly focused on the seabed to determine benthic habitat types, and only limited attention has been paid to the water column. Classification projects aim at identifying candidate management units for the application of various regional or national regulations such as the European Water Framework Directive. Here, we propose a seasonal classification of the water column in the eastern English Channel, which we validated with biological data. For the three tested compartments, phytoplankton, zooplankton and pelagic fishes, the validation results were satisfactory, with recall values (i.e. percentage of observations...
Tipo: Text
Palavras-chave: Eastern English Channel; Pelagic typology; Clustering analysis; Seasonality.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00125/23655/22689.pdf

Sea surface pCO2 variability and air-sea CO2 exchange in the coastal Sudanese Red Sea
Provedor de dados: 5
Autores: Ali, Elsheikh B.; Skjelvan, Ingunn; Omar, Abdirahman M.; Olsen, Are; De Lange, Tor E.; Johannessen, Truls; Elageed, Salma.
The dynamics of sea surface pCO2 () and air-sea CO2 exchange of the Sudanese coastal Red Sea has for the first time been studied over a full annual cycle (October 2014 - October 2015) based on semi-continuous measurements from moored autonomous sensors. showed a seasonal amplitude of approximately 70 atm, overlaid by a high frequency (3-4 days) signal of around 10 atm. The highest values, of about 440 atm occurred during summer and fall, while the lowest values of about 370 atm occurred during winter. The monthly change was primarily driven by temperature, i.e., heating and cooling of the water surface. Additionally, Dissolved Inorganic Carbon (DIC) and Total Alkalinity (AT) contributed significantly to the observed change in as a consequence of...
Tipo: Text
Palavras-chave: Sea surface pCO2; CO2 flux; Time series; Coastal Red Sea; Seasonality.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00690/80252/83332.pdf

Atlantic forcing of Western Mediterranean winter rain minima during the last 12,000 years
Provedor de dados: 5
Autores: Zielhofer, Christoph; Fletcher, William J.; Mischke, Steffen; De Batist, Marc; Campbell, Jennifer F. E.; Joannin, Sebastien; Tjallingii, Rik; El Hamouti, Najib; Junginger, Annett; Stele, Andreas; Bussmann, Jens; Schneider, Birgit; Lauer, Tobias; Spitzer, Katrin; Strupler, Michael; Brachert, Thomas; Mikdad, Abdeslam.
The limited availability of high-resolution continuous archives, insufficient chronological control, and complex hydro-climatic forcing mechanisms lead to many uncertainties in palaeo-hydrological reconstructions for the Western Mediterranean. In this study we present a newly recovered 19.63 m long core from Lake Sidi Ali in the North African Middle Atlas, a transition zone of Atlantic, Western Mediterranean and Saharan air mass trajectories. With a multi-proxy approach based on magnetic susceptibility, carbonate and total organic C content: core-scanning and quantitative XRF, stable isotopes of ostracod shells, charcoal counts, Cedrus pollen abundance, and a first set of diatom data, we reconstruct Western Mediterranean hydro-climatic variability,...
Tipo: Text
Palavras-chave: Holocene; Younger Dryas; Winter rain minima; Atlantic forcing; Western Mediterranean; North Atlantic Oscillation (NAO); Seasonality; Solar forcing; Lake sediments; Middle Atlas; Morocco.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00420/53188/55016.pdf

A latitudinal gradient of seasonal temperature variation recorded in oyster shells from the coastal waters of France and The Netherlands
Provedor de dados: 5
Autores: Lartaud, Franck; Emmanuel, Laurent; De Rafelis, Marc; Ropert, Michel; Labourdette, Nathalie; Richardson, Christopher A.; Renard, Maurice.
Cathodoluminescence (CL) microscopy of the foliated calcite shell hinge sections of live-collected oyster Crassostrea gigas collected at seven locations along a latitudinal gradient from the Netherlands in the North Sea to the Atlantic coast of France, revealed variations in luminescence that were attributable to seasonal variations in calcification of the hinge. Photomicrographs of hinge sections and luminescence profiles were analyzed to define a micro-sampling strategy that was adopted to drill the hinge samples to determine their isotopic composition. Reconstructed seasonal seawater temperatures determined from the stable oxygen isotope (delta O-18) composition along growth profiles from 32 oyster shell hinges showed distinct seasonal isotopic cycles...
Tipo: Text
Palavras-chave: Seasonality; Palaeotemperatures; Stable isotopes; Cathodoluminescence; Crassostrea gigas; Mollusk shells.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/2010/publication-7296.pdf

Inferring the annual, seasonal, and spatial distributions of marine species from complementary research and commercial vessels’ catch rates
Provedor de dados: 5
Autores: Bourdaud, Pierre; Travers-trolet, Morgane; Vermard, Youen; Cormon, Xochitl; Marchal, Paul.
The objective of this study is to analyse at fine scale the annual, seasonal and spatial distributions of several species in the Eastern English Channel (EEC). On the one hand, data obtained from scientific surveys are not available all year through, but are considered to provide consistent yearly and spatially resolved abundance indices. On the other hand, on-board commercial data do cover the whole year, but generally provide a biased perception of stock abundance. The combination of scientific and commercial catches per unit of effort (CPUEs), standardized using a delta-generalized linear model, allowed to infer spatial and monthly dynamics of fish distributions in the EEC, which could be compared with previous knowledge on their life cycles....
Tipo: Text
Palavras-chave: Commercial data; Eastern English Channel; Seasonality; Spatial distribution; Survey data.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00387/49805/50385.pdf

Sea‐surface signature of internal tides
Provedor de dados: 5
Autores: Lahaye, Noe; Gula, Jonathan; Roullet, Guillaume.
The upper ocean is energetic at scales below the Rossby deformation radius owing to the existence of internal waves and submesoscale fronts and vortices. These contribute significantly to energy dissipation, tracer mixing and exchanges between the ocean surface layer, the ocean interior, and the atmospheric boundary layer. Internal waves and submesoscale motions both undergo strong spatial and seasonal variations, driven by different mechanisms. Here, we investigate the sea surface signature of internal waves and its seasonality using linear wave theory and a high‐resolution realistic simulation. In summer, internal waves are greatly amplified near the surface mostly due to a thin mixed layer bounded by a seasonal pycnocline. This surface amplification is...
Tipo: Text
Palavras-chave: Internal tide; Submesosacle dynamics; Seasonality.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00486/59746/62847.pdf

Coastal upwelling in the eastern Gulf of California
Provedor de dados: 5
Autores: Lluch-cota, Salvador Emilio.
Understanding and quantifying upwelling is of great importance for marine resource management. Direct measurement of this process is extremely difficult and observed time-series do not exist. However, proxies are commonly derived from different data; most commonly wind-derived. A local wind-derived coastal upwelling index (CUI) is reported for the period 1970-1996 and is considered representative for the eastern central Gulf of California, an important fishing area where no proxies exist. The index is well related to pigment concentration distribution, surface water temperature, and population dynamics of important fish resources over the seasonal time-scale. There is a biological response to ENSO activity not reflected by this index, indicating that...
Tipo: Text
Palavras-chave: Upwelling; Golfe de Californie; Variabilité saisonnière; Changement climatique; Upwelling; Gulf of California; Seasonality; Climate change.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00323/43381/42831.pdf

Follicular-Stromal Interaction in Mare Ovary During the Reproductive Cycle
Provedor de dados: 77
Autores: Smok S,Carolina; Rojas R,Mariana.
Ovogenesis and foliculogenesis in the mare differ from other farm animals and therefore, gamete manipulation, in vitro fertilization and embryo transfer have been very difficult. The histologic traits of ovaries from 12 mares, in estrus and diestrus were studied. Number and size of follicules and corpora lutea were recorded. The ovarian stroma was evaluated using the pricosirius technique for collagen. A simple morphometric analysis was done using computerized scanner programs. During late estrus, one dominant follicle (46 ± 4mm) is seen. The surrounding stroma contains collagen I and III. By the end of the estrus, one hemorrhagic follicle is seen, plus one or two small follicle (2 mm in size). In early diestrus there is a corpus luteum (43-60 mm) and some...
Tipo: Journal article
Palavras-chave: Follicle; Stroma; Mare ovary; Seasonality.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300007

Fauna and stratification of male orchid bees (Hymenoptera: Apidae) and their preference for odor baits in a forest fragment
Provedor de dados: 82
Autores: Ferreira,MG; Pinho,OC de; Balestieri,JBP; Faccenda,O.
This is a study of the population fluctuation of euglossine species, as well as their preferences for scent baits (cineole, eugenol, vanillin and methyl salicylate) in two forest strata (canopy and understory) at the Reserva Florestal do Azulão, a forest fragment located in the municipality of Dourados, MS, Brazil (22°12'S, 54°55'W). We collected a total of 529 males from four genera and eight species. Diversity and equitability for both strata (understory: H' = 1.195 and J' = 0.6139; canopy: H' = 1.193 and J' = 0.6131) did not show a significant difference and a high similarity index was found (P = 87.5%). On the other hand, abundance was substantially higher in the canopy (n = 358) than in the understory (n = 171). From the scents used, eugenol attracted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diversity; Equitability; Floral reward; Richness; Seasonality.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000600002

Seasonal fecundity and body size in Chrysomya megacephala (Fabricius) (Diptera: Calliphoridae)
Provedor de dados: 82
Autores: Reigada,Carolina; Godoy,Wesley A.C.
In this study the seasonal variation of fecundity, wing and tibia size was investigated in natural populations of Chrysomya megacephala (Fabricius) aiming at determining the variations in life history of the species as a function of seasonality. A relative constant temporal trajectory was found for fecundity, wing and tibia size over twelve months. Strong positive correlations between wing size and temperature, tibia size and temperature and between wing and tibia sizes were observed. The implications of the results for population dynamics of C. megacephala were discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Blowfly; Population dynamics; Muscomorpha; Seasonality; Bionomics.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2005000200003

Diversity of galling arthropods and host plants in a subtropical forest of Porto Alegre, southern Brazil
Provedor de dados: 82
Autores: Dalbem,Ricardo V.; Mendonça Jr.,Milton de S.
Many hypotheses have been proposed to explain diversity patterns of galling insects. However, there are contradictory evidences on the evolutionary and ecological factors responsible for the trends. Furthermore, questions such as arthropod seasonality, sampling sufficiency and sampling team experience have been almost ignored. This study records galling arthropod diversity while paying attention to these questions. Seasonal sampling of galling arthropods and host plants were conducted in a humid subtropical forest of southern Brazil. Four transects were sampled twice per season, with two persons searching the vegetation for galls during 1h30min. After 96h.persons of sampling, 130 gall morphotypes on 84 species of host plants were recorded. An analysis of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphotype; Sampler; Environmental heterogeneity; Seasonality.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2006000500007

Seasonal Abundance and Species Composition of Flower-Visiting Flies
Provedor de dados: 82
Autores: SOUZA-SILVA,MARCONI; FONTENELLE,JULIO C.R.; MARTINS,ROGÉRIO P.
The species of flies that visit flowers to feed were recorded, at the Ecological Station of the Federal University of Minas Gerais (UFMG). Asteraceae, Rhamnaceae, and Boraginaceae were the most visited families. Asteraceae was the richest family and the most visited by flies families and species. The highest diversity of visiting flies was on Baccharis trinervis (Lam.) (H'=1.86). The most diverse families of Diptera were Syrphidae (H'= 2.07) and Bombyliidae (H'= 1.52). The syrphids Ornidia obesa (L.) and Palpada furcata (Wied.) were the most abundant species amongst visitors. Despite the total abundance of Diptera was significantly higher in the rainy season, when a higher number of plants were blooming, there were more families of visitors during the dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Diptera; Flower visitors insect; Richness; Seasonality.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2001000300002

Composição, abundância e índice de infestação de espécies de formigas em um hospital materno-infantil de Palmas, TO
Provedor de dados: 82
Autores: Bragança,Marcos A L; Lima,Jefferson D.
This first survey of the ant fauna in a children's hospital in the city of Palmas, state of Tocantins, compares species composition, abundance and infestation rate of ants between rainy and dry seasons, day and night periods, and among 15 hospital sectors. Forty-eight collections, being 12 diurnal and 12 nocturnal in each season using five attractive baits distributed per sector, maintained for 3h per sampling. A total of 34,309 ants were collected, distributed in 12 species: Acromyrmex sp., Brachymyrmex sp., Camponotus spp. (four morphospecies), Dorymyrmex sp., Tetramorium sp., Solenopsis globularia (Creighton), Solenopsis saevissima Smith, Tapinoma melanocephalum (Fabricius) and Paratrechina longicornis (Latreille). The hospital presented an average...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nosocomial infection; Diurnal activity; Nocturnal activity; Seasonality; Hospital sector.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000100017

The influence of flood pulse on fish communities of floodplain canals in the Middle Solimões River, Brazil
Provedor de dados: 83
Autores: Sousa,Raniere G. C.; Freitas,Carlos E. de C.
The functioning of large river systems with adjacent floodplains is strongly influenced by the flood pulse. This phenomenon is the main structuring force for the biota, including fish communities that use floodplain environments for spawning, feeding, nursery and refuge. In floodplains and in the entire basin, the volume of water controls internal flows. During rising water, the high discharge of the river acts as a natural barrier to the canals that connect floodplain lakes and the Solimões River, because the water flows from river to lake. During the dry period, there is a reduction of discharge and the water flow is reversed or stationary. These canals are environments with distinct ecological characteristics such as differentiated limnology and water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Seasonality; Freshwater fish.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000200013

Feeding ecology of Phalloceros anisophallos (Osteichthyes: Cyprinodontiformes) from Andorinha Stream, Ilha Grande, Brazil
Provedor de dados: 83
Autores: Mazzoni,Rosana; Araújo,Raphaella Rangel da Silva; Santos,Gardênia Carolina Tosta dos; Iglesias-Rios,Ricardo.
In the present work, we determined the relative importance of allochthonous and autochthonous food items as well as seasonal and ontogenetic variation in the feeding habits of Phalloceros anisophallos from córrego Andorinha, Ilha Grande. Quantitative analysis, based on alimentary index (IAi) and food volume (Vo), revealed that P. anisophallos fed on detritus, autochthonous algae (diatoms, unicellular and filamentous Chlorophyceae algae), autochthonous animals (aquatic insect larvae: Trichoptera, Chironomidae and other Diptera) and allochthonous animals (terrestrial insects: Hymenoptera). Ontogenetic variations were recorded for the consumption of each food category. Adults used a larger amount of algae and detritus, and juveniles used a higher amount of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Poeciliidae; Atlantic Rain Forest; Coastal stream; Ontogeny; Seasonality.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000100021

Feeding dynamics of Cichla kelberi Kullander &amp;amp; Ferreira, 2006 introduced into an artificial lake in southeastern Brazil
Provedor de dados: 83
Autores: Villares Junior,Gilberto Aparecido; Gomiero,Leandro Muller.
The objective of this study was to characterize the seasonally of the diet of Cichla kelberi in an artificial lake in Leme-SP, determining the food items and their relation to the sex and gonadal maturity of the fish sampled. The diet of C. kelberi presents a dynamic in three different periods: winter months were characterized by low feeding activity and a high concentration of undetermined fish; increase in feeding activity occurred in the spring, with Tilapia sp. being the dominant food item; and a high rate of cannibalism was observed in the summer and early fall. The plasticity in the composition of the diet was marked by quantity of prey available during the different periods of the year, and the reproductive period.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Seasonality; Cannibalism; Predation; Competition.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000400011

Movements through a fish ladder: temporal patterns and motivations to move upstream
Provedor de dados: 83
Autores: Agostinho,Carlos Sérgio; Pereira,Celiana Ribeiro; Oliveira,Rafael José de; Freitas,Iriene Siqueira; Marques,Elineide Eugênio.
Fish passages are constructed with the aim of reestablishing connectivity between critical habitats, in order to sustain those species that move over a large area during their lives. The upstream movements of most of the known migratory species are made for purposes of reproduction (adults) or dispersal (juveniles). The present study was conducted at the ladder constructed at Lajeado Dam (Luis Eduardo Magalhães Hydroelectric Power), on the Tocantins River. The objective was to assess whether there is a temporal pattern in the abundance of fish below the dam and in the ladder, that correlates with their breeding seasons. Additionally, it was examined whether reproduction is the predominant motivation of the shoals of fish that ascend the ladder. Samples...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish migration; Fish conservation; Biodiversity; Reservoir; Seasonality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000200010

Compositional change in fish assemblages along the Andean piedmont - Llanos floodplain gradient of the río Portuguesa, Venezuela
Provedor de dados: 83
Autores: Hoeinghaus,David J.; Winemiller,Kirk O.; Taphorn,Donald C.
The Llanos is an extensive area of savannas and floodplains in central and western Venezuela that encompasses a gradual elevation gradient from the río Orinoco to the foothills of the Andean piedmont. The río Portuguesa is one of the major rivers in this region that until recently had escaped major anthropogenic impacts and still maintains substantial seasonal fish migrations. However, little work has been conducted on fish ecology in this river. The present study analyzes museum collections sampled at 28 locations along the longitudinal gradient of the río Portuguesa to assess similarity of species composition from the foothills of the Andean piedmont to the lowland llanos floodplain. The standardized samples used in this analysis contained greater than...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Longitudinal gradient; Migration; Ribazón; Seasonality; Turnover.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252004000200005

Riffle and pool fish communities in a large stream of southeastern Brazil
Provedor de dados: 83
Autores: Langeani,Francisco; Casatti,Lilian; Gameiro,Helena Seixas; Carmo,André Bellucco do; Rossa-Feres,Denise de Cerqueira.
The structure of the fish communities of a pool and a rapid in the ribeirão Santa Bárbara is described. This stream of 5th order is a direct tributary of the rio Tietê in the system of the upper rio Paraná. Thirty three species, from nine families and three orders, were referred in the two mesohabitats: the pool with 31 species, and the rapid with 18. Orders Characiformes, Siluriformes, and Perciformes presented the greatest number of species in the two mesohabitats. The families Characidae and Loricariidae were the most specious, followed by Cichlidae in the pool, and by Parodontidae in the rapid. Most species were accidental, 17 in the pool, and 10 in the rapid, and only six were constant in the two mesohabitats. The greatest diversity and evenness...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seasonality; Spatial distribution; Upper rio Paraná system; Niche breadth; Diversity; Adventitious streams.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000200009

Hydropeaking effects of on the diet of a Neotropical fish community
Provedor de dados: 83
Autores: Gandini,Cíntia Veloso; Sampaio,Francisco Alexandre Costa; Pompeu,Paulo Santos.
The impact of hydropeaking by dams is still poorly understood. Studying the diet of fish subjected to that variation allows us to test the following hypotheses: 1) seasonal and daily changes in river flow, causes changes in the use of the feeding resources; 2) species presenting larger differences in diet between seasons will be those with larger diet changes due to hydropeaking; 3) hydropeaking effects will be more evident in species feeding on items that can be more affected by variable flows. Fish diet collected from the Grande River, downstream from Itutinga Dam, in January and July 2010, was characterized by the feeding index (IA). NMDS, ANOSIM and SIMPER analyses were used to compare the diets under different hydropeaking and season. Relationship...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Differences in diet; Flow fluctuation; Rio Grande fish; Invertivorous; Seasonality.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000400795

Reproductive biology of the cockfish, Callorhinchus callorynchus (Chondrichthyes: Callorhinchidae), in coastal waters of the northern Argentinean Sea
Provedor de dados: 83
Autores: Chierichetti,Melisa A.; Scenna,Lorena B.; Giácomo,Edgardo E. Di; Ondarza,Paola M.; Figueroa,Daniel E.; Miglioranza,Karina S. B.
ABSTRACT The cockfish, Callorhinchus callorynchus, is a widely distributed holocephalan in the south-western Atlantic and an important resource for Argentinean fisheries. The reproductive characteristics of this species were studied in northern Argentinean coastal waters, where specimens arrive seasonally (winter-spring). Sexual dimorphism in maximum precaudal length (PCL) and total body mass (TM) was found, being females (PCL=630 mm; TM=3330 g; n=167) larger and heavier than males (PCL=482 mm; TM=1630 g; n=19). Maturity size for females was 466.22 mm PCL, representing 74% PCL of the largest female sampled. The mean number of ovarian follicles was 8.37 (± 4.84). The highest values of ovarian follicles diameter, gonadosomatic and oviducalsomatic indices...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Holocephalans; Maturity; Ovarian fecundity; Seasonality; South-western Atlantic.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200203

Trophic strategy of Atlantirivulus riograndensis (Cyprinodontiformes: Rivulidae), a non-annual rivulid threatened by extinction, in a perennial environment, Brazil)
Provedor de dados: 83
Autores: Cavalheiro,Laísa Wociechoski; Fialho,Clarice Bernhardt.
ABSTRACT Rivulidae includes non-annual fish of perennial habitats and annual fish of temporary wetlands. The objective of this research was to investigate the trophic strategy of Atlantirivulus riograndensis in a perennial environment. Sampling occurred in an environmental conservation unit in the Pampa biome, Brazil. Quantification of the diet followed the volumetric method. Consumption of autochthonous material as the main food source of the species followed the pattern of Rivulidae. Species is zooplanktonic when young. Food spectrum is broadened and insectivorousness increases with ontogeny, revealing a specialist trend in the feeding strategy of A. riograndensis. The most diverse feeding occurs in the spring and summer seasons in which the presence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Autochthonous resources; Ontogeny; Seasonality; Specialist; Trophic pattern.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000100223

Effects of flood regime on the diet of Triportheus curtus (Garman, 1890) in an Amazonian floodplain lake
Provedor de dados: 83
Autores: Pereira,Jardely de Oliveira; Silva,Maralina Torres da; Vieira,Lisandro Juno Soares; Fugi,Rosemara.
We analyzed the diet of Triportheus curtus in Lake Amapá on the Acre River (AC - Brazil), during three distinct phases of the hydrological cycle (pre-flooding, flooding, and post-flooding stages). The flooding occurred between January and June of 2009. Samples were collected monthly from October 2008 through September 2009. After collection (at 19:00, 01:00, 07:00, and 13:00 hs) and taxonomic identification, fish were eviscerated and their stomachs preserved in a 4% formalin solution for later analysis. The diet was evaluated by the Index of Relative Importance (IRI), and temporal variations (pre-flooding, flooding, and post-flooding) in the diet were summarized by an ordination technique (DCA). The diet of T. curtus was comprised of several orders of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acre River; Feeding plasticity; Opportunist; Seasonality; Triportheinae.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300015

Temporal variation in fish composition and abundance in a perennial tributary of the rio Paraguaçu, a little-known drainage in the Brazilian semi-arid region
Provedor de dados: 83
Autores: Santos,Alexandre Clistenes de A.; Caramaschi,Érica P.
The rio Santo Antônio is a perennial lowland stream in the Brazilian semi-arid region, and is the main tributary of the upper rio Paraguaçu, an important drainage of the Chapada Diamantina. The temporal variation of the fish composition and abundance in a stretch of the middle course of the river was evaluated. Sampling was carried out monthly between August 1998 and July 1999, using standardized gear and techniques. Data on water and air temperature, water transparency, maximum and mean depth, width and area of the channel, and flow were recorded on each fish sampling occasion. Univariate and multivariate statistical analyses were employed in order to detect significant temporal differences in environmental parameters and fish abundance. Temperature,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chapada Diamantina; Ichthyofauna; Richness; Seasonality.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000100014

Stability and spatio-temporal structure in fish assemblages of two floodplain lagoons of the lower Orinoco River
Provedor de dados: 83
Autores: González,Nirson; Lasso,Carlos; Rosales,Judith.
Fish assemblage structure and variability were analyzed in two floodplain lagoons (Las Arhuacas and Los Cardonales) along the lower Orinoco over a hydrological cycle. Every three months during continuous three-day sampling, experimental gill nets (5 to 12.5 cm of mesh opening) and 1 mm-mesh seine nets were utilized according to the types of habitats presents. A total of 133 fish species were found in Las Arhuacas and 95 species in Cardonales. Fifty five and 17 species were exclusive to Las Arhuacas and Los Cardonales respectively, and 77 were common to both lagoons. In Las Arhuacas, the most speciesrich orders were Characiformes, Siluriformes, Perciformes and Gymnotiformes and in Los Cardonales, the most species-rich orders were Characiformes,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical; Freshwater; Communities; Seasonality; Venezuela.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400022

Fish passage post-construction issues: analysis of distribution, attraction and passage efficiency metrics at the Baguari Dam fish ladder to approach the problem
Provedor de dados: 83
Autores: Silva,Luiz Gustavo Martins da; Nogueira,Lorena Bettinelli; Maia,Bruno Pereira; Resende,Lucas Borges de.
Fish passages are considered the oldest management tool used to minimize the impact of blocking fish migratory routes by hydroelectric power plants. However, fish passages are being installed without specific criteria in Brazil, with severe consequences to the conservation of the local fish fauna. Therefore, basic data gathered for fish passages already constructed could contribute to define operational rules, in addition to offer subsidies to decision-making and design of future facilities. Thus, the fish ladder of Baguari Dam was evaluated regarding temporal distribution, attraction, and ascension of the local fish fauna. A total of 20 fish samples were conducted immediately downstream of the dam and inside the fish ladder, from January 2010 to June...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fishway; Migratory species; Operational rule; Seasonality; Vertical-slot.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000400008

Note sur les temps de recherches journaliers maximum des senneurs intertropicaux.
Provedor de dados: 20
Autores: Fonteneau, A.
This document present the maximum daily duration of searching time by the purse seiners in intertropical areas. The daily duration of daylight varies according the latitude and season, and searching for tuna schools can be conducted only during this time (e.g. between the times of sunrise and of sunset). This maximum daily searching time should be routinely used and should preferably replace the constant 13 or 12 hours of standard daily searching time presently used for French and Spanish purse seiners in the Indian and Atlantic Oceans.
Tipo: Proceedings Paper
Palavras-chave: Purse seiners; Tuna fisheries; Seasonality.
Ano: 1998
URL: http://hdl.handle.net/1834/63

Some Aspects of the Reproductive Biology of Kapenta, Limnothrissa miodon (Boulenger 1906) in the Cahora Bassa Reservoir, Mozambique
Provedor de dados: 20
Autores: Mafuca, J.
The reproductive biology of the Kapenta (Limnothrissa miodon), that supports the main commercial fishery in Lake Cahora Bassa (Mozambique) was investigated using monthly samples collected during 2003 and2004. This species was initially introduced in Lake Kariba in 1967/68 with the objective of filling up the pelagic environment that was created with dam closure. The fish is believed to have been able to negotiate the Kariba dam wall and became established in Cahora Bassa, some 250 km downstream, as well. The reproductive biology of Kapenta is known from Lake Tanganyika, where it is indigenous, and from Kariba,but no research has been performed, so far, in Cahora Bassa. Since many important biological attributes may vary from place to place, depending on...
Tipo: Journal Contribution
Palavras-chave: Seasonality; Reproduction (biology); Sardine fisheries.
Ano: 2011
URL: http://hdl.handle.net/1834/5140

Bacterioplancton en Bahía Gaira, Mar caribe (Colombia): comparación de la variabilidad en abundancia y biomasa bacteriana durante diferentes períodos
Provedor de dados: 20
Autores: Barragán-G., R.G.; Canosa, A.; Niño, J.P.
Se estimaron abundancia, biomasa, biovolumen y forma del bacterioplancton en tres estaciones de la bahía de Gaira (costa Caribe colombiana) en los períodos definidos para este estudio como: "lluvioso" (julio, agosto; 2003), "transición" (abril, octubre; 2004) y "seco" (febrero, marzo; 2004). Las meustras del bacterioplancton fueron tomadas a 0.5 y 42 m de profundidad, filtradas sobre filtros de policarbonato de 0.22 μm y cuantificadas utilizando microscopía de epifluorescencia con naranja de acridina y análisis de imagen. La abundancia bacteriana varió entre 1.3 x 105-2.9 x 106 células mL-1 en el período lluvioso, 8.8 x 104-2.2 x 106 células mL-1 en el período de transición y 6.7 x 104-3.9 x 105 células mL-1 en el período seco, la abundancia promedio fue...
Tipo: Journal Contribution
Palavras-chave: Biomass; Seasonality; Biomass; Seasonality; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_34117.
Ano: 2009
URL: http://hdl.handle.net/1834/3594

Aporte e decomposição de serapilheira em Floresta Estacional Decidual na região do Alto Uruguai, RS
Provedor de dados: 190
Autores: Turchetto, Felipe; Fortes, Fabiano de Oliveira.
O presente estudo teve por objetivo analisar e descrever a dinâmica sazonal da deposição e decomposição de serapilheira na Floresta Estacional Decidual da região do Médio Alto Uruguai, RS. Para a determinação da deposição de serapilheira foram instalados 20 coletores de 1 m2 em uma área de um hectare, sendo realizadas avaliações mensais. Para a amostra da serapilheira acumulada nas estações sazonais, foram coletadas 20 amostras aleatórias em molduras de 25 cm x 25 cm. O material coletado foi identificado e separado nas frações: folhas, galhos e miscelânea. Após a estratificação, as amostras foram secas em estufa a 70 oC e pesadas. A deposição anual de serapilheira foi estimada em 7,14 t.ha-1, sendo composta por 58,54% de folhas, 28,69% de galhos e 12,77%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Recursos Florestais; Engenharia Florestal; Ecologia Mineralização; Sazonalidade; Decomposição Mineralization; Seasonality; Decomposition.
Ano: 2014
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/735

Orchid bees (Hymenoptera, Apidae, Euglossini) are seasonal in Seasonal Semideciduous Forest fragments, southern Brazil
Provedor de dados: 84
Autores: Margatto,Cleiton; Berno,Vinicius Ortega; Gonçalves,Rodrigo Barbosa; Faria,Luiz Roberto Ribeiro.
Abstract Seasonal fluctuations in the abundance of orchid bees have already been reported. The variations in population dynamics may be expected to occur in more predictable and pronounced manners in environments with a clear distinction between rainy and dry seasons, where climatic variables are regarded to be good predictors of populational patterns. The main goal of this paper is to investigate the seasonality of males of orchid bees in fragments of Seasonal Semideciduous Forest in southern Brazil. Data comprise bait samples from five one-year periods on four forest fragments. The seasonality of species abundance was tested with circular statistics. Results suggest two phenological patterns, one for Eufriesea violacea (Blanchard), Eulaema nigrita...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annual cycles; Insect; Life-cycle; Neotropical; Seasonality.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492019000100207

Geographical and seasonal distributions of the seedeaters Sporophila bouvreuil and Sporophila pileata (aves: Emberizidae)
Provedor de dados: 84
Autores: Machado,Érika; Silveira,Luís Fábio.
Many species in the genus Sporophila are migratory. Migration patterns, while poorly studied, may be influenced by seed production which can be very seasonal in some regions. The distribution of S. bouvreuil extends from the Amazon and Suriname south through a large part of the open regions of Brazil. Sporophila pileata, on the other hand, is found in southeastern and southern Brazil as well as Argentina and Paraguay. Both of these species migrate, but their movement patterns are poorly known. To better understand the geographical and the seasonal distributions of S. bouvreuil and S. pileata, we grouped the records into two categories: the breeding season (September to March) and the putative migration season (April to August). We found two areas of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aves; Sporophila pileata; Sporophila bouvreuil; Migration; Seasonality.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492010003200001

Natural diet of Ocypode quadrata (Fabricius, 1787) (Crustacea, Decapoda, Brachyura) from the Northern Coast of São Paulo, Brazil
Provedor de dados: 84
Autores: Gomes,Tassia Turini; Gheler-Costa,Carla; Rinaldi,Caroline Anacleto; Santana,William.
Abstract Decapod crustaceans have a wide variety of feeding habits, alternating among herbivory, predation, saprophagy, and filtration. The occupation of various trophic positions in the food web is a key feature in the evolution of the group. Thus, we analyzed the natural diet of the crab Ocypode quadrata (Fabricius, 1787), commonly known as the ghost crab and typically found on sandy beaches. The crabs were collected in the region of Ubatuba, between July 2016 and May 2017. The individuals were dissected in the laboratory, and each stomach was weighed and visually assessed in relation to the degree of repletion. After identification and classification, the items found were grouped for the analysis. In analyzing the stomach contents of Ocypode quadrata,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ghost crab; Natural diet; Ocypodidae; Seasonality; Trophic ecology.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492019000100257

Microbial communities in Cerrado soils under native vegetation subjected to prescribed fire and under pasture
Provedor de dados: 86
Autores: Viana,Laura Tillmann; Bustamante,Mercedes Maria da Cunha; Molina,Marirosa; Pinto,Alexandre de Siqueira; Kisselle,Keith; Zepp,Richard; Burke,Roger A.
The objective of this work was to evaluate the effects of fire regimes and vegetation cover on the structure and dynamics of soil microbial communities, through phospholipid fatty acid (PLFA) analysis. Comparisons were made between native areas with different woody covers ("cerrado stricto sensu" and "campo sujo"), under different fire regimes, and a 20-year-old active palisadegrass pasture in the Central Plateau of Brazil. Microbial biomass was higher in the native plots than in the pasture, and the highest monthly values were observed during the rainy season in the native plots. No significant differences were observed between fire regimes or between communities from the two native vegetation types. However, the principal component (PC) analysis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Land use; Microbial diversity; PLFA; Savannas; Seasonality.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011001200012

Metal trace elements in mussels in Urubuqueçaba Island, Santos Bay, Brazil
Provedor de dados: 86
Autores: Campolim,Marcos Bührer; Henriques,Marcelo Barbosa; Petesse,Maria Letizia; Rezende,Karina Fernandes Oliveira; Barbieri,Edison.
Abstract: The objective of this work was to verify the existence of bioaccumulation in mussels of the species Perna perna, by determining the concentration of metal trace elements, in Urubuqueçaba Island, Santos Bay, Santos, SP, Brazil. Mussels were collected in natural banks and rocky shores, and sampling took place from April 2010 to June 2011. The concentration of the trace metal elements - aluminum, cadmium, cromium, copper, iron, manganese, nickel, lead, and zinc - was determined according to mussel sex, length, and seasonality classes, in a flame atomic absorption spectrometer. Statistical analyses were applied to the results with the use of the software PAST, with parametric and nonparametric approaches, at 5% probability. In the summer, mussels...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Perna perna; Bivalve mollusks; Bioaccumulation; Seasonality.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001201131

SAZONALIDADE DA OFERTA DE PRODUTOS HORTÍCOLAS: O MERCADO DE BERINJELA
Provedor de dados: 31
Autores: Anefalos,   Lilian Cristina; Moreira,   Silvia Rocha; Cipolli,   Katia Maria Vieira Avelar Bittencourt; Turco,   Patricia Helena Nogueira; Tavares,   Paulo Eduardo Da Rocha.
O objetivo deste trabalho foi analisar o mercado de berinjela no período de 2001 a 2006 para estudar a evolução dos índices sazonais de volume e preço comercializados nos principais entrepostos de São Paulo e Minas Gerais. Para isso foram utilizadas séries históricas mensais de preços e volumes comercializados para se determinar seu padrão sazonal anual, a partir do método da média geométrica móvel centralizada. No caso da berinjela, verificou-se elevação da oferta do produto a partir de agosto e setembro, com conseqüente redução nos preços praticados nos entrepostos. Com a aplicação de novas tecnologias, pode ocorrer oferta de produtos de melhor qualidade, influenciando decisivamente a sazonalidade de preços no mercado...
Tipo: Conference Paper or Presentation
Palavras-chave: Hortaliça; Sazonalidade; Entreposto; Produto fitoterápico; Vegetable; Seasonality; Mart; Fitoterapeutic product; Crop Production/Industries.
Ano: 2008
URL: http://purl.umn.edu/113377

Are Hospitals Seasonally Inefficient? Evidence from Washington State Hospitals
Provedor de dados: 31
Autores: Friesner,   Daniel L.; McPherson,   Matthew Q.; Rosenman,   Robert.
Efficiency measurement has been one of the most extensively explored areas of health services research over the past two decades. Despite this attention, few studies have examined whether a provider’s efficiency varies on a monthly, quarterly or other, sub-annual basis. This paper presents an empirical study that looks for evidence of seasonal inefficiency. Using a quarterly panel of general, acute-care hospitals from Washington State, we find that hospital efficiency does vary over time; however, the nature of this dynamic inefficiency depends on the type of efficiency being measured. Our results suggest that technical and cost efficiency vary by quarter. Allocative and scale efficiency also vary on a quarterly basis, but only if the data are jointly...
Tipo: Working or Discussion Paper
Palavras-chave: Seasonality; Efficiency; Hospitals; Data envelopment analysis; Health Economics and Policy.
Ano: 2006
URL: http://purl.umn.edu/12957

Forecasting Corn Futures Volatility in the Presence of Long Memory, Seasonality and Structural Change
Provedor de dados: 31
Autores: Wang,   Xiaoyang; Garcia,   Philip.
Price volatility in the corn market has changed considerably globalization and stronger linkages to the energy complex. Using data from January 1989 through December 2009, we estimate and forecast the volatility in the corn market using futures daily prices.  Estimates in a Fractional Integrated GARCH framework identify the importance of long memory, seasonality, and structural change.  Recursively generated forecasts for up to 40-day horizons starting in January 2005 highlight the importance of seasonality, and long memory specifications which perform well at more distant horizons particularly with rising volatility. The forecast benefits of allowing for structural change in an adaptive framework are more difficult to identify except at more distant...
Tipo: Conference Paper or Presentation
Palavras-chave: Corn price volatility; Long memory; Seasonality; Structural change; Forecasting; Agricultural Finance; Risk and Uncertainty.
Ano: 2011
URL: http://purl.umn.edu/103749

AN EVALUATION OF THE EFFECTIVENESS OF THE FLORIDA COOPERATIVE'S SEASONAL PRICING PLAN ON SEASONAL PRODUCTION VARIABILITY
Provedor de dados: 31
Autores: Washington,   Andrew A.; Lawson,   Robert W., Jr.; Kilmer,   Richard L.
From 1993 - 1995, Florida dairy cooperatives implemented a seasonal pricing plan in an attempt to decrease the variability in seasonal production. Farmers that participated in the seasonal pricing plan were able to reduce seasonality in each year when compared to 1992 by as much as 20 percent. For farmers that did not participate, seasonality increased in each year by as much as 32 percent. Overall, the seasonal pricing plan was effective in reducing seasonality for those farmers that chose to participate in the plan and that its limited short-run success was the result of seasonality increases by non-participating farms.
Tipo: Journal Article
Palavras-chave: Amplitude; Seasonal pricing plan; Seasonality; Livestock Production/Industries.
Ano: 2000
URL: http://purl.umn.edu/15389

ANÁLISE SAZONAL PARA A SÉRIE E OS COMPONENTES DO CUSTO DA CESTA BÁSICA DE LAVRAS, MG.
Provedor de dados: 31
Autores: Costa Carvalho,   Pedro Luiz; Safadi,   Thelma; Ferraz,   Marcelo Inacio Ferreira.
The effects of seasonal fluctuations caused by weather and natural fluctuations in demand and supply have influenced the price of various agricultural products, leading many times to an oscillation of prices to be mistakenly linked to further factors. In an attempt to better understand how the influence of the seasonal factor works for the prices of agricultural products, this paper has the objective of analyzing the seasonal behavior the Cost of Basic Basket series (basic food) in Lavras, MG, and its components, besides making a comparison between the direct and indirect form of the disseasonalize the series of Cost of Basic Basket. The data were obtained from the UFLA Department of Administration and Economics and cover the period from January 1995 to...
Tipo: Journal Article
Palavras-chave: Ajuste direto; Ajuste indireto; Cesta básica; Sazonalidade; X-12 Arima; Direct adjustment; Indirect adjustment; Basic basket; Seasonality; X-12 Arima.; Public Economics.
Ano: 2010
URL: http://purl.umn.edu/102032

Demand for seasonal wage labour in agriculture: what does family farming hide?
Provedor de dados: 31
Autores: Darpeix,   Aurelie; Bignebat,   Celine; Perrier-Cornet,   Philippe.
Seasonal wage labour was rarely distinguished from the permanent one in farm-household models although it has sharply increased in developed countries. Therefore, we propose to endogenize the demand for this peculiar labour type and highlight the trade-offs for the various labour combinations on farms. We use data on fruit and vegetables farms drawn from the 2000 French agricultural census. We show that seasonal wage labour is a substitute for permanent wage employment, and doesn't entirely follow the seasonality of the agricultural activity: competition on the labour and product markets play a significant role in the employment of labour types.
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural household model; Wage labour; Seasonality; France; Consumer/Household Economics; Farm Management; Labor and Human Capital; Production Economics; J43; D13; J23; Q12.
Ano: 2009
URL: http://purl.umn.edu/50956

PRACTICES USED BY DAIRY FARMERS TO REDUCE SEASONAL PRODUCTION VARIABILITY
Provedor de dados: 31
Autores: Washington,   Andrew A.; Larson,   Robert W., Jr.; Kilmer,   Richard L.
Results of this study further support the effectiveness of the seasonal pricing plan in reducing seasonal production variability. Florida Dairy farmers were able to change factors that affect production in order to take advantage of the seasonal pricing plan and that farmers that chose not to participate were able to affect factors to increase production seasonality.
Tipo: Conference Paper or Presentation
Palavras-chave: Seasonality; Demand and Price Analysis; Livestock Production/Industries.
Ano: 1999
URL: http://purl.umn.edu/21500

U.S. Citrus Import Demand: Seasonality and Substitution
Provedor de dados: 31
Autores: Baldwin,   Katherine L.; Jones,   Keithly G.
Citrus fruits make up one-fifth of all fresh fruit consumed in the United States. Given the increasing importance of imported citrus in the diet of American consumers, it is perhaps surprising that no import demand analysis of U.S. citrus has been conducted. Using quarterly U.S. import data for six citrus commodities, we employed a demand systems model and evaluated aspects of seasonality. The results suggest wide variations in price responses to different types of imported citrus. The average amplitude and phase shift suggest that all citrus fruits exhibit some seasonality in their imports, likely a result of peak harvesting schedules of exporters.
Tipo: Presentation
Palavras-chave: Fresh citrus; Oranges; Limes; Lemons; Grapefruit; Mandarins; Import demand; Seasonality; Demand and Price Analysis; International Relations/Trade.
Ano: 2012
URL: http://purl.umn.edu/119741

DETERMINANTS OF WHOLESALE BEEF-CUT PRICES
Provedor de dados: 31
Autores: Capps,   Oral, Jr.; Farris,   Donald E.; Byrne,   Patrick J.; Namken,   Jerry C.; Lambert,   Charles D.
Key determinants of monthly wholesale prices for 12 beef cuts include the quantity of the specific cut, stickiness in prices, marketing costs, quantities of pork and chicken, and seasonality.  Seasonal patterns across the respective cuts are very different.  Relative to the price in December, prices at the wholesale level in other months can be as much as 6 percent lower to as much as 21 percent higher.
Tipo: Journal Article
Palavras-chave: Wholesale prices; Beef cuts; Seasonality; Demand and Price Analysis; Livestock Production/Industries.
Ano: 1994
URL: http://purl.umn.edu/15429

A Reserve-Balancing Pool for Services by Dairy Cooperatives
Provedor de dados: 31
Autores: Ling,   K. Charles.
The rationale for compensating dairy cooperatives for the costs incurred in balancing milk supply for the fluid market is examined. A reserve-balancing pool is proposed to facilitate deducting supply-balancing service credit from a marketwide producer pool and making payment to cooperatives for providing the services. The volume of necessary reserves maintained for the fluid market determines the size of the reserve-balancing pool. A dairy cooperative qualifies for pool payment based on the volume of milk delivered for fluid uses and on the volume of necessary reserves actually balanced. An alternative qualification is to allocate the volume of necessary reserves each cooperative has to balance according to a cooperative's market share of milk for fluid...
Tipo: Report
Palavras-chave: Cooperative; Milk; Reserve-balancing pool; Seasonality; Manufacturing costs; Marketwide services; Agribusiness.
Ano: 1985
URL: http://purl.umn.edu/50731

THE DESEASONALIZATION OF ANIMAL PRODUCTION
Provedor de dados: 31
Autores: Roosen,   Jutta; Hennessy,   David A.
We document the deseasonalization of animal production in the US and Europe.  Hypotheses on causes and consequences of this trend are advanced.  They pertain to feed costs, changes in animal productivity and cost fixity of the underlying technology, innovations in genetic control and epidemiology, and the capital intensity of production.
Tipo: Conference Paper or Presentation
Palavras-chave: Animal Production; Capital Intensity; Dairy; Industrialization; Seasonality; Livestock Production/Industries.
Ano: 2003
URL: http://purl.umn.edu/22068

CHANGING SEASONAL PATTERNS IN THE POULTRY MARKET
Provedor de dados: 31
Autores: Ji,   Wen.
The role of seasonality in modeling agricultural markets is well recognized. However, traditional approaches to account for seasonality assume that seasonal pattern is constant, even though some evidence of changing seasonal pattern exists in the literature. This paper seeks to explore the impact of incorporating changing seasonal pattern into poultry market modeling.  Keywords: seasonality, trigonometric variable, seasonal frequency.
Tipo: Conference Paper or Presentation
Palavras-chave: Seasonality; Trigonometric variable; Seasonal frequency.; Livestock Production/Industries; Marketing.
Ano: 2000
URL: http://purl.umn.edu/21860

AN EMPIRICAL ANALYSIS OF THE DEMAND FOR WHOLESALE PORK PRIMALS: SEASONALITY AND STRUCTURAL CHANGE
Provedor de dados: 31
Autores: Parcell,   Joseph L.
A set of inverse wholesale pork primal demand models were estimated to estimate wholesale pork primal own-quantity flexibility's, to determine seasonal price fluctuations, and to examine whether the flexibility's have changed in absolute magnitude over time. Results of this analysis indicate that there is the own-quantity flexibility for some primals differences by season with in the year. Additionally, it was determined that the own-quantity flexibility increased in magnitude (absolute value) over time for some of the primal cuts evaluated here. However, for Hams and Boston Butt the own-flexibility was either unchanged or increased over the period analyzed. Increased cold storage stocks for these primals may have been used to offset the price decline of...
Tipo: Conference Paper or Presentation
Palavras-chave: Wholesale Pork Primals; Structural Change; Seasonality; Demand and Price Analysis; Livestock Production/Industries.
Ano: 2000
URL: http://purl.umn.edu/36343

Option Pricing on Renewable Commodity Markets
Provedor de dados: 31
Autores: Jin,   Na; Lence,   Sergio H.; Hart,   Chad E.; Hayes,   Dermot J.
Options markets on agricultural commodities with maturities that exceed 13 months seldom trade. Our hypothesis is that this market failure is due to the absence of an accurate option pricing model for commodities where mean reversion can be expected. Standard option pricing models assume proportionality between price variance and time to maturity. This proportionality is not a valid assumption for commodities where supply response works to bring prices back to production costs. The model suggests that  traditional option pricing models will overprice long-term options on these markets.
Tipo: Conference Paper or Presentation
Palavras-chave: Commodity futures and option; Price mean reverting; Seasonality; Agricultural Finance; Financial Economics.
Ano: 2010
URL: http://purl.umn.edu/60955

Seasonal Asymmetric Price Transmission in Ghanaian Tomato Markets: Adapting Johansen’s Estimation Method
Provedor de dados: 31
Autores: Amikuzuno,   Joseph; Ihle,   Rico.
We assess market integration and price transmission of perishable agricultural produce in Sub-Saharan Africa by studying Ghanaian tomato markets which are characterized by pronounced seasonality in production and trade flows. We analyse the tomato markets of Ghana by simultaneously regarding its five most important markets, Navrongo, Techiman, Kumasi, Tamale and Accra, in a multivariate asymmetric price transmission framework. The estimation of the model is based on a unique dataset and on a modified version of the Johansen estimation procedure which is suitable for estimating such multivariate models. We estimate the price transmission parameters for four regimes which are a combination of the seasonal patterns in trade flows and asymmetries in the...
Tipo: Conference Paper or Presentation
Palavras-chave: Asymmetric price transmission; Cointegration; Ghana; Regime-dependent model; Seasonality; Tomato; Vector error-correction model; Crop Production/Industries; Demand and Price Analysis; C32; Q11; Q13; F14; F15.
Ano: 2010
URL: http://purl.umn.edu/96814

Does Futures Price Volatility Differ Across Delivery Horizon?
Provedor de dados: 31
Autores: Karali,   Berna; Dorfman,   Jeffrey H.; Thurman,   Walter N.
We study the difference in the volatility dynamics of CBOT corn, soybeans, and oats futures prices across different delivery horizons via the smoothed Bayesian estimator of Karali, Dorfman, and Thurman (2010). We show that the futures price volatilities in these markets are affected by the inventories, time to delivery, and the crop progress period. Some of these effects vary across delivery horizons. Further, it is shown that the price volatility is higher before the harvest starts in most of the cases compared to the volatility during the planting period. These results have implications for hedging, options pricing, and the setting of margin requirements.
Tipo: Conference Paper or Presentation
Palavras-chave: Bayesian econometrics; Futures markets; Seasonality; Theory of storage; Volatility; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Consumer/Household Economics; Demand and Price Analysis; Farm Management; Financial Economics; Marketing; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/53036

Seasonal Price Patterns for Arkansas Soybeans
Provedor de dados: 31
Autores: Stark,   C. Robert, Jr.; Bryant,   Kelly J.
Seasonality is generally regarded as a major feature in soybean market price variations.  Recent years in Arkansas have seen considerable construction of on-farm storage, a move that could mitigate the seasonality effect on price variations.  A study comparing cash price indices from the past ten years with results from a 1986 Arkansas study and a recent national-level study found that Arkansas soybean prices appear to have followed a consistent and logical pattern around their national average in spite of increased variability and uncertainty.
Tipo: Conference Paper or Presentation
Palavras-chave: Seasonality; Soybean; Cash price index; Demand and Price Analysis; Farm Management; Marketing.
Ano: 2010
URL: http://purl.umn.edu/56471

VERIFICAÇÃO DA EXISTÊNCIA DA COMPONENTE SAZONAL NA SÉRIE DO CUSTO DA CESTA BÁSICA DO MUNICÍPIO DE LAVRAS, MG, UTILIZANDO O MÉTODO X-12 ARIMA
Provedor de dados: 31
Autores: Carvalho,   Pedro Luiz Costa; Ferraz,   Marcelo Inacio Ferreira; Safadi,   Thelma.
This paper has the objective to studying the seasonal behavior of the series of Cost of Basic Basket (basic food) in Lavras county, MG, using one of the most modern and recent methods of seasonal adjustment, the method X-12ARIMA, developed for the U.S. Census Bureau. If seasonal is identified, one seasonal adjustment will be made using the automatic program of X-12 ARIMA. The data basis was provided by the Department of Management and Economics – DAE – of the University of Lavras – UFLA – including monthly observation from January of 1995 to December of 2004. The existence of seasonal was proved in the series of the Cost of Basic Basket of Lavras, MG. The analysis of the graph on the seasonal effects showed that from October to March (rain period) the...
Tipo: Journal Article
Palavras-chave: Basket basic; Seasonality; Time series; X-12 ARIMA.
Ano: 2006
URL: http://purl.umn.edu/43822

Modelando a sazonalidade e o processo gerador da série de tempo do emprego rural no estado de São Paulo
Provedor de dados: 31
Autores: Fredo,   Carlos Eduardo; Margarido,   Mario Antonio.
This paper used the X-12 method, seasonal unit root and Autoregressive Integrated Moving Average Model to identify and to model the generator process of rural employment in the state of São Paulo in the period from January 1996 to December 2006. The results show that there is strong seasonal demand for occasional rural employment from April to August for several main harvests. The seasonal unit root test detected the presence of seasonal unit root. This result confirms the presence of a seasonal pattern in the rural employment time series. The ARIMA model caught the rural employment dynamism for occasional workers. It was necessary to add three moving average parameters of small orders, beyond a seasonal moving average parameter, and an autoregressive...
Tipo: Journal Article
Palavras-chave: Rural employment; Seasonality; ARIMA model; X-12 method; Labor and Human Capital.
Ano: 2008
URL: http://purl.umn.edu/53854

Pricing Plans for Managing Seasonal Deliveries by Dairy Cooperatives
Provedor de dados: 31
Autores: Ling,   K. Charles.
This study develops a method to devise pricing plans for dairy cooperatives to recover costs of handling seasonal milk deliveries from producers and the cost of satisfying handlers' cyclical fluid demand. Based on analyses of hauling and manufacturing costs, charges against producers and handlers are formulated. Manufacturing cost is the major component of producer charges. Give-up charges against handlers are determined by the cooperative's manufacturing cost, while hauling cost is the main consideration in servicing handlers' day-to-day fluctuation of fluid demand.
Tipo: Report
Palavras-chave: Milk; Seasonality; Pricing plans; Hauling cost; Manufacturing cost; Give-up charges; Agribusiness.
Ano: 1982
URL: http://purl.umn.edu/50805

Canary Island Tomato Exports: A Structural Analysis of Seasonality
Provedor de dados: 31
Autores: Rodriguez,   Gloria Martin; Hernandez,   Jose Juan Caceres.
The European tomato market is characterised by a constant process of dynamic adjustment toward the equilibrium. Furthermore, Canary tomato exports cause a high seasonal impact on market prices in the winter period. In these circumstances, an adequate distribution of shipments throughout the campaign could contribute to maximize producers' profits. The goal of this paper is to analyse the seasonal pattern of Canary tomato exports to Europe throughout the first fourteen campaigns following Spanish integration into the European Union. These export levels show some degree of instability, clearly related to the changes in the European Union trade rules, and there is a long period, the summer, without exports. Moreover, we have opted by using weekly data. These...
Tipo: Conference Paper or Presentation
Palavras-chave: Canary tomato exports; Weekly data; Seasonality; Structural models; Splines; International Relations/Trade.
Ano: 2002
URL: http://purl.umn.edu/24901

Dynamic Assessment of Bertrand Oligopsony in the U.S. Cattle Procurement Market
Provedor de dados: 31
Autores: Ji,   In Bae; Chung,   Chanjin.
The new empirical industrial organization approach with the Bertrand model is employed to measure the oligopsony market power in the U.S. cattle procurement market. The assumption of price competition (Bertrand model) based on the nature of cattle production such as cattle cycle and seasonality is used and compared to quantity competition (Cournot model). The empirical results show that the oligopsony market power exists in the U.S. cattle procurement market. The cattle cycle and seasonality affect the oligopsony market power and the cattle cycle causes the change of market power. However, concentration has a negative effect on the oligopsony market power.
Tipo: Conference Paper or Presentation
Palavras-chave: Cattle cycle; Concentration; Market power; NEIO; Oligopsony; Seasonality; Agribusiness; Demand and Price Analysis; Industrial Organization; Livestock Production/Industries; Marketing; Q13; L13; L16.
Ano: 2011
URL: http://purl.umn.edu/103558

Seasonality and Costs of Production on Irish dairy farms from 2000-2007
Provedor de dados: 31
Autores: Smyth,   Paul; Harte,   Laurence; Hennessy,   Thia C.
This paper examines the relationship between calving date and production costs on Irish dairy farms from 2000-2007. Using data from the National Farm Survey, the median calving dates of 400 dairy farms are studied each year using econometric analysis to determine the relationship between calving date and production costs. Farms are divided into five categories according to their median calving date. These categories are imputed into a panel dataset as dummy variables. Unobservable individual effects are controlled for using a fixed effect model; examples of such effects are land quality and managerial ability, Results suggest that when scale and those unobserved effects are controlled for, there was no significant difference in total cost of production per...
Tipo: Conference Paper or Presentation
Palavras-chave: Seasonality; Fixed effect; Calving date; Production Economics.
Ano: 2009
URL: http://purl.umn.edu/51076

MODELOS DE SÉRIES TEMPORAIS APLICADOS À SÉRIE DOS ÍNDICES DE PREÇOS AO CONSUMIDOR NA REGIÃO DE LAVRAS, MG, NO PERÍODO DE 1992 A 1999
Provedor de dados: 31
Autores: Silva,   Roberta Bessa Veloso; Ferreira,   Daniel Furtado; Safadi,   Thelma.
This piece of work was carried out objectifying to adjust the time series models to the series of price indexes for the consumer ( PIC ) of Lavras MG. It aimed at verifying the occurrence of differences in trend as for the period which preceeded, as well as for the one which succeeded the Plano Real, and if there was a simple linear trend along with Plano Real ( 1994-1999 ) as well as if any seasonality occurred. It also objectified to comparing the series of both Lavras and the Federal District. It was verified that there was no trend along the whole series, nor there was any seasonality, notwithstanding the fact that a level change occurred, which was characterized as an intervention, rather than a trend. It was necessary to fit a model featuring an...
Tipo: Journal Article
Palavras-chave: Price index to the consumer; Trend; Seasonality; Forecast.
Ano: 2000
URL: http://purl.umn.edu/43355

Flower Power at the Dutch Flower Auctions? Application of an Inverse Almost Ideal Demand System
Provedor de dados: 31
Autores: Steen,   Marie.
Information on price-quantity relationships will enable flower producers to reduce risk and raise profits through better timing of rotations as well as better utilization of limited greenhouse space. The present paper presents econometric evidence on such price-quantity relationships for major species of cut flowers at the Dutch flower auctions. Specifically, an inverse linear approximate almost ideal demand model with seasonal adjustments is applied. This paper is introducing trigonometric functions as a flexible and inexpensive alternative that outperforms standard seasonal dummies. Major findings are that all flexibilities (quantity elasticities) are strongly significant. Own price flexibilities are negative as expected. The own flexibilities vary...
Tipo: Conference Paper or Presentation
Palavras-chave: Risk management; Cut flower production; Inverse linear AIDS; Seasonality; Trigonometric functions; Demand and Price Analysis; Q11; D12.
Ano: 2006
URL: http://purl.umn.edu/25441

ANÁLISE DA ESTACIONALIDADE DE PREÇOS DA MAMONA NO PARANÁ
Provedor de dados: 31
Autores: Silva,   Gerson Henrique Da; Esperancini,   Maura Seiko Tsutsui; Melo,   Carmen Ozana De; Bueno,   Osmar De Carvalho.
Com o aumento de preços e consumo do petróleo, tem-se procurado na biomassa alternativa energética renovável para sua substituição. Dentre as culturas capazes de atender à produção de insumo destinado à obtenção de energia renovável encontra-se a mamona. Objetivou-se, neste trabalho, conhecer o índice de variação estacional do preço da mamona, pois é essencial para a previsão de seu preço em determinada época do ano. Utilizou-se o preço da mamona recebido pelos produtores paranaenses e adotou-se a metodologia da média geométrica móvel centralizada de 12 meses, obtendo-se um padrão comportamental (sazonal). A análise mostrou que os preços tendem a ser maiores nos meses de janeiro a maio e, no período seguinte, a tendência  é de queda de preços, coincidindo...
Tipo: Conference Paper or Presentation
Palavras-chave: Mamona; Produtores; Preço; Sazonalidade; Biodiesel; Castor bean; Producers; Price; Seasonality; Biodiesel; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/109119

Seasonality in the Irish dairy processing industry
Provedor de dados: 31
Autores: Heinschink,   Karin E.; Shalloo,   Laurence; Wallace,   Michael T.
The dairy landscape in the Republic of Ireland is characterized by pastoral spring-calving systems and a bell-shaped milk production curve. This seasonality at producer level initiates various implications at processor level, such as poor utilization of plant capacity off-peak season, a requirement for seasonal labour management and limited product options in autumn and winter months due to the properties of late-lactation milk. An optimization model was developed to analyze the impact of production seasonality and quota removal on the Irish dairy processing industry in terms of maximum processor gross surplus, the optimum product mix and the marginal values of the milk solids fat, protein and lactose. Processor gross surplus was specified as a function of...
Tipo: Conference Paper or Presentation
Palavras-chave: Dairy processing; Seasonality; Milk quota abolition; Processor profit; Product mix; Farm Management; Livestock Production/Industries.
Ano: 2011
URL: http://purl.umn.edu/108939

An Empirical Analysis of the Demand for Wholesale Pork Primals: Seasonality and Structural Change
Provedor de dados: 31
Autores: Parcell,   Joseph L.
This study focuses on estimating wholesale pork primal demand relationships in order to determine their own-quantity flexibilities, whether these flexibilities have changed over time, and seasonal price fluctuations. A set of equations for pork loin, rib, butt, ham, pork belly, and picnic primals was estimated. Monthly data over an 11-year period were used to determine that own-quantity flexibilities varied across months, that they increased in absolute value over time for some primal cuts, and cold-storage stocks were used as an inventory control measure to reduce price variation for some primal cuts.
Tipo: Journal Article
Palavras-chave: Seasonality; Structural change; Wholesale pork primals; Demand and Price Analysis.
Ano: 2003
URL: http://purl.umn.edu/31102

Components of Grain Futures Price Volatility
Provedor de dados: 31
Autores: Karali,   Berna; Thurman,   Walter N.
We analyze the determinants of daily futures price volatility in corn, soybeans, wheat, and oats markets from 1986 to 2007. Combining the information from simultaneously traded contracts, a generalized least squares method is implemented that allows us to clearly distinguish among time-to-delivery effects, seasonality, calendar trend, and volatility persistence. We find strong evidence of time-to-delivery (Samuelson) effects and systematic seasonal components with volatility increasing prior to harvest times— an indirect confirmation of the theory of storage.
Tipo: Journal Article
Palavras-chave: Futures markets; Samuelson effect; Seasonality; Time to maturity; Volatility; Crop Production/Industries; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/93205

The UK Consumer's Attitudes to, and Willingness to Pay for, imported Foods
Provedor de dados: 31
Autores: Arnoult,   Matthieu H.; Lobb,   Alexandra E.; Tiffin,   J. Richard.
We report results from an investigation into consumer preferences for locally produced foods. Using a choice experiment we estimate willingness to pay for foods of a designated origin together with certification for Organic and GM free status.  Our results indicate that there is a preference for locally produced food which is GM free, Organic and produced in the traditional season.
Tipo: Conference Paper or Presentation
Palavras-chave: Imported food; Seasonality; Willingness-to-pay; Choice experiment; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; International Relations/Trade.
Ano: 2007
URL: http://purl.umn.edu/7893

Exportacion de un tomate en Canarias: un patron estacional estable?
Provedor de dados: 31
Autores: Rodriguez,   Gloria Martin; Cano,   Victor; Hernandez,   Jose Juan Caceres.
RESUMEN: En este trabajo se analiza el patrón estacional de la exportación semanal de tomate canario desde el ingreso de España en la Unión Europea. Un primer examen de los componentes determinísticos de la serie revela la inestabilidad de éstos, claramente vinculada a los cambios en la normativa comercial de acceso a los mercados europeos, así como la presencia de numerosas observaciones anómalas causadas por fenómenos de diversa índole. Estas circunstancias afectan al estudio detallado de la estacionalidad estocástica de la serie bajo estudio, que reúne dos características —la frecuencia semanal de las observaciones y la existencia de períodos sin exportación— cuya consideración es imprescindible para recoger apropiadamente la conducta de las...
Tipo: Journal Article
Palavras-chave: Tomato exports; Seasonality; Unit roots; Structural time series models; Outliers; Crop Production/Industries; Q17.
Ano: 2002
URL: http://purl.umn.edu/28763

The Optimal Season Length for a Sugar Mill in the Australian Sugar Industry
Provedor de dados: 31
Autores: Beard,   Rodney; Wegener,   Malcolm K.
In this paper we present a model of the optimal crushing season length for sugar cane. The approach taken is to view the optimal season length problem as an optimal stopping problem for both the Mill and a representative grower. We formulate the optimal stopping problems for both Mill and grower based on \real option" theory using Ito calculus. Because the interests of the Mill and growers do not coincide this results in a stochastic differential game of optimal stopping. We solve the model numerically using a finite difference algorithm.
Tipo: Presentation
Palavras-chave: Sugarcane Harvesting; Seasonality; Real Option Theory; Optimal Stopping; Ito Calculus; Stochastic Differential Games.; Production Economics.
Ano: 1999
URL: http://purl.umn.edu/123762

Speaking Stata: Graphs for all seasons
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Time series showing seasonality—marked variation with time of year—are of interest to many scientists, including climatologists, other environmental scientists, epidemiologists, and economists. The usual graphs plotting response variables against time, or even time of year, are not always the most effective at showing the fine structure of seasonality. I survey various modifications of the usual graphs and other kinds of graphs with a range of examples. Although I introduce here two new Stata commands, cycleplot and sliceplot, I emphasize exploiting standard functions, data management commands, and graph options to get the graphs desired.
Tipo: Journal Article
Palavras-chave: Cycleplot; Sliceplot; Seasonality; Time series; Graphics; Cycle plot; Rotation; State space; Incidence plots; Folding; Repeating; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117590

Growth and reproduction of the understory palm Geonoma schottiana Mart. in the gallery forest in Central Brazil
Provedor de dados: 88
Autores: Sampaio,Maurício Bonesso; Scariot,Aldicir.
To understand the growth and reproduction of the palm Geonoma schottiana in the gallery forest of Central Brazil, two hypotheses were raised: (i) production of leaves and reproductive structures are concentrated in the period of the year with high light availability; (ii) leaf production and reproductive activity are related to plant length. However, it is expected that senility effects will cause fast reduction in growth and reproduction activities in higher plants. Growth and reproduction were concentrated in the dry season, when insolation is higher than in the wet season, suggesting that leaf and inflorescence production on G. schottiana in the gallery forest understory is more limited by light than by soil humidity. As the individual grows, leaf...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Life stage; Reproductive and vegetative phenology; Seasonality; Senescence.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042008000300007

Fenologia da copaíba (Copaifera langsdorffii Desf. -- Leguminosae, Caesalpinioideae) em uma floresta semidecídua no sudeste do Brasil
Provedor de dados: 88
Autores: PEDRONI,FERNANDO; SANCHEZ,MARYLAND; SANTOS,FLAVIO A.M.
A fenologia da emissão foliar, floração e frutificação para espécies de florestas tropicais é pouco conhecida, embora estes ecossistemas apresentem grande diversidade de padrões fenológicos. Foi estudada, de fevereiro de 1991 a abril de 1993, a fenologia da copaíba (Copaifera langsdorffii Desf.) na Reserva de Santa Genebra. Foram feitas observações em 36 indivíduos e analisadas queda de folhas, brotamento, floração e frutificação. A queda de folhas e o brotamento foram as fenofases mais sincronizadas dentro da população. Estes eventos ocorreram no final da estação seca (queda de folhas) e início da estação chuvosa (brotamento) e foram relacionados principalmente com a precipitação. A floração ocorreu na estação chuvosa e a frutificação na estação seca. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seasonality; Leaf fall; Leaf flushing; Flowering; Fruiting.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000200007

Seasonal variation of Alphitobius diaperinus population in broiler facilities in the center-north region of the state of São Paulo
Provedor de dados: 89
Autores: Camargo Neto,AF; Tallarico,E; Capriogli,MA; Soares,VE; Meireles,MV; Silva,GS.
The seasonality of Alphitobius diaperinus population was studied during different seasons during one year, in broiler facilities located in the center-north region of the State of São Paulo. Parasite counting was weekly carried out by the use of traps adapted from the modified model of Arends. During the experimental period, facilities were not submitted to chemical treatment, and the litter was changed between flocks. A lower number of adults and larvae was observed during autumn, with the peak registered in the summer. There was no significant difference between spring and winter averages (adults and larvae), and between spring and summer averages (adults). Average temperatures in the facilities varied from 23.4ºC (winter) to 27.1ºC (spring). The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alphitobius diaperinus; Broiler chickens; Monitoring; Seasonality.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2006000300008

Mites associated to Xylopia aromatica (Lam.) Mart. (Annonaceae) in urban and rural fragments of semidecidual forest
Provedor de dados: 92
Autores: Nuvoloni,Felipe M.; Feres,Reinaldo J. F.; Demite,Peterson R.
Mites associated to Xylopia aromatica (Lam.) Mart. (Annonaceae) in urban and rural fragments of semidecidual forest. Native plants can shelter a great diversity of mites. Notwithstanding, the conservation of the forest fragments where the plants are located can influence the structure of the mites community. Generally, in homogenous environments the diversity is lower due to the dominance of one or a few species. In this work, we studied the mite community on Xylopia aromatica (Lam.) Mart. (Annonaceae) in two fragments of semidecidual forest: one on rural and other on urban area. Seven individuals of X. aromatica were monthly sampled from April 2007 to March 2008, in each of these fragments. Descriptive indexes of diversity, dominance and evenness were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mite fauna; Native plants; Preservation; Seasonality; Urban impact.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262011000400013

Seasonal activity of Dinoponera quadriceps Santschi (Formicidae, Ponerinae) in the semi-arid Caatinga of northeastern Brazil
Provedor de dados: 92
Autores: Medeiros,Jeniffer; Araújo,Arrilton; Araújo,Helder F. P.; Queiroz,João Paulo C.; Vasconcellos,Alexandre.
Seasonal activity of Dinoponera quadriceps Santschi (Formicidae, Ponerinae) in the semi-arid Caatinga of northeastern Brazil. We studied seasonal foraging patterns of the queenless ant D. quadriceps (Formicidae, Ponerinae) for 24 months in a Caatinga area of northeastern Brazil, an ecosystem characterized by strong climatic changes throughout the year, in order to determine if regulation of worker activity is based on environmental conditions (air temperature, relative humidity, precipitation) and/or food resources (potential prey: Coleoptera, Diptera, Hemiptera, Hymenoptera, Lepidoptera, Orthoptera, Araneae, Chilopoda and Diplopoda). Foraging activity of D. quadriceps varied over the course of both years, with the highest frequency occurring from May to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ants; Environmental factors; Foraging; Neotropical region; Seasonality.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262012000100013

Nesting biology of the trap-nesting Neotropical wasp Trypoxylo n(Trypargilum) aurifrons Shuckard (Hymenoptera, Crabronidae)
Provedor de dados: 92
Autores: Santoni,Mariana Marchi; Del Lama,Marco Antonio.
The present study was carried out in three localities of the state of São Paulo, Brazil: Araras (Dec/03-Dec/06), São Carlos (Nov/04-Nov/06) and Rifaina (Jul/04-Dec/06). Trap-nests were distributed among sites in the sampling areas and were collected every 35 days. Data from 295 nests indicate that T. aurifrons is a multivoltine species, with higher rates of nest building and cell production in the warm, rainy season. The trap-nests used by the females ranged from 117 to 467 mm in length and 3.1 to 16.6 mm in diameter. All nests showed deep plugs and a vestibular cell was found in 37% of the complete nests. The number of cells per nest ranged from one to 12. Females were larger than males, emerged from longer cells and their cocoons were significantly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nest architecture; Parasitoid; Prey; Sex ratio; Seasonality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262007000300015

Attractivity of omnivore, carnivore and herbivore mammalian dung to Scarabaeinae (Coleoptera, Scarabaeidae) in a tropical Atlantic rainforest remnant
Provedor de dados: 92
Autores: Filgueiras,Bruno K. C.; Liberal,Carolina N.; Aguiar,Cristina D. M.; Hernández,Malva I. Medina; Iannuzzi,Luciana.
In this study, performed in a remnant of Brazilian Atlantic Forest, three types of dung from animals with distinct alimentary habits were utilized, in order to verify possible differences of attractivity of these dungs to the Scarabaeinae and the influence of seasonality in the attractivity. Three habitats were sampled: edge, clearing and forest core, each with 40 pitfall traps. A total of 2,137 beetles were collected from August 2005 to July 2006. Canthidium sp. 1 (43%) and Dichotomius sericeus (41%) were the most abundant species. From the total number of beetles collected, 80.5% were attracted to human dung, 11% to jaguar dung, 7.8% to waterbuck dung and 0.7% to the control. The species Canthidium sp.1, Canthidium sp. 2, Ateuchus sp., Canthon...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic forest; Bait; Dung beetles; Seasonality.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262009000300017

Seasonality and temporal structuration of Alticini community (Coleoptera, Chrysomelidae, Galerucinae) in the Araucaria Forest of Parana, Brazil
Provedor de dados: 92
Autores: Linzmeier,Adelita Maria; Ribeiro-Costa,Cibele Stramare.
Seasonality was studied for Alticini trapped with malaise over a period of two years in the Vila Velha State Park, Parana, Brazil. Coleoptera, Chrysomelidae and Alticini showed seasonal distribution, with the highest abundance during spring and summer months. The abundance peaks of these groups were not synchronized. Of all environmental variables tested, photoperiod had the larger effect on the distributional patterns of Coleoptera, Chrysomelidae and Alticini. Also, Chrysomelidae and Alticini probably are related to the quality and availability of host-plants. When richness was high there was a greater similarity among seasons of different years. However, when richness was not pronounced, seasons showed more similarity within the same year than between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Community structure; Competition; Herbivorous; Seasonality.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262008000200009

Fauna de Muscidae (Diptera) em três localidades do Estado do Paraná, Brasil, capturada por armadilha Malaise
Provedor de dados: 92
Autores: Costacurta,Nise do Carmo; Marinoni,Renato C.; Carvalho,Claudio J. B. de.
During two years, from August 1986 to July 1988, the entomofauna of some preserved areas of Parana State, southern Brazil, was sampled in a project called "Levantamento da Fauna Entomológica no Estado do Paraná (PROFAUPAR)". Specimens of Muscidae (Diptera) were sorted out from the material collected using Malaise traps in three of the eight sites sampled (Colombo, Ponta Grossa and Guarapuava) in the first year (August 1986 to July 1987). A total of 7,014 specimens of Muscidae was captured and 91 species were identified. Neodexiopsis flavipalpis Albuquerque was the most abundant species in Ponta Grossa (672 specimens) and in Guarapuava (332 specimens). For Colombo, the most abundant species was Neodexiopsis vulgaris Couri &amp;amp; Albuquerque (172...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alpha diversity; Beta diversity; Faunistic; Seasonality; Species richness estimators.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262003000300005

Orchid bee baits attracting bees of the genus Megalopta (Hymenoptera, Halictidae) in Bauru region, São Paulo, Brazil: abundance, seasonality, and the importance of odors for dim-light bees
Provedor de dados: 92
Autores: Knoll,Fátima R. N.; Santos,Leandro M.
Nocturnal bees in the genus Megalopta Smith, 1853 are generally collected using artificial light sources. However, between 1993 and 2000, a total of 946 females (no males were captured) were captured using aromatic baits commonly used for orchid bees (Euglossini) in five localities in Bauru region, São Paulo, Brazil. Aromatic compounds used in bait traps were: benzyl acetate, eucalyptol, eugenol, skatole, methyl salicylate, and vanillin. The Megalopta species collected were: M. guimaraesi (71.2% of total number of specimens), M. amoena (28.1%), and M. aegis (0.6%). Using the data from these traps, we showed that there was a positive and significant correlation between the abundance of individuals and meteorological factors, rainfall and temperature. Bees...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Chemical baits; Scent; Seasonality.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262012000400013

Evaluating leaf litter beetle data sampled by Winkler extraction from Atlantic forest sites in southern Brazil
Provedor de dados: 92
Autores: Hopp,Philipp Werner; Caron,Edilson; Ottermanns,Richard; Roß-Nickoll,Martina.
Evaluating leaf litter beetle data sampled by Winkler extraction from Atlantic forest sites in southern Brazil. To evaluate the reliability of data obtained by Winkler extraction in Atlantic forest sites in southern Brazil, we studied litter beetle assemblages in secondary forests (5 to 55 years after abandonment) and old-growth forests at two seasonally different points in time. For all regeneration stages, species density and abundance were lower in April compared to August; but, assemblage composition of the corresponding forest stages was similar in both months. We suggest that sampling of small litter inhabiting beetles at different points in time using the Winkler technique reveals identical ecological patterns, which are more likely to be influenced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coleoptera; Comparison; Pitfall traps; Sampling method; Seasonality.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262011000200017

Ecological anatomy of Eugenia luschnathiana (O.Berg) Klotzsch ex B.D.Jacks. (Myrtaceae) leaves in the Restinga region, state of Ceara
Provedor de dados: 94
Autores: Lemos,Viviane de Oliveira Thomaz; Lucena,Eliseu Marlônio Pereira de; Bonilla,Oriel Herrera; Edson-Chaves,Bruno; Castro,Marina Arruda de; Sampaio,Valéria da Silva.
Abstract Eugenia luschnathiana (O.Berg) Klotzsch ex B.D.Jacks. (Myrtaceae) species, commonly known as pitomba-da-baía, occurs in Restinga region in the state of Ceara and has medicinal potential. The present study aimed to characterize the anatomy of E. luschnathiana leaves in the rainy and dry seasons, as well as in the sun and shade in the Restinga region of Ceara, aiming to generate useful information to understand the adaptive value of morphoanatomic responses to the natural conditions of occurrence of the species. Collections were performed at the State Botanical Park of Ceara, and leaves were completely expanded and fixed in FAA70, being replaced by 70% ethanol after 24 h. Samples were submitted to standard plant anatomy methodologies in order to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Myrtaceae; Pitomba-da-baía; Anatomical plasticity; Seasonality; Luminosity.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000400201

Ecological anatomy of Eugenia punicifolia (Kunth) DC. (MYRTACEAE) in the restinga region,state of Ceará
Provedor de dados: 94
Autores: Lemos,Viviane de Oliveira Thomaz; Lucena,Eliseu Marlônio Pereira de; Bonilla,Oriel Herrera; Edson-Chaves,Bruno.
Abstract  The species Eugenia punicifolia (Kunth) DC. (myrtle) occurs in the coastal region of the state of Ceará and has ecological and medicinal importance. This study aimed to characterize the leaf anatomy of myrtle (E. punicifolia) in the rainy and dry seasons, as well as in the sun and shade in the restinga region of the state of Ceará and to contribute to the understanding of the morphoanatomic variations in response to the natural conditions of the occurrence of this species. For this, collections of fully expanded leaves were performed at the Botanical Park of Ceará and fixed in FAA70, being replaced by 70% ethanol after 24 hours. The usual anatomical procedures were then performed in order to qualitatively and quantitatively analyze the leaf...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal vegetation; Myrtle; Anatomical plasticity; Seasonality; Luminosity.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000600203

Species composition and temporal activity of Arctiinae (Lepidoptera: Erebidae) in two cerrado vegetation types
Provedor de dados: 103
Autores: Scherrer,Scheila; Ferro,Viviane G.; Ramos,Marina N.; Diniz,Ivone R.
Arctiinae moths include nearly 11,000 species worldwide, of which approximately 700 species occur in the Brazilian Cerrado. The aim of this study was to describe the species composition of Arctiinae, as well as the variation in annual and nightly moth activity, in two Cerrado vegetation types. We sampled moths one night per month from September 2008 to June 2009, in the gallery forest and in the cerrado sensu stricto in the Jardim Botânico de Brasília. We collected 395 tiger moths belonging to 65 morphospecies; 74% of the species belonged to the tribe Arctiini and 26% to Lithosiini. Thirty-one species (47.7%) occurred only in the gallery forest, 13 (20%) occurred only in the cerrado sensu stricto, and 21 (32.3%) occurred in both vegetation types....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado sensu stricto; Gallery forest; Moths; Seasonality; Time of activity.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000200010

Do natural disturbances have significant effects on sandy beach macrofauna of Southeastern Brazil?
Provedor de dados: 103
Autores: Costa,Leonardo Lopes; Machado,Phillipe Mota; Zalmon,Ilana Rosental.
ABSTRACT The role of morphodynamic features such as grain size, swash climate and wave action on the macrofauna of beaches are well-known. However, few studies have investigated natural disturbances as potential drivers of temporal community variations. In southeastern Brazil, we sampled the intertidal macrofauna of two sandy beaches to test whether seasonal disturbances as the frequency of storm wave events (SWE) and rainfall have significant influence on their composition and abundance. The macrofauna assemblage differed significantly between the rainy and the dry seasons, but rainfall was not the main driver of community changes, although both beaches are in the vicinity of extensive river plumes. Actually, SWE explained most macrofauna richness...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Community structure; Benthic community; Intertidal; Morphodynamics; Seasonality.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702019000100321

What are the main local drivers determining richness and fishery yields in tropical coastal fish assemblages?
Provedor de dados: 103
Autores: Souza,Cynthia D.; Batista,Vandick S.; Fabré,Nidia N.
ABSTRACT Seasonal ecological effects caused by temperature and photoperiod are typically considered minimal in the tropics. Nevertheless, annual climate cycles may still influence the distribution and abundance of tropical species. Here, we investigate whether seasonal patterns of precipitation and wind speed influence the structure of coastal fish assemblages and fishing yields in northeast Brazil. Research trips were conducted during the rainy and dry seasons using commercial boats and gear to sample the fish community. Diversity was analyzed using abundance Whittaker curves, diversity profiles and the Shannon index. Principal Component Analysis (PCA) was used to analyze associations between the abundance of species and various environmental variables...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Artisanal fishing; Fishes; Wind; Precipitation; Seasonality; Gillnet.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702018000100304

Influence of the river flow on the structure of fish assemblage along the longitudinal gradient from river to reservoir
Provedor de dados: 103
Autores: Santos,Alex Braz Iacone; Terra,Bianca de Freitas; Araújo,Francisco Gerson.
Changes in fish assemblage structure along a longitudinal gradient of the Paraíba do Sul River and Funil reservoir were studied to detect distribution patterns and the seasonal influence of the inflowing river. Fish were caught by gill nets in three zones (riverine, transition and lentic) during two seasons (dry and wet). A total of 3,721 individuals were captured, comprising five orders, 14 families, 27 genera and 33 species. Five species were non-native and amounted to 17.7% of the total number of individuals. The 10 most abundant species were used to assess spatial-temporal patterns. Plagioscion squamosissimus (Heckel, 1840), Oligosarcus hepsetus (Curvier, 1829) and Metynnis maculatus (Kner, 1858) were widely distributed in both seasons. Astyanax...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dam; Fish diversity; Paraíba do Sul River; Seasonality.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000500010

Population ecology of small rodents and marsupials in a semi-deciduous tropical forest of the southeast Pantanal, Brazil
Provedor de dados: 103
Autores: Andreazzi,Cecilia S. de; Rademaker,Vitor; Gentile,Rosana; Herrera,Heitor M.; Jansen,Ana M.; D'Andrea,Paulo S.
The Pantanal is a South American biome characterized by extensive plains and stark environmental seasonality. Several habitats are subject to annual flooding, forcing small mammal species to aggregate in dry forest patches, which most likely influences their population dynamics and life history strategies. In order to investigate the seasonal influence on the life history traits of these small mammals, we conducted a 2-year mark-recapture study in the southeastern region of the Brazilian Pantanal (Nhecolândia) and analyzed the population dynamics of the most abundant small mammal species with the jackknife estimator. A trapping effort of 21,560 trap-nights resulted in 615 individuals in 1,171 captures (success = 5.43%). Three species of rodents - Oecomys...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gracilinanus agilis; Oecomys mamorae; Population dynamics; Seasonality; Small mammal; Thrichomys pachyurus.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000600009

Ecology of the snake Atractus paraguayensis (Dipsadidae) in southern Brazil
Provedor de dados: 103
Autores: Zanella,Noeli; D’Agostini,Fernanda.
ABSTRACT Knowledge of snake ecology is important to support conservation strategies. Atractus paraguayensis Werner, 1924 is a dipsadidae with semi fossorial habits distributed throughout southern Brazil. We analyzed the morphology, seasonality and reproductive biology of this species in a subtropical area in southern Brazil by combining material from scientific collections and field data. We found that females have a larger body size than males and that the reproductive cycle of females is seasonal, with vitellogenesis occurring in the warmer months of the year. Males exhibited no differences in testicle volume throughout the year; however, mating likely occurs in the spring when males are more active. Recruitment of newborns occurs in late summer. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Activity patterns; Reproduction; Seasonality; Subtropical region.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702018000100314

Evidence of vertical migration in the Ipanema bat Pygoderma bilabiatum (Chiroptera: Phyllostomidae: Stenodermatinae)
Provedor de dados: 103
Autores: Esbérard,Carlos E. L.; Lima,Isaac P. de; Nobre,Pedro H.; Althoff,Sérgio L.; Jordão-Nogueira,Tássia; Dias,Daniela; Carvalho,Fernando; Fabián,Marta E.; Sekiama,Margareth L.; Sobrinho,Artur Stanke.
Migration is defined as a seasonal and cyclic population movement observed in all animal classes and studied mainly in vertebrates. A considerable part of the knowledge on migration comes from birds, for which migration is an important aspect of their biology. In the case of bats, females usually migrate larger distances than males in some species. The present study analyzes the seasonal occurrence of Pygoderma bilabiatum (Wagner, 1843) at different elevations, in order to test for a pattern that evidences migration, using data from the states of Espírito Santo, Minas Gerais, Rio de Janeiro, São Paulo, Paraná, Santa Catarina, and Rio Grande do Sul, Brazil. A total of 529 specimens of P. bilabiatum were captured. Pygoderma bilabiatum seems to be more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Brazil; Capture efficiency; Seasonality; Temperature.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000600004

Use of food resources by small fish species in Neotropical rivers: responses to spatial and temporal variations
Provedor de dados: 103
Autores: Silva,Jislaine Cristina da; Gubiani,Éder André; Delariva,Rosilene Luciana.
Spatial and temporal variations in food supply play a crucial role in the determination of the patterns of food use by fish species. This study evaluated spatial and temporal variations in food utilization by small fish species of the Verde River, Upper Paraná River Basin, state of Mato Grosso do Sul, Brazil. Samplings were conducted in the rainy and dry periods, from November 2010 to August 2012, using trawls, cast nets and gillnets, in nine sampling sites grouped into three biotopes: upstream and downstream of the Branca Waterfall, and tributary. The stomach contents of 3,263 individuals of 12 small species were examined according to the volumetric method. Altogether, 31 food items were identified. Overall seed consumption was greater in the rainy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allochthonous resources; Diet; Fish fauna; Seasonality; Upper Paraná River Basin.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000500004

Diet and trophic guilds of fish assemblages in two streams with different anthropic impacts in the northwest of Paraná, Brazil
Provedor de dados: 103
Autores: Bonato,Karine Orlandi; Delariva,Rosilene Luciana; Silva,Jislaine Cristina da.
In the present study, we describe the diets of the fish assemblages in two streams in the Maringá region of Paraná that are under the influence of different anthropic impacts. We also evaluate how the origin and use of food resources varies temporally and spatially and how the trophic organization of the fish assemblages differs between the two streams. Fish were collected every two months from October 2006 to October 2007 using sieves, seining and closing nets along two 50 m stretches of each stream. We used the volumetric method to analyze the stomach contents of 599 fish belonging to 15 species. We then employed ANOSIM, SIMPER, NMDS and cluster analyses (using the Bray-Curtis index) to examine how different factors (species, stream, sampling site and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Food resources; Seasonality; Spatial variation; Urbanization.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702012000100004

Seasonal variation in the behavior of captive alpine musk deer, Moschus sifanicus, in Xinglongshan Musk Deer Farm, of China
Provedor de dados: 103
Autores: Xiaofeng,Luan; Changjie,Zhao; Cenyi,Hui; Xiuxiang,Meng.
Musk deer farming has the potential to be an effective conservation tool for the protection of musk deer as well as the production of valuable musk. To be successful, this requires a thorough understanding of the behavior of captive musk deer in order to improve their reproductive success and management. Between August 2005 to January 2006, the behavior sampling of 19 male and 13 female captive alpine musk deer, Moschus sifanicus Büchner, 1891, was used to examine the durations of twelve behavioral characteristics during the pre-rut (August to October) and rut seasons (November to January). Both males and females exhibited some seasonal variation in behavior. Males rested and fed more during the pre-rut than the rut and spent more time walking, fighting,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Behavior; Captivity; Seasonality.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000600002

Seasonal variation of ground spiders in a Brazilian Savanna
Provedor de dados: 103
Autores: Mineo,Marina Farcic; Del-Claro,Kleber; Brescovit,Antonio Domingos.
The Brazilian Savanna Ecoregion (Cerrado) is one of the richest biomes in the world, with a characteristic highly seasonal climate a dry season between May and September and a rainy season from October through April. Ground-dwelling spiders from three Cerrado phytophysiognomies, "campo cerrado", "cerrado" and "cerradão", were sampled using pitfall traps during two years, totaling 111 species and 3,529 individuals. The abundance of individuals and species richness was higher during the wet season. Fifty-eight species were captured exclusively during that period, whereas only nineteen were restricted to the dry season. Only two species were found in all samples. The number of juveniles was higher than the number of adults in all phytophysiognomies and in all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Araneae; Brazil; Community ecology; Seasonality.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000300006

Seasonal variation in the leaf-litter frog community (Amphibia: Anura) from an Atlantic Forest Area in the Salto Morato Natural Reserve, southern Brazil
Provedor de dados: 103
Autores: Santos-Pereira,Manuela; Candaten,Adriane; Milani,Douglas; Oliveira,Frederico B.; Gardelin,Joana; Rocha,Carlos F. D. da.
In this study we provide the first data regarding community parameters of leaf-litter anurans inhabiting a forest floor in the state of Paraná, southern Brazil, including information on community species richness, composition, specific density and biomass. Our study was conducted at Salto Morato Natural Reserve using forty plots of 4 x 4 m for each one of the four seasons (winter, spring, summer and autumn), totaling 2.560 m² of forest floor sampled. We sampled a total of 96 frogs inhabiting the forest floor, belonging to seven species: Brachycephalus hermogenesi (Giaretta &amp;amp; Sawaya, 1998), Ischnocnema guentheri (Steindachner, 1864), Haddadus binotatus (Spix, 1824), Leptodactylus gr. marmoratus, Physalaemus spiniger (Miranda-Ribeiro, 1926),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Rainforest; Density; Richness; Seasonality.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000600008

Spider assemblage (Arachnida: Araneae) associated with canopies of Vochysia divergens (Vochysiaceae) in the northern region of the Brazilian Pantanal
Provedor de dados: 103
Autores: Battirola,Leandro D.; Batistella,Daniel A.; Rosado-Neto,Germano H.; Brescovit,Antonio D.; Marques,Marinêz I.
ABSTRACT This study describes the composition and temporal variation of the spider assemblage (Arachnida: Araneae) associated with canopies of Vochysia divergens Pohl. (Vochysiaceae) in the northern region of the Brazilian Pantanal. Three V. divergens plants were sampled in 2004, at each seasonal period of the northern Pantanal (high water, receding water, dry season and rising water), using thermonebulization of the canopies with insecticide, totaling 396 m2 of sampled canopies. Analysis of abundance and richness of spider families were based on Non-Metric Multidimensional Scaling (NMDS) and Variance Analysis (ANOVA and MANOVA). A total of 7,193 spiders were collected (6,330 immatures; 88.0%; 863 adults, 12.0%) distributed in 30 families. Araneidae (1,676...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Invertebrates; Diversity; Forest canopy; Seasonality; Wetlands.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702016000400700

Diet of the lizard Ecpleopus gaudichaudii (Gymnophthalmidae) in Atlantic Rainforest, state of Rio de Janeiro, Brazil
Provedor de dados: 103
Autores: Maia,Thiago; Almeida-Gomes,Mauricio; Siqueira,Carla C.; Vrcibradic,Davor; Kiefer,Mara C.; Rocha,Carlos Frederico D.
In this study we analyzed the diet of the gymnophthalmid lizard Ecpleopus gaudichaudii Duméril &amp;amp; Bibron, 1839, a typical inhabitant of the forest-floor leaf litter, in an Atlantic Forest area in the state of Rio de Janeiro, southeastern Brazil. The 26 individuals sampled during the study had a mean snout-vent length (SVL) of 36.2 ± 4.2 mm and a mean jaw width (JW) of 4.1 ± 0.5 mm. We did not find differences in SVL between males and females, though the sexes differed in JW when the effect of body size was factored out, with females presenting higher values. The diet of the lizards was composed exclusively of arthropods, especially isopods and orthopterans. The similarity in trophic niches among seasons (volumetric and numerical proportions of prey...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Lacertilia; Rainforest; Seasonality; Squamata.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000500006

Feeding habit of the Brazilian tapir, Tapirus terrestris (Perissodactyla: Tapiridae) in a vegetation transition zone in south-eastern Brazil
Provedor de dados: 103
Autores: Talamoni,Sônia A.; Assis,Miguel A. C.
Tapirs are considered generalist herbivores and the differences in the proportions of dietary items are often attributed to differences in the habitats where individuals live. This study characterized the feeding habit of Tapirus terrestris (Linnaeus, 1758) in a nature reserve in south-eastern Brazil, located in a region considered a transition zone between the Cerrado (Brazilian savanna) and the Atlantic Forest biomes. Fecal samples from T. terrestris individuals were collected monthly at six sampling areas that encompassed a total of 242.22 ha. There were 147 fresh samples found (77 during the dry season and 70 during the wet season). The diet of the tapirs in this reserve was characterized by the prevalent browsing on leaves and stems. There was a low...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Psidium; Seasonality; Serra do Caraça.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000200007

No mullet, no gain: cooperation between dolphins and cast net fishermen in southern Brazil
Provedor de dados: 103
Autores: Santos,Mauricio L.; Lemos,Valéria M.; Vieira,João P.
ABSTRACT We report on the interaction between common bottlenose dolphins, Tursiops truncatus (Montagu, 1821) and cast net fishermen in southern coast of Brazil. The fishery was monitored in the mouth of the Tramandaí River Estuary to investigate the seasonality of catches and their relationships with a set of variables: presence/absence and number of bottlenose dolphins, fishing area, temperature, salinity, wind and water flow direction in the channel. The mullet, Mugil liza Valenciennes, 1836 is the target species and was the dominant fish in the catches (77% of total catch; 50% in frequency; 0.2 ind. x f-1). The use of GLM models helped to reveal that the number of the bottlenose dolphins, time of year (months) and spatial variation of fishing activity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fishing activity; Generalized linear models; Mugil liza; Seasonality; Tramandaí River Estuary; Tursiops truncatus.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702018000100340

Temporal variations of Collembola (Arthropoda: Hexapoda) in the semiarid Caatinga in northeastern Brazil
Provedor de dados: 103
Autores: Ferreira,Aila Soares; Bellini,Bruno Cavalcante; Vasconcellos,Alexandre.
The richness and abundance of Collembola species can be influenced by many biotic and abiotic factors, mainly humidity. The semiarid region of Brazil is dominated by Caatinga dryland vegetation which experiences distinct seasonal alterations of its physiognomy linked to regional rainfall regimes. The present study evaluated the environmental factors affecting populations of Collembola in an area of Caatinga vegetation in Northeastern Brazil during a 12-months period. Specimens were collected by active searching in ten 20 x 20 m plots, with a sampling effort of 1 hour/person/plot. A total of 1231 specimens were collected, comprising 15 morphospecies, 12 genera, and nine families. Both species richness and individual abundances demonstrated oscillations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Climatic variables; Edaphic fauna; Seasonality; Species richness.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000600008

Seasonal variations in scorpion activities (Arachnida: Scorpiones) in an area of Caatinga vegetation in northeastern Brazil
Provedor de dados: 103
Autores: Araújo,Cristiane S.; Candido,Denise M.; Araújo,Helder F. P. de; Dias,Sidclay C.; Vasconcellos,Alexandre.
Seasonal variations in scorpion activity were investigated during a 24 month period in an area of Caatinga (dryland) vegetation in the state of Paraíba, Brazil. The total number of scorpions captured was correlated with climatic variables and prey abundance. Scorpions were captured monthly using pitfall traps; their potential prey was captured using malaise, beating trays and pitfalls. A total of 104 scorpions were captured, representing four species: the bothriurids Bothriurus asper (Pocock, 1893) (n = 74; 71.2%) and B. rochai (Mello-Leitão, 1932) (n = 20; 19.2%), and the buthids Rhopalurus rochai (Borelli, 1910) (n = 4; 3.8%) and Tityus stigmurus (Thorell, 1876) (n = 1; 1.0%). The sex ratios (male:female) of the two most abundant species were 14:1 for B....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental factors; Neotropical region; Reproduction; Semi-arid; Seasonality.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000300008

Frequency of estrus in Santa Inês, Texel and Ile de France ewes in the northwest of Paraná State, Brazil
Provedor de dados: 96
Autores: Moraes,Gentil Vanini de; Macedo,Francisco de Assis Fonseca de; Lourenço,Fábio José; Macedo,Filipe Gomes de; Rigolon,Luiz Paulo; Nogueira,Guilherme de Paula; Santello,Graziela Aparecida.
The incidence of estrus in nulliparous Santa Inês (n = 16), Texel (n = 16) and Ile de France (n = 15) ewes fed two levels of crude protein (CP, 12 or 16%) was monitored from July 2005 to December 2006, and seasonality in the Santa Inês breed in the south of Brazil was characterized. The solar radiation data were recorded daily, and samples of blood were collected biweekly for determination of the plasma concentration of progesterone in Santa Inês lambs at, on average, 11±1 months of age. The female Santa Inês lambs, in the experimental period, stayed among teaser rams with a powdered-dye-ink mixture placed on their chest to mark the females that accepted to be mounted. Santa Inês ewes did not manifest estrus in the first fortnight of November and in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photoperiodic; Progesterone; Reproduction; Seasonality.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013001000003

Seasonal variation, method of determination of bovine milk stability, and its relation with physical, chemical, and sanitary characteristics of raw milk
Provedor de dados: 96
Autores: Machado,Sandro Charopen; Fischer,Vivian; Stumpf,Marcelo Tempel; Stivanin,Sheila Cristina Bosco.
ABSTRACT The objective of this research was to determine the variation of milk stability evaluated with ethanol, boiling, and coagulation time tests (CTT) to identify milk components related with stability and verify the correlation between the three methods. Bulk raw milk was collected monthly at 50 dairy farms from January 2007 to October 2009 and physicochemical attributes, somatic cell (SCC), and total bacterial counts (TBC) were determined. Milk samples were classified into low, medium, and high stability to ethanol test when coagulation occurred at 72 °GL, between 74 and 78 °GL, and above 78 °GL, respectively. Univariate analysis was performed considering the effects of year, months, and interaction in a completely randomized design. Principal factor...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milk composition; Seasonality; Somatic cell count.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000400340

Chemical composition and photosynthetically active radiation of forage grasses under irrigation
Provedor de dados: 96
Autores: Silva,Edilane Aparecida da; Silva,Wilson Jesus da; Barreto,Antônio Carlos; Oliveira Junior,Antonio Barbosa de; Paes,José Mauro Valente; Ruas,José Reinaldo Mendes; Queiroz,Domingos Sávio.
The present study aimed to estimate the photosynthetically active radiation of tropical forage grasses in ten cutting dates, under irrigation. The following treatments were used: Brachiaria decumbens grass (Brachiaria decumbens cultivar Basilisk), Marandu grass (Brachiaria brizantha cultivar Marandu), Xaraes grass (Brachiaria brizantha, cultivar Xaraes), Mombaça grass (Panicum maximum cultivar Mombaça), Tanzania grass (Panicum maximum, cultivar Tanzania) and Tifton 85 grass (Cynodon spp cultivar Tifton 85). The weather parameters were collected by an automatic meteorological station installed in the location and used for irrigation management. The experiment was arranged in a split-plot completely randomized block design, considering the grasses as plots...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forage production; Growth; Seasonality; Vegetation dynamics; Weather.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000300015

Evaluation of mathematical models to describe growth of grazing young bulls
Provedor de dados: 96
Autores: Fernandes,Henrique Jorge; Tedeschi,Luis Orlindo; Paulino,Mário Fonseca; Detmann,Edenio; Paiva,Luisa Melville; Valadares Filho,Sebastião de Campos; Silva,Aline Gomes da; Azevêdo,José Augusto Gomes.
The objective of this study was to evaluate the use of different mathematical models to describe growth of grazing beef cattle. Data of 20 Nellore bulls with initial weight of 129±28.1 kg and final weight of 405±62.0 kg were used. The animals were randomly divided into four plots and placed on B. decumbens Stapf pastures. Three plots received concentrate supplement with different protein profiles and the fourth plot received only mineral supplement. Animals were weighed every 28 days to design growth curve of full body weight. Five mathematical models were evaluated to describe animal growth: Multiphase, Linear, Logarithmic, Gompertz and Logistic models. Assessment of adequacy of the models was performed by using coefficient of determination, simultaneous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grazing beef cattle; Modeling; Seasonality.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200020

Dry matter yield, thermal sum and base temperatures in irrigated tropical forage plants
Provedor de dados: 96
Autores: Silva,Edilane Aparecida da; Silva,Wilson Jesus da; Barreto,Antônio Carlos; Oliveira Junior,Antonio Barbosa de; Paes,José Mauro Valente; Ruas,José Reinaldo Mendes; Queiroz,Domingos Sávio.
The present study aimed to estimate the basal temperature and thermal sum for the following tropical forage plants: Brachiaria decumbens, cultivar Basilisk; Brachiaria brizantha, cultivar Marandu; Brachiaria brizantha, cultivar Xaraes; Panicum maximum, cultivar Mombaça; Panicum maximum, cultivar Tanzania; and Cynodon spp, cultivar Tifton 85, in ten cutting seasons, under irrigation. The climatic data were collected in an automatic weather ministration installed in the experimental area and used for irrigation management. The relative development or regression equation method was used to calculate the basal temperature. The estimated basal temperature values were 15.4; 10.5; 14.2; 13.4; 12.4 and 15.1 ºC and the demands were of 2,088.1; 3,542.5; 2,486.5;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degree-days; Relative development; Seasonality production; Seasonality; Threshold temperature; Vegetation dynamics.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000300014

Phenological synchrony between the austral thrush Turdus falcklandii (Passeriformes: Turdidae) and its food resources within forests and prairies in southern Chile
Provedor de dados: 97
Autores: Orellana,José I; Smith-Ramírez,Cecilia; Rau,Jaime R; Sade,Soraya; Gantz,Alberto; Valdivia,Carlos E.
BACKGROUND: Frugivorous birds are phenologically linked to the fruits that they eat. When there is less fruit in seasonal environments, frugivorous birds complement their diet by eating invertebrates. The depth of the phenological link between frugivorous birds and their dietary resources has not been studied until now. The objective was to determine the possible phenological synchrony between the Austral thrush (Turdus falcklandii) and its dietary resource, fruits and annelids, found in the fragmented forests in the South of Chile. RESULTS: The numbers of thrushes, annelids, and fruits in fragments of native forest and anthropogenic grassland in Chile's Lake District were estimated annually. Spatial variation (i.e., forest and grassland) and seasonal...
Tipo: Journal article
Palavras-chave: Annelids; Fleshy fruit; Phenology; Seasonality; Turdus.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100010

Daily and seasonal limits of time and temperature to activity of degus
Provedor de dados: 97
Autores: KENAGY,G.J.; NESPOLO,ROBERTO F.; VÁSQUEZ,RODRIGO A.; BOZINOVIC,FRANCISCO.
We present an analysis of behavioral flexibility in a day-active caviomorph rodent, the degu, Octodon degus, in response to temporal (daily and seasonal), spatial, and thermal heterogeneity of its environment. We quantified activity and foraging behavior in a population, together with thermal conditions, in an open habitat in the seasonally hot and arid matorral of central Chile. Summer activity was bimodal, with a gap of more than 8 h between the morning bout of 2.5 h of intensive foraging and the afternoon bout of 2 h. More than half of the 4.5 h of summer activity occurred in the shade of early morning or late afternoon when the sun was below the local skyline. Autumn and spring activity were also bimodal, but with greater proportions of activity under...
Tipo: Journal article
Palavras-chave: Foraging; Seasonality; Thermal ecology; Forrajeo.
Ano: 2002
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000300008

Seasonal variability of the antimicrobial activity of the essential oil of Lippia alba
Provedor de dados: 124
Autores: Machado,Terezinha Feitosa; Pereira,Rita de Cássia Alves; Batista,Valéria Chaves Vasconcelos.
Lippia alba is a shrub of the Verbenaceae family, popularly known as lemon balm. It's essential oil is said to have broad-spectrum antimicrobial activity whose effectiveness varies according to its composition, which is influenced by both biotic and abiotic factors. The present study aimed to evaluate the antimicrobial effectiveness of oil taken from the leaves of L. alba collected at different times of the year, against microorganisms of importance in food. The oil, obtained by hydrodistillation, was tested against standard cultures of Pseudomonas aeruginosa, Salmonella choleraesuis, Escherichia coli, Staphylococcus aureus, Listeria monocytogenes and Listeria innocua using agar diffusion techniques. The different sampling times had a big influence on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lippia alba; Antimicrobial activity; Seasonality.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000300011

Annual characteristics of estrous activity in wool and hair ewe lambs under subtropical conditions
Provedor de dados: 63
Autores: Rodrigues,Paula de Almeida; Coelho,Lia de Alencar; Nonaka,Keico Okino; Sasa,Aya; Vicente,Wilter Ricardo Russiano; Balieiro,Júlio César de Carvalho; Siqueira,Edson Ramos de.
The increased emphasis placed on lamb production in Brazil points to the need for a better knowledge of the annual pattern of reproductive activity in ewe lambs. This study evaluates the annual estrous activity pattern of hair and wool ewe lambs raised in southeast Brazil. Estrous characteristics were recorded for 12 months in ten Santa Inês and 21 Romney Marsh and Suffolk ewe lambs. Santa Inês ewe lambs exhibited a greater length of the normal estrous cycle (14 to 19 days) than Romney Marsh and Suffolk ewe lambs (17.0 ± 0.1 days vs. 16.5 ± 0.2 and 15.9 ± 0.2 days). All the ewe lambs presented a greater number of periods of estrus per animal per month for single estrous cycles (up to 26 days) during autumn and winter. During spring and summer there was a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breeds; Estrous cycle; Sheep; Subtropics; Seasonality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500003

Sazonalidade de três espécies de Syrphidae (Insecta, Diptera) capturadas com armadilha Malaise no Estado do Paraná, Brasil
Provedor de dados: 104
Autores: Marinoni,Luciane; Bonatto,Sionei Ricardo.
The project "Survey of the Entomolo-gical Fauna in Paraná" (PROFAUPAR) was carried out in eight localities of Paraná, Brazil, during two years. In the first year a total of 1.607 specimens of Syrphidae were collected with Malaise trap. The species Toxomerus tibicen (Wiedemann, 1830), Microdon milis Curran, 1940 and Leucopodella gracilis (Williston, 1891) were the most abundant. The abundance and seasonality of each species are evaluated.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diptera; Syrphidae; Abundance; Seasonality; Malaise trap; Paraná; Brazil.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000100007

Abundância e sazonalidade das espécies de Hydropsychidae (Insecta, Trichoptera) capturadas em armadilha luminosa no Estado do Paraná, Brasil
Provedor de dados: 104
Autores: Marinoni,Luciane; Almeida,Gisele Luziane de.
During one year of the project called "Survey of the Entomological Fauna in Paraná State" (henceforth PROFAUPAR), 126,340 adult specimens of Trichoptera were collected with light trap. The individuais of the family Hydropsychidae were identified and a list of species is presented. Eighteen species in four genera were identified. From this, S. (R.) discalis Flint, 1972,5. (R.) paramnsis Flint, 1983;S (R.) spinulosa Flint, 1972 are for the first time registered for Brazil and Leptonema sparsum (Ulmer, 1905), Macrostemum hyalinum (Pictet, 1836), S. (Smicridea) albosignata Ulmer, 1907; S. (Rhyacophylax) dentifera Flint, 1983; S. (R.) iguazu Flint, 1983; S. (R.) piraya Flint, 1983; S. (R.) unguiculaia Flint, 1983; S. (R.) vermiculata Flint, 1978 and S. (R.)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichoptera; Hydropsychidae; Abundance; Seasonality; Species rich-ness; Light trap; Paraná; Brazil.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000100025

Abundância e sazonalidade das espécies de Leptoceridae (Insecta, Trichoptera) capturadas com armadilha luminosa no Estado do Paraná, Brasil
Provedor de dados: 104
Autores: Almeida,Gisele Luziane de; Marinoni,Luciane.
From 126,340 adult specimens of Trichoptera captured with light trap during one year of the project called "Survey of the Entomological Fauna in Paraná State" (Paraná, Brazil), 6,375 belong to the family Leptoceridae. The individuals of the family were identified and a list of species is presented. The following species are recorded for the first time to Paraná State: Achoropsyche duodecimpunctata (Navas. 1916); Nectopsyche aureovittala Flint, 1983; Nectopsyche fuscomaculata Flint, 1983; Nectopsyche muhni (Navas, 1916); Nectopsyche separata (Banks, 1920); Nectopsyche ortizi Holzenthal, 1995; Nectopsyche splendida (Navas, 1917) and Tripleclides gracilis (Burmeister, 1839). Discussion on individual abundance and species seasonality are also presented.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichoptera; Leptoceridae; Abundance; Seasonality; Species richness; Light trap; Paraná; Brazil.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000200005

Atividade reprodutiva de Scinax rizibilis (Bokermann) (Anura, Hylidae) na Floresta Atlântica, sudeste do Brasil
Provedor de dados: 104
Autores: Bastos,Rogério P; Haddad,Célio F. B.
The breeding activity of Scinax rizibilis (Bokermann, 1964) was observed in a temporary pond, in the municipality of Ribeirão Branco, in the Southern São Paulo State from February 1993 to January 1994 and November 1994 to February 1995. The reproductive season extended from September to February. Females were larger and heavier (after oviposition) than males. In the choras, the spatial distribution tended towards uniformity. The number of males and females in the chorus was positively correlated. However there was no correlation between the number of males and the estimation of the operational sex ratios. On average there were seven males for each female present in the chorus. The males were apparently selected by females.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hylidae; Scinax rizibilis; Reproduction; Sexual selection; Spatial distribution; Seasonality.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000200007

Mysoria affinis (Herrich-Schäffer): morphological variation and synonymy (Lepidoptera, Hesperiidae, Pyrrhopyginae)
Provedor de dados: 104
Autores: Warren,Andrew D.; Mielke,Olaf H. H.
Mysoria wilsoni H.A. Freeman, 1969, is established as a new junior synonym of Mysoria affinis (Herrich-Schäffer, 1869). A lectotype for Pyrrhopyga [sic] affinis Herrich-Schäffer, 1869 is designated.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Guatemala; Mexico; Neotropical; Seasonality; Type specimens.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752004000200025

Importância de diferentes microhabitats no comportamento de forrageio por presas do mico-leão-preto, Leontopithecus chrysopygus (Mikan) (Mammalia, Callitrichidae)
Provedor de dados: 104
Autores: Passos,Fernando C.; Alho,Cleber J. R.
Prey foraging behavior in the Black Lion Tamarin, Leontopithecus chrysopygus (Mikan, 1823) was observed in the Caetetus Ecological Station, southeastern Brazil, during 550 hours of direct observations between December 1993 and February 1995. The scan sampling method was used to gather data. These tamarins use manipulative, specific-site foraging behavior. When searching for animal prey items, they examine a variety of microhabitats. The most important microhabitat used for prey foraging behavior was tree cavities (41% of the foraging observations), but palm trees (22%), bamboo (12%), vines (11%), bark (5%), seed pods of the "jequitiba" tree (4%), other places (3%) and epiphytes (2%) were also observed. Animal preys were frequently captured in understory...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mammalia Leontopithecus chrysopygus; Black lion tamarin; Foraging behavior; Microhabitats; Seasonality; Primates.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000500029

Stonefly (Plecoptera) fauna of streams in a mountainous area of Central Brazil: abiotic factors and nymph density
Provedor de dados: 104
Autores: Bispo,Pitágoras da Conceição; Froehlich,Cláudio Gilberto; Oliveira,Leandro Gonçalves.
The stonefly (Pleeoptera) nymphs of streams of the Almas River basin, Pirenópolis, Goiás State, Central Brazil, and some abiotie factors that might affect their temporal distribution were studied. Nymphs were sampled monthly (June 1993 to July 1994) in five stations with a Surber sampler, and each sample consisted of 20 units totalling 2 m². In each station, stream velocity, discharge, temperature, electrical conductivity and pH were measured in order to assess their influence on the density of nymphs. Nymphs were identified to genus level. In general, the annual variation in density of nymphs, in four stations, showed that the seasonal variation was not clearly influenced by the annual rain cycle. In the case of the one of the stations, where numbers of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pleeoptera; Nymphs; Central Brazil; Abiotie factors; Seasonality.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000500026

Diet of crab-eating fox, Cerdocyon thous (Linnaeus) (Carnivora, Canidae), in a suburban area of southern Brazil
Provedor de dados: 104
Autores: Pedó,Ezequiel; Tomazzoni,Ana C.; Hartz,Sandra M.; Christoff,Alexandre U.
The crab-eating fox, Cerdocyon thous (Linnaeus, 1766), is a small canid with twilight and nocturnal habits from savannas and forests of South America. In this study, we seasonally determined and quantified the diet of C. thous in Lami Biological Reserve, a conservation unit with 179.78ha situated in a suburban area in the municipality of Porto Alegre, southern Brazil. During the year 2000, we collected 80 fecal samples - 20 for each season - in two or three week sampling intervals, along trails inside the Reserve. Samples were dried in an oven for 24h at 60ºC, immersed in 70% alcohol, and prey items were identified using a stereomicroscope. The diet of the crab-eating fox was essentially carnivorous (87.62% composed by vertebrates), with seasonal variation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canids; Food habits; Rio Grande do Sul; Seasonality; South America.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752006000300005

Sazonalidade e horário de atividade de abelhas Euglossinae (Hymenoptera, Apidae), em florestas de terra firme na Amazônia Central
Provedor de dados: 104
Autores: Oliveira,Marcio Luiz de.
Euglossinae bee fauna of two areas of terra firme forest near Manaus, Amazonas, Brazil was compared. Over a twelve-month period collections were done fortnightly, between 7:00 a.m and 5:00 p.m, using traps with eight kinds of scent baits. The traps were placed in the understory and in tree crowns. The majority of species and specimens was most active between August-December, near the beginning of the rainy season in this region. The bees were most active from 9:00 a.m. until 4:00 p.m., while air temperatures were between 24.5-27ºC, but there was a decline in this activity when air temperature varied above or below of this range. There were differences in the seasonality and in the daily activity patterns for the two areas studied but these differences were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Orchid-bees; Euglossinae; Daily activity; Seasonality; Amazonia.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000100003

Bionomia de Monoeca xanthopyga Harter-Marques, Cunha &amp;amp; Moure (Hymenoptera, Apidae, Tapinotaspidini) no Planalto das Araucárias, Rio Grande do Sul, Brasil
Provedor de dados: 104
Autores: Cunha,Rodrigo da; Blochtein,Betina.
A study of the life history of the solitary bee Monoeca xanthopyga, was conducted at the Araucária Plateau, at the state of Rio Grande do Sul. The study focused the seasonality, sexual behavior, females activity during nest building, the exploited plant resources and the associated parasitoids. Three nest aggregations of M. xanthopyga built in clay soil with few plant cover or none at all, were studied on the Parque Nacional dos Aparados da Serra, located in Cambará do Sul, Rio Grande do Sul State. The nests were randomly distributed in areas up to eight square meters in size and reach a maximum density of 57 nests per square meter. The only one generation occurred from January to April. The immature stayed in diapausa in the prepupa stage during eight to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Floral rewards; Monoeca xanthopyga; Nest aggregations; Parasitoids; Reproductive behavior; Seasonality; Tapinotaspidini.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000100013

Stonefly (Plecoptera) fauna in a mountainous area of Central Brazil: composition and adult phenology
Provedor de dados: 104
Autores: Bispo,Pitágoras C.; Froehlich,Cláudio G.; Oliveira,Leandro G.
A survey of the stonefly (Plecoptera) fauna of streams of the Almas River basin, Pirenópolis, Goiás State, Central Brazil, is presented as well as data of some factors that could affeet the temporal distribution of the adults. For checking adult phenology, light sources were used in three stations from June 1993 to Jully 1994. The sampled individuais were identified to species or morphospecies, as possible. In this study, 301 individuais belonging to the perlid genera Anacroneuria Klapálek, 1909, Kempnyia Klapálek, 1916 and Macrogynoplax Enderlein, 1909 were collected. Adults of most species were collected along the studied period, except for those of Kempnyia that were restricted to the warm-rainy season, the same pattern for this genus in southeastern...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plecoptera; Central Brazil; Adult phenology; Seasonality.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000500025

Seasonality of Monomachus Klug (Hymenoptera, Monomachidae) in the Biological Reserve of Duas Bocas, Espírito Santo State, Brazil
Provedor de dados: 104
Autores: Azevedo,Celso Oliveira; Santos,Hélio Sá.
A survey of Monomachidae species was carried out in anarea of Atlantic rain forest of the Biological Reserve of Duas Bocas, Espírito Santo State, Brazil between September, 1996 and August, 1997. Two species of Mollomachus Klug, 1841, M. fuscator Perty, 1833 and M. eurycephalus Schletterer, 1890 were collected from May to September. Both species are typical of winter time and showed the same parttern of seasonality.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hymenoptera; Monomachidae; Monomachus; Seasonality; Neotropical.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000200010

Fine-root production in two secondary forest sites with distinct ages in Eastern Amazon
Provedor de dados: 36
Autores: Lima,Tâmara Thaiz Santana; Miranda,Izildinha Souza; Vasconcelos,Steel Silva.
The objective of this work was to assess the fine-root (≤ 2 mm diameter) production dynamics of two forest regrowths at different ages. Fine-root production was monitored by the ingrowth core method in one 18-year-old site (2 ha) and one 10-year-old site (0.5 ha), both localized in the Apeú region, Northern Pará State, Brazil. The sites were abandoned after successive shifting cultivation, beginning in 1940. Monthly production of live fine-root was similar between sites and was influenced by rainfall seasonality, with higher production during the dry season than the wet season for mass and length. However, mortality in terms of mass was higher in the 10-year-old site than in the 18-year-old site. The seasonality influenced mortality only in the 18-year old...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drought; Root biomass; Seasonality; Succession; Tropical forest.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672012000100012

Flood pulse and spatial dynamics of mercury in sediments in Puruzinho lake, Brazilian Amazon
Provedor de dados: 36
Autores: Almeida,Ronaldo de; Bernardi,José Vicente Elias; Oliveira,Ronaldo Cavalcante; Carvalho,Dario Pires de; Manzatto,Angelo Gilberto; Lacerda,Luiz Drude de; Bastos,Wanderley Rodrigues.
The study was conducted in Puruzinho lake (Humaitá, AM) considering seasonal periods of rainy and dry in way to elucidate the flood pulse importance in the deposition, remobilization and distributions of mercury and organic matter in bottom sediments in the Madeira River Basin (Brazilian Amazon). Bottom sediments and soils samples were analyzed for total mercury and organic matter. Mercury concentrations obtained in bottom sediment were 32.20-146.40 ng g-1 and organic matter values were 3.5 - 18.0%. The main region for accumulation of mercury and organic matter was in the central and deepest lake area In the rainy season there was a greater distribution of Hg and organic matter, mainly controlled by means of income of the Madeira river water during...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic matter; Indicator kriging; Madeira river; Seasonality.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000100010

Temporal distribution of fruit-feeding butterflies (Lepidoptera, Nymphalidae) in the eastern extreme of the Amazon region
Provedor de dados: 36
Autores: ARAUJO,Elias da Costa; MARTINS,Lucas Pereira; DUARTE,Marcelo; AZEVEDO,Gisele Garcia.
ABSTRACT Rainfall is one of the most influential factors driving insect seasonality in the Amazon region. However, few studies have analyzed the temporal dynamics of fruit-feeding butterflies in the Brazilian Amazon, specially in its eastern portion. Here, we evaluated the diversity patterns and temporal distribution of fruit-feeding butterflies in a remnant of eastern Amazon forest in the Baixada Maranhense, northeastern Brazil. Specifically, we tested whether fruit-feeding butterflies are temporally structured and whether rainfall influences species richness and abundance. Butterflies were collected with baited traps in both the rainy and dry seasons for two consecutive years. In total, we captured 493 butterflies belonging to 28 species, 15 genera and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian Amazon; Frugivorous butterflies; Maranhão; Seasonality; Temporal diversity; Tropical forest.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672020000100012

Seasonality of nematode larvae in Iguanodectes spilurus (Characidae) an ornamental fish from northeastern Para, Brazil
Provedor de dados: 36
Autores: Fujimoto,Rodrigo Yudi; Anjos,Ellem Cristina Silva dos; Ramos,Fabrício Menezes; Martins,Maurício Laterça.
The current study presents a parasitological survey of larval nematodes from freshwater ornamental fish Iguanodectes spilurus caught in the watercourse of the Caete River, in the northeast region of the State of Para, Brazil. A total of 176 specimens, 1.36±0.75 g weight and 5.53±0.98 cm total length, were analyzed. Nematode larvae were identified as Capillaria sp., Procamallanus sp. and Anisakidae, with prevalence of 70.45% and infection intensity ranging from 1.81 to 4.70 larvae. The highest prevalence 57.38% occurred in the liver, but no seasonality was observed, indicating high infection throughout the year. Seasonality was observed in fish parasitized in the stomach, intestine and caecum, with prevalence and mean intensity of 17.61% and 2.32 parasites,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characidae; Parasitology; Seasonality; River.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672013000400013

POPULATION FLUCTUATION OF Empoasca sp. (HEMIPTERA: CICADELLIDAE) IN A PHYSIC NUT CROP IN MATO GROSSO DO SUL
Provedor de dados: 37
Autores: de CARVALHO,Denisar Paggioli; de OLIVEIRA,Harley Nonato.
Physic nut (Jatropha curcas L.) is an oilseed, semi-evergreen shrub or small tree of the Euphorbiaceae family, whose seeds contain oil that can be processed into a high quality biofuel. However, there have been reports of arthropods feeding from its leaves, including the green leafhopper Empoasca sp. (Hemiptera: Cicadellidae). The large numbers of this insect, observed in certain periods of the year in many regions of Brazil, are causing damage to the oilseed crops. This study aims at evaluating the fluctuation in green leafhopper population in a physic nut crop in Dourados, Mato Grosso do Sul, to assess possible correlations with rainfall, maximum, average and minimum temperatures. This evaluation was conducted between March 2011 and July 2012. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jatropha curcas; Green leafhopper; Rainfall; Seasonality.
Ano: 2016
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2016000100008

The influence of El Niño and edge effects on the reproductive phenology and floral visitors of Eschweilera tetrapetala Mori (Lecythidaceae), an endemic species of the Atlantic Forest of northeastern Brazil
Provedor de dados: 39
Autores: Menezes,Isiara Silva; Couto-Santos,Ana Paula Lima do; Funch,Ligia Silveira.
ABSTRACT We compared the reproductive phenology and floral visitors of Eschweilera tetrapetala growing along the edge and in the interior of a submontane forest in the Chapada Diamantina mountains, Bahia State, Brazil. We sought to determine if there were inter-annual differences in intensity and seasonality associated with environmental conditions, and if there were differences in floral visitors between the two environmental contexts. Phenological observations were performed for three years, and included the occurrence of an El Niño event. We applied circular statistics to detect seasonal trends, performed cross correlations between phenophases and climate, Kruskal-Wallis and Wilcoxon signed-rank tests for inter-annual variation, and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: El Niño; Eschweilera tetrapetala; Floral visitors; Linear edge effects; Phenology; Precipitation; Seasonality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000100001

Phenodynamics of five orchids species growing on rock outcrops in the Chapada Diamantina Mountains in northeastern Brazil
Provedor de dados: 39
Autores: Santana,Karoline Coutinho de; Souza,Isys Mascarenhas; Miranda,Lia d'Afonsêca Pedreira de; Funch,Ligia Silveira.
ABSTRACT We evaluated the vegetative and reproductive phenological patterns of the orchids Cattleya elongata, Cyrtopodium aliciae, Epidendrum orchidiflorum, Epistephium lucidum, and Sobralia liliastrum (Orchidaceae) growing on sandstone outcrops in the Chapada Diamantina Mountains in northeastern Brazil. Phenological events were associated with abiotic factors, leaf longevity, life form, plant growth pattern, and pollination syndrome. Phenological observations were made for 18 months and followed the phenophases of: stem/pseudobulb emission, leaf flush, leaf fall, flowering, immature fruit and mature fruit. Seasonality, synchrony, and correlations between phenophases and environmental variables were tested. The orchid species demonstrated aseasonal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Campo rupestre; Flowering overlap; Photoperiod; Seasonality; Synchrony.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000300508

Do seedling functional groups reflect ecological strategies of woody plant species in Caatinga?
Provedor de dados: 39
Autores: Menezes,Tatiane Gomes Calaça; Rodal,Maria Jesus Nogueira; Lima,André Luiz Alves de; Lima,Lucivania Rodrigues; Pinto,Monalisa Alves Diniz S. C.; Melo,André Laurênio de.
ABSTRACT It is assumed that morphological traits of seedlings reflect different strategies in response to environmental conditions. The ecological significance of this has been widely documented in rainforests, where habitat structure and species interactions play an important role in community assembly. However, in seasonally dry ecosystems, where environmental filtering is expected to strongly influence community structure, this relationship is poorly understood. We investigated this relationship between functional groups of seedlings and life history traits and tested whether functional group predicts the ecological strategies employed by woody species to deal with the stressful conditions in seasonally dry ecosystems. Seedling functional groups, life...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dry forest; Environmental filtering; Functional traits; Initial establishment; Recruitment; Seasonality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000100020

Distribution, ecology, and reproduction of bryophytes in a humid enclave in the semiarid region of northeastern Brazil
Provedor de dados: 39
Autores: Batista,Wanessa Vieira Silva Menezes; Pôrto,Kátia Cavalcanti; Santos,Nivea Dias dos.
ABSTRACT The ready availability of water resources distinguishes the humid forest of Chapada do Araripe, Ceará State, Brazil, from the semiarid vegetation around it. The regional climate demonstrates a marked seasonality of rainfall that affects the ecological strategies of the species found there. We studied the bryophytes of the humid forest of Chapada do Araripe, analyzing their diversity, geographic distributions, and ecological and reproductive aspects. Bryophytes were collected from different substrates using the random-walk method. We gathered information concerning the geographic distribution, functional groups (life forms, light tolerance guilds, and habits) and reproductive aspects of each taxon. We found 76 bryophyte species, predominantly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mosses; Liverworts; Floristics; Enclave forest; Seasonality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000200303

Relationship between phytoplankton structure and environmental variables in tropical reservoirs with different trophic states
Provedor de dados: 39
Autores: Oliveira,Simone Alves de; Ferragut,Carla; Bicudo,Carlos Eduardo de Mattos.
ABSTRACT Phytoplankton structure is influenced by environmental factors, seasonal cycles and the trophic state of the system. The objective of the present study was to identify guilds of phytoplankton species that are representative of seasonality and trophic status. We evaluated phytoplankton biomass and species composition in five tropical reservoirs, with different trophic states and during rainy and dry periods. At most of the sampling sites, total biomass was higher during the rainy season. Moreover, high cyanobacterial biomass was observed in all reservoirs except for one of the mesotrophic reservoirs, which had no significant contribution from the group. Phytoplankton guilds associated with the trophic gradient and seasonality were identified....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Phytoplankton; Guild; Reservoir; Seasonality.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100083

Chemical composition of sorghum genotypes silages
Provedor de dados: 2
Autores: Moura, Marielly Maria Almeida; Pires, Daniel Ananias de Assis; Rodrigues, José Avelino Santos; Sales, Eleuza Clarete Junqueira de; Costa, Renê Ferreira; Tolentino, Daniella Cangussú.
 The objective was to select sorghum genotypes for silage production using its chemical characteristics. The experiment was carried out in the facilities of Embrapa Maize and Sorghum in Sete Lagoas, state of Minas Gerais, to evaluate the agronomic characteristics, and nutritional quality of silage of twelve sorghum genotypes. We used a randomized block design with three replications. In relation to the production of green matter, the genotypes SF15 Volumax and BR610 stood out (52.07; 48.00 and 41.87 ton ha-1). Regarding pH, genotypes 1015339, 1015347, 1016007, SF15, BRS655, Volumax and BR610 averaged 3.68. All genotypes were similar considering the nutritional value, ammonia nitrogen and water activity. The genotypes SF15, Volumax and BRS610 showed the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ZOOTECNIA; NUTRIÇÃO E FORRAGICULTURA preserved food; Seasonality; Genotypes and production.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/31810

Initial height of pasture deferred and utilized in winter and tillering dynamics of signal grass during the following spring
Provedor de dados: 2
Autores: Santana, Sabrina Saraiva; Universidade Estadual Paulista “Júlio de Mesquita Filho”; Fonseca, Dilermando Miranda da; Universidade Federal de Viçosa; Santos, Manoel Eduardo Rozalino; Universidade Federal de Uberlândia; Sousa, Braulio Maia de Lana; Universidade Federal de Sergipe; Gomes, Virgílio Mesquita; Universidade Estadual de Montes Claros; Nascimento Júnior, Domicio do; Universidade Federal de Viçosa.
Tillering dynamics during regrowth in the spring (September to December 2009) on signal grass (Brachiaria decumbens cv. Basilisk) pastures deferred in the beginning of April 2009 is evaluated. Four pasture heights were evaluated at the beginning of deferment (10, 20, 30 and 40 cm). The experimental design consisted of completely randomized blocks with two replications. Rise in pasture height at the beginning of deferment decreased the appearance rate, increased the mortality rate and reduced the survival rate, the balance between appearance and mortality and the stability index of the tiller population at the beginning of the spring. Pastures deferred at initial height of 30 and 40 cm presented relatively stable tiller appearance rate between the beginning...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria decumbens; Pasture deferment; Plant ecophysiology; Seasonality.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/20463

Cyanobacteria community in two tropical eutrophic reservoirs in northeastern Brazil
Provedor de dados: 3
Autores: Oliveira, Fábio Henrique Portella Corrêa de; Silva, Joanne D'Arc Bezerra da; Costa, Anapaula Nunes Silvestre Fernandes; Ramalho, Waldemir Pimentel; Moreira, César Henrique Pinto; Calazans, Tiago Luiz Santana.
This study investigated the effect of seasonality on the Cyanobacteria community in two tropical eutrophic reservoirs in northeastern Brazil. Monthly samplings were conducted in the sub-surface of reservoirs. The following abiotic variables were analyzed: apparent color, turbidity, conductivity, alkalinity, calcium, magnesium, sodium, potassium, sulfate, total phosphorous, ammonia, nitrate, nitrite, chlorides, total hardness and chlorophyll-a, according to APHA (2012). Cyanobacteria density was quantified through biomass. Data were analyzed using one-way ANOVA and Redundancy Analysis (RDA). Higher mean values of Cyanobacteria biomass occurred in the dry (9.9mm3 L-1) and rainy (19.0mm3 L-1) season in Jucazinho and Carpina reservoirs, respectively,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic parameters; Phytoplankton; Seasonality.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/26418

Composição e sazonalidade dos moluscos do alto rio Paraná, Brasil, e sua potencialidade como hospedeiros intermediários de digenéticos - DOI: 10.4025/actascibiolsci.v30i3.5018
Provedor de dados: 3
Autores: Souza, Geza Thais Rangel e; UEM; Machado, Marion Haruko; UEM; Dias, Maria Luiza Gaspar Goulart; UEM; Yamada, Fábio Hideki; UEM; Pagotto, João Paulo Alves; UEM; Pavanelli, Gilberto Cezar; UEM.
Este trabalho analisa a composição e a sazonalidade das espécies de moluscos potenciais hospedeiros intermediários de trematódeos digenéticos, bem como fornece informações a respeito das possíveis infecções por diplostomídeos nesta comunidade, em ambientes lênticos da planície de inundação do alto rio Paraná. Foram coletadas e analisadas dez espécies de moluscos, e houve nítida sazonalidade na densidade e abundância dos moluscos, correlacionada significativamente com a temperatura da água. Os maiores valores observados foram entre os meses de novembro de 2002 a fevereiro de 2003. Apenas Biomphalaria peregrina caracterizou-se como hospedeiro para Diplostomidae, pois nesta espécie foram encontradas 32 cercárias de Hysteromorpha triloba em março de 2003.
Palavras-chave: 2.00.00.00-6    Ciências Biológicas moluscos; Diplostomidae; Composição; Sazonalidade; Rio Paraná. mollusks; Diplostomidae; Composition; Seasonality; Paraná river.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5018

Variação temporal da comunidade fitoplanctônica em lagos urbanos eutróficos - doi: 10.4025/actascibiolsci.v33i4.5955
Provedor de dados: 3
Autores: Nabout, João Carlos; UFG; Nogueira, Ina Souza; UFG.
O objetivo desse trabalho foi averiguar a mudança sazonal e o sincronismo temporal de atributos da comunidade fitoplanctônica (diversidade e a densidade) de quatro reservatórios urbanos eutróficos (lago do Jardim Botânico, lago do parque Vaca Brava, lago das Rosas e lago do bosque dos Buritis) do município de Goiânia, Estado de Goiás. A diversidade foi estimada pelo índice de Shannon-Winner (H’) e a densidade foi pelo método de Utermöhl. Todos os quatro lagos apresentaram elevada diversidade fitoplanctônica, variando de H’ = 0,97 (bosque dos Buritis) a H’ = 4,29 (lago do Jardim Botânico), além disso, a diversidade foi significativamente distinta entre os quatro lagos estudados (F = 4,74; p &lt; 0,001, n = 4). A densidade fitoplanctônica foi elevada, sendo...
Palavras-chave: Ecologia; Botanica; Taxonomia de criptógamos Densidade; Diversidade; Sincronismo; Lagos artificiais; Fatores locais; Sazonalidade Density; Diversity; Synchronism; Artificial lakes; Local factors; Seasonality.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5955

Abundance and length structure of Brycon nattereri (Osteichthyes, Bryconidae), an endangered fish species in central Brazil
Provedor de dados: 3
Autores: Vitorino Júnior, Oscar Barroso; Lopes, Kelven Stella; Pelicice, Fernando Mayer.
Brycon nattereri is a threatened fish species restricted to small headwater rivers of the Paraná, São Francisco and Tocantins rivers. This species has been extirpated from many sites, and little is known about its ecology. In this sense, the present study investigated temporal variations in the occurrence, abundance and length structure of B. nattereri in the Dois Irmãos river, a small headwater river from the Tocantins river basin. Samples were taken monthly between January and November of 2009 and 2010. The studied site comprised a 4.5 km river stretch, sampled with an active fishing method (fly fishing). Individuals caught were counted, measured and returned immediately to the river. We caught 302 individuals along two years. Brycon nattereri was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2.05.03.00-8 Ecologia Aplicada fish population; Seasonality; Conservation; Headwater; Tocantins river Ecologia.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/23857

Pampean lizard assemblage from subtropical Brazil: a temporal analysis
Provedor de dados: 42
Autores: Winck,Gisele R.; Santos,Tiago G. Dos; Cechin,Sonia Z.
The increasing human occupation of natural environments is one of the greatest threats to biodiversity. To mitigate the negative anthropogenic effects, it is necessary to understand the characteristics of natural populations and the natural history of species. A study was conducted with an assemblage of lizards from a disturbed area of the Pampa biome, from February 2001 to January 2004. The assemblage showed a unimodal seasonal pattern, with the recruitment period occurring during the warmer months. The captures were seasonal for two of the three monitored years, and concentrated within warmer months. The minimum temperature explained the number of catches for the assemblage as a whole. However, when the species were analyzed individually, the temperature...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grassland; Activities pattern; Seasonality; Reptiles; Unimodal pattern.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400021

Seasonal pelage color change: news based on a South American Rodent
Provedor de dados: 42
Autores: Camargo,Carolina R.; Colares,Elton; Castrucci,Ana Maria L.
Mammalian seasonalmolting and color change are known to be influencedby photoperiod changes. Calomys laucha, a South American rodent, exhibits seasonal pelage color change; however, unlike Northern hemisphere rodents, which present a gray or brown color during summer and a whitish color during winter, C. laucha pelage changes from an orange color during summer to a dark gray color during winter. Animals maintained for over a year in stationary photoperiod (LD 12:12h, 22ºC) presented orange pelage color during the summer corresponding month (January), and gray color during the winter corresponding month (July). Same age animals were evaluated during summer or winter months, and also showed different colors. Animals exposed for 12 weeks to summer or winter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Color change; Endogenous rhythm; Seasonality; Molt; Pelage color.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100009

Respiratory syncytial virus causes more hospitalizations and deaths in equatorial Brazil than influenza (including during the 2009 pandemic)
Provedor de dados: 42
Autores: ALONSO,WLADIMIR J.; TAMERIUS,JAMES; FREITAS,ANDRÉ R.R.
Abstract  Despite numerous studies evaluating influenza and Respiratory Syncytial Virus (RSV), there is still a lack of knowledge about them, especially in tropical countries. We compared the relative importance of respiratory viruses by examining their spatiotemporal patterns, age-specific hospitalization data and mortality data for 2007-2012 obtained from official sources. The data were aggregated into “respiratory infection seasonal zones” formed combining states that had similar seasonal patterns of pneumonia and influenza (P&amp;I). Equatorial-North where P&amp;I peaks in the middle of the year, Equatorial-South where P&amp;I peaks in the first semester and coincides with the rainy-season, Subtropical where P&amp;I peaks are clearly concentrated in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Disease burden; Influenza; RSV; Seasonality; Pandemic; 2009pdm.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100904

Species richness and composition of epiphytic bryophytes in flooded forests of Caxiuanã National Forest, Eastern Amazon, Brazil
Provedor de dados: 42
Autores: CERQUEIRA,GABRIELA R.; ILKIU-BORGES,ANNA LUIZA; FERREIRA,LEANDRO V.
ABSTRACT This study aimed to compare the richness and composition of the epiphytic bryoflora between várzea and igapó forests in Caxiuanã National Forest, Brazilian Amazon. Bryophytes were collected on 502 phorophytes of Virola surinamensis. Average richness per phorophyte and composition between forests and between dry and rainy periods was tested by two-way analysis and by cluster analysis, respectively. In total, 54 species of 13 families were identified. Richness was greater in igapó forest (44 species) compared to várzea forest (38 species). There was no significant difference in the number of species between the studied periods. Cluster analysis showed the bryoflora composition was different between várzea and igapó, but not between dry and rainy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Floristics; Liverworts; Mosses; Seasonality.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502371

Harvesting Season and Botanical Origin Interferes in Production and Nutritional Composition of Bee Pollen
Provedor de dados: 42
Autores: NEGRÃO,ADRIANA F.; ORSI,RICARDO O.
ABSTRACT We aimed to evaluate the frequency of bee pollen production, its botanical origin and chemical composition when collected in different seasons. Our results indicate that higher proteins (22.80 ± 3.09%) and flavonoids (2789.87 ± 1396.00 μg 100g-1) levels were obtained in the winter season, which also showed greater pollen production (134.50 ± 35.70 grams) and predominance of the Myrtaceae family. As for spring we found high concentrations of lipids (4.62 ± 2.26%) and low ash content (2.22 ± 0.39%). Regarding the amino acid composition and vitamin C content, we found no differences between the averages throughout the seasons. Our results highlight the importance of understanding not only the botanical origin and the chemical composition of bee...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis mellifera; Bee flora; Bee nutrition; Seasonality; Protein content.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100325

Hawkmoth fauna (Sphingidae, Lepidoptera) in a semi-deciduous rainforest remnant: composition, temporal fluctuations, and new records for northeastern Brazil
Provedor de dados: 42
Autores: PRIMO,LUIS M.; DUARTE,JOSÉ A.; MACHADO,ISABEL C.
We carried out a qualitative and quantitative inventory of the hawkmoth fauna (Sphingidae) of an area of semi-deciduous seasonal rainforest in the state of Pernambuco (Tapacurá Ecological Station), northeastern Brazil. Hawkmoths were sampled monthly from October 2004 to February 2007 (27 months). We recorded 31 species from 16 genera, three tribes, and three families. Macroglossinae was the most abundant subfamily and represented ca. 71% of all species. Out of the 277 individuals collected, 88.4% were males. Five new records were made for northeastern Brazil: Enyo gorgon (Cramer, 1777), Perigonia stulta (Herrich-Schäffer, [1854]), Eupyrrhoglossum sagra (Poey, 1832), Nyceryx coffaeae (Walker, 1856) and Xylophanes chiron (Drury, 1773). Eight further species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dry forest; Pernambuco Endemism Center; Phenology; Seasonality; Sphingidae abundance and richness; Sphingophily.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301177

Forage potential of native ecotypes of Paspalum notatum and P. guenoarum
Provedor de dados: 42
Autores: STEINER,MARCELO G.; DALL’AGNOL,MIGUEL; NABINGER,CARLOS; SCHEFFER-BASSO,SIMONE M.; WEILER,ROBERTO L.; SIMIONI,CARINE; SCHIFINO-WITTMANN,MARIA TERESA; MOTTA,ÉDER A.M. DA.
ABSTRACT The Paspalum genus includes several species that are important for livestock in Rio Grande do Sul, such as P. notatum and P. guenoarum, typical of native pastures of the Pampa biome. The aim of this study was to investigate forage production and chemical composition of four ecotypes of these species in relation to the cv. ‘Pensacola’ (P. notatum). Ecotypes of P. guenoarum (Azulão and Baio) and P. notatum (André da Rocha and Bagual) and the cv. ‘Pensacola’ were evaluated for two years, during which four cuts/year were made. The work was carried out under field conditions at the Agronomic Experimental Station of the Federal University of Rio Grande do Sul (30°05’S; 51°39’W), in a completely randomized design. P. guenoarum stood out for higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seasonality; Fiber; Forage production dry matter; Crude protein.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401753

Correlations of condition factor and gonadosomatic, hepatosomatic and lipo-somatic relations of Leptodactylus macrosternum (ANURA: Leptodactylidae) in the Brazilian Semi-arid
Provedor de dados: 42
Autores: CHAVES,MARCIO F.; TENÓRIO,FERNANDA C.M.A.; SANTOS,IGOR L.V.L.; J.C.L. NETO,CLOVIS; TEXEIRA,VALERIA W.; MOURA,GERALDO J.B.; TEXEIRA,ÁLVARO A.C.
ABSTRACT The objective of this study was to assess variations of the condition factor (K1) in relation to the gonadosomatic- RGS and energy reserves (hepatosomatic - RWL and liposomatic - RFB relations) of Leptodactylus macrosternum and their relationship to climate variation in the Northeast of Brazil, Caatinga area, state of Paraiba. The animals were captured fortnightly through active collecting, between January and December 2013. Significant differences were observed in the monthly variations of K1, RGS and RFB indices in male and female L. macrosternum over the months of collection. In males, K1 showed no significant relationship with the other variables. In females, RGS values only show notable correlations with RWF and K1 values. K1 values showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anurans; Fatty bodies; Northeast; Reproduction; Seasonality.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000401591

Climate conditions associated with the occurrence of pyrethroid residues in bulk milk tank
Provedor de dados: 45
Autores: Picinin,L.C.A.; Toaldo,I.M.; Hoff,R.B.; Souza,F.N.; Leite,M.O.; Fonseca,L.M.; Diniz,S.A.; Silva,M.X.; Haddad,J.P.A.; Cerqueira,M.M.O.P.; Luiz,M.T.B.
ABSTRACT The present study attempted to identify climate conditions that are associated with the occurrence of pyrethroid residues using a multivariate principal component analysis (PCA). A total of 132 raw milk samples were collected from dairy farms in Minas Gerais State - Brazil and analyzed for seven analytes using gas chromatography with electron capture detection. Of the 132 milk samples, pyrethroid residues were identified in 14 (10.6%) milk samples, of which 12 (9.1%) and two (1.5%) milk samples had the identification of cypermethrin and deltamethrin, respectively. From those samples, nine (6.8%) milk samples were regarded as non-compliant for cypermethrin with this analyte concentration above the maximum residue limits set by Brazilian...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Veterinary drug; Pesticide; Raw milk; Seasonality; Dairy cow.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352016000601721

Beef cattle performance on signal grass pastures deferred and fertilized with nitrogen
Provedor de dados: 45
Autores: Amorim,P.L.; Fonseca,D.M.; Santos,M.E.R.; Pimentel,R.M.; Rodrigues,J.P.P.; Chizzotti,F.H.M.; Vitor,C.G.
ABSTRACT The effect of four nitrogen levels (0, 40, 80 and 120kg N ha-1), applied before deferment on the beef cattle production and structural variables on Urochloa decumbens (signal grass) were assessed from January to October 2012 and from January to September 2013. A randomized block design with three replicates was adopted, in an arrangement of repeated measures in time (grazing period). An interaction effect between nitrogen level and grazing period was observed on extended-plant height and herbage mass. As the nitrogen levels were increased, extended-plant height, herbage mass, total herbage allowance, and efficiency of conversion of fertilizer into herbage were increased. Throughout the grazing period, pasture height, extended-plant height,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Average daily gain; Deferrment; Seasonality; Tropical pasture; Urochloa decumbens.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000401395

Climate conditions associated with the occurrence of antimicrobial and macrocyclic lactone residues in bulk tank milk
Provedor de dados: 45
Autores: Picinin,L.C.A.; Toaldo,I.M.; Hoff,R.B.; Souza,F.N.; Leite,M.O.; Fonseca,L.M.; Diniz,S.A.; Silva,M.X.; Haddad,J.P.A.; Cerqueira,M.M.O.P.; Bordignon-Luiz,M.T.
ABSTRACT The present study aimed to identify the climate condition parameters that are associated with the occurrence of antimicrobial and macrocyclic lactone residues in bulk tank milk using a multivariate principal components analysis (PCA). A total of 132 raw milk samples were collected at dairy farms in Minas Gerais State in Brazil and analyzed for 35 analytes, comprising macrocyclic lactones and antibacterials, using liquid chromatography coupled with mass spectrometry in tandem mode spectrometry. Of the 132 samples, 34 (25.76%) bulk tank milk samples were positive for at least one analyte. PCA showed that antimicrobial residues in bulk tank milk occurred less frequently on days with a higher average temperature, maximum temperature and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthelmintic; Antibiotic; Veterinary drug; Seasonality; Raw milk.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352017000200474

On the use of open or closed traps in the capture of drosophilids
Provedor de dados: 49
Autores: Penariol,Leiza; Bicudo,Hermione Elly Melara de Campos; Madi-Ravazzi,Lilian.
The use of open or closed traps in order to standardize the drosophilid collection is still a matter of discussion among researchers. In this paper, comparative data of drosophilid collections, using open and closed traps are presented. The collections were made monthly, during one year, in one fragment of a semidecidual forest located in the São Paulo State, Brazil. The efficiency of the traps was evaluated by the use of community descriptors: population abundance and richness and diversity of species. Closed traps were more efficient than the open ones in relation to the population abundance and the species richness, indicating their adequacy for standardization of drosophilid collection in studies of biodiversity and seasonality.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capture traps; Drosophilid; Biodiversity; Seasonality.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000200004

Spatial and temporal distribution in two anuran communities in the Chapada do Araripe, Northeastern Brasil
Provedor de dados: 49
Autores: Ferreira-Silva,Cristiana; Oliveira,Deivid Batista de; Oliveira,Herivelto Faustino de; Ávila,Robson Waldemar.
In this study, we report the temporal occurrence and habitat and microhabitat use by anurans in two areas located in one highland marsh (brejo-de-altitude) in northeastern Brazil. Fieldwork was carried out between September 2011 and September 2012. The recorded anurans belong to 14 species distributed in five families: Hylidae (six), Leptodactylidae (five), Bufonidae, Odontophrynidae and Pipidae (one each). Vocalization activity was seasonal and concentrated in the wetter and warmer months, but correlated to rainfall only in the top in the Chapada do Araripe. Richness and abundance of calling anurans were lower in the humid forest of the slope than in Cerradão area in the top of the Chapada do Araripe. Scinax x-signatus vocalized during nine months, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anurofauna; Microhabitat use; Seasonality.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000100106

Temporal and spatial variations in tidepool fish assemblages of the northeast coast of Brazil
Provedor de dados: 49
Autores: Cunha,Francisca Edna de Andrade; Monteiro-Neto,Cassiano; Nottingham,Mara Carvalho.
Temporal and spatial variations and environmental factors influencing the structure of tidepool fish assemblages were quantitatively investigated at Iparana beach, northeast Brazilian coast. The majority of the tidepool fishes sampled were suprabenthic juvenile individuals of great mobility. We recorded during monthly diurnal underwater visual censuses a total of 4,750 fish from 26 species, represented mainly by partial residents from the families Scaridae, Haemulidae, Gerreidae and Pomacentridae. The number of species and individuals showed significant variability among tidepools as a response to variations in their volume and type of substrate cover. The greatest species abundance and richness associated with rocks covered with algae suggested that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tidepool fishes; Environmental factors; Seasonality; Diversity; Abundance.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032007000100016

Insect cornucopia: various bird types prey on the season's first giant cicadas in an urban park in southeastern Brazil
Provedor de dados: 49
Autores: Sazima,Ivan.
Some species of large cicadas (Hemiptera) emerge in huge numbers during particular periods, and thus become an abundant food source for several vertebrate species that dwell in the same areas. I record here a small assemblage of six bird species that preyed on the season's first giant cicadas (Quesada gigas) from early September to mid November 2007 in an urban park of Campinas, São Paulo, southeastern Brazil. The Plumbeous Kite (Ictinia plumbea) was the most ubiquitous cicada predator. It waited high on perches or patrolled on wing and hunted adult cicadas only. Three cuckoo species (Crotophaga ani, Guira guira, and Piaya cayana) foraged on cicadas both on vegetation and on the ground, the first one also taking nymphs that emerged from a pond bank. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aves; Ictinia plumbea; Cicada prey; Quesada gigas; Mass emergence; Seasonality; Abundant food source; Urban area.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032009000100027

Ecology and diversity of a lizard community in the semiarid region of Brazil
Provedor de dados: 49
Autores: Andrade,Maria Jaqueline Monte de; Sales,Raul Fernandes Dantas; Freire,Eliza Maria Xavier.
Composition, species diversity and resource usage in terms of space and time were evaluated for the lizard community of the Ecological Station of the Seridó (ESEC Seridó), Rio Grande do Norte. An observation area of 150 m × 150 m (2.25 ha) was delimited and surveyed monthly in alternate turns (morning, afternoon and night) for three consecutive days from April to October 2011, covering dry and rainy seasons. Fourteen species belonging to eight families were recorded, being Tropidurus semitaeniatus the most abundant. Seasonality influenced species richness and abundance. Regarding habitat usage, Lygodactylus klugei was the most generalist species, whilePhyllopezus periosus, P. pollicaris and T. semitaeniatus were specialists, showing affinity for rocky...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caatinga; Activity periods; Habitat use; Microhabitat use; Richness; Seasonality.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000300199

Interactions between frugivorous birds and plants in savanna and forest formations of the Cerrado
Provedor de dados: 49
Autores: Purificação,Keila Nunes; Pascotto,Márcia Cristina; Pedroni,Fernando; Pereira,Jessiane Mayara Nogueira; Lima,Naftali Alves.
We recorded interactions between frugivorous birds and plants in the Cerrado and we assessed the role and importance of birds as potential seed dispersers. We analyzed the distribution of recorded feeding events, bird-plant interactions, and bird species composition between savanna and forest formations and between the dry and rainy seasons. Samplings were carried out from August 2009 to October 2010 and from November 2011 to August 2012 by means of line transects and focal observations. We recorded 348 feeding events and 187 interactions involving 44 plant species and 60 bird species. Most of the feeding events were observed in the forests and during the dry season (χ2 = 39.529; gl = 1; p &lt; 0.001). However, no significant difference was found in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mutualistic interactions; Neotropical savanna; Seasonality; Seed dispersal.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032014000400105

Temporal and spatial variation of Myriapoda (Diplopoda and Chilopoda) assemblages in a Neotropical floodplain
Provedor de dados: 49
Autores: Santos-Silva,Lorhaine; Pinheiro,Tamaris Gimenez; Chagas-Jr,Amazonas; Marques,Marinêz Isaac; Battirola,Leandro Dênis.
Abstract: Myriapods constitute important edaphic macrofauna taxa which dwell in different trophic levels and influence the dynamics of these environments. This study evaluated the variation in composition, richness and abundance of edaphic myriapod assemblages as a function of the distribution and structure of flooded and non-flooded habitats (spatial variation) and hydrological seasonality (temporal variation) in a floodplain of the northern Pantanal region of Mato Grosso, Brazil. Sampling was carried out in three areas of the Poconé Pantanal, along an altitudinal and inundation gradient consisting of inundated and non-inundated habitats and different vegetation formations. Three quadrats (10 x 10 m) were delimited within each habitat type, where sampling...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Conservation; Myriapods; Seasonality; Wetlands.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000200208

Influence of abiotic variables on the bat fauna of a granitic cave and its surroundings in the state of São Paulo, Brazil
Provedor de dados: 49
Autores: Rocha,Alana Drielle; Bichuette,Maria Elina.
Abstract In the present study we analyzed the bat assemblage of the granitic cave Gruta do Riacho Subterrâneo and its surroundings (Itu, São Paulo state, Brazil) aiming to verify the influence of seasonality on its species composition and population abundances. Five samplings were carried out with three days of duration each, along the period from October 2013 to September 2014. Captures of bats were performed by setting mist nets in cave entrances, its interior and surroundings, making a total capture effort of 6,090 m2.h. Our results indicate that this cave is shelter for a rich bat assemblage with fifteen species captured. Carollia perspicillata, Desmodus rotundus and Myotis sp. were the most abundant species. A comparison of the assemblage composition...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bats; Granitic cave; Seasonality; Biodiversity.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000300207

Seasonal pattern of Chrysomelidae (Coleoptera) in the state of Paraná, southern Brazil
Provedor de dados: 49
Autores: Linzmeier,Adelita Maria; Ribeiro-Costa,Cibele Stramare.
The aim of this paper was to describe the seasonal patterns of Chrysomelidae and of its most abundant species at eight sites in different geomorphological and floristic regions in the state of Paraná, southern Brazil. Samples with Malaise traps, from August 1986 to July 1988 were performed. The Chrysomelidae showed seasonal patterns with the highest abundance in the spring and/or summer at all sites, but with variations in the months of highest captures. Photoperiod was the variable that most influenced the seasonality of Chrysomelidae, and along with temperature and relative humidity, determined most of the seasonal patterns of the family at the different sites. Some dominant species of Chrysomelidae showed different seasonal pattern compared to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Alticini; Herbivorous insects; Distribution pattern; Seasonality.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000100018

Fine root biomass and root length density in a lowland and a montane tropical rain forest, SP, Brazil
Provedor de dados: 49
Autores: Rosado,Bruno Henrique Pimentel; Martins,Amanda Cristina; Colomeu,Talita Cristina; Oliveira,Rafael Silva; Joly,Carlos Alfredo; Aidar,Marcos Pereira Marinho.
Fine roots, &lt;2 mm in diameter, are responsible for water and nutrient uptake and therefore have a central role in carbon, nutrient and water cycling at the plant and ecosystem level. The root length density (RLD), fine root biomass (FRB) and vertical fine root distribution (VRD) in the soil profile have been used as good descriptors of resource-use efficiency and carbon storage in the soil. Along altitudinal gradients, decreases in temperature and radiation inputs (depending on the frequency of fog events) may reduce decomposition rates and nutrient availability what might stimulate plants to invest in fine roots, increasing acquisition of resources. We evaluated the seasonal variation of fine root parameters in a Lowland and Montane forest at the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Altitudinal variation; Fine root parameters; Vertical distribution of fine roots; Seasonality; Atlantic rain forest.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032011000300018

Interaction genotype by season and its influence on the identification of beans with high content of zinc and iron
Provedor de dados: 53
Autores: Silva,Camila Andrade; Abreu,Ângela de Fátima Barbosa; Ramalho,Magno Antonio Patto; Corrêa,Angelita Duarte.
The mineral contents in common bean seeds are influenced, in addition to genetic variation, by environmental crop conditions, especially by the soil type and chemical composition and by the genotype x environment interaction. This study was carried out to verify if the zinc and iron contents are affected by the crop growing period. Ten lines with high iron and zinc contents and ten with low contents were assessed in three seasons: "wet season" of 2009/2010 (sowing in November); "dry season" of 2010 (sowing in February) and "winter season" of 2010 (sowing in July), in Lavras, Minas Gerais State, Brazil. The experimental design used was randomized blocks with three replications and plots consisting of two rows of two meters, with a spacing of 0.50 m. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris L.; Nutritional quality; Seasonality.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052012000300003

Reproductive behavior of the mangrove crab Ucides cordatus (Crustacea; Brachyura; Ucididae)
Provedor de dados: 52
Autores: Linhares,Jussiara Candeira Spíndola; Silva,José Roberto Feitosa.
The aim of the present work was to study the reproductive behavior of the mangrove crab (Ucides cordatus) in the estuary of the Igaraçú River (Piauí, Brazil). Courtship and mating were observed in December 2007 and in January-March 2009. The most frequently observed reproductive behavior was the transference of eggs onto the abdomen of the female. Some disputes between males and some copulations were observed. The males mated with more than one female each night and all mating activity occurred at night. The establishment of a closed season coinciding with the mating season represented an effective strategy for the preservation of the species when the socioeconomic situation of the community of gatherers was taken into account.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Courtship; Mating; Maturation; Estuary; "Andada"; Seasonality.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000600014

Effects of plant cover on the macrofauna of Spartina marshes in northern Brazil
Provedor de dados: 52
Autores: Braga,Cesar França; Beasley,Colin Robert; Isaac,Victoria Judith.
Data on macrofauna density and diversity, and the height and density of Spartina brasiliensis, were obtained from salt marsh beds of a tropical estuary in northern Brazil. Sampling was carried out at four distinct times of the year, during the wet and dry seasons and in the transition periods between these. Sampling was also carried out in salt marshes of three size classes, small, medium and large. Variables were analyzed in relation to time of year and salt marsh size class. Overall, 46 taxa were found, with polychaetes, isopods and the gastropod Neritina virginea dominating the fauna. Macrofauna density and diversity were positively correlated with culm density, indicating a possible role in protection from predation. All the three variables were higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Macrofauna; Spartina; Density; Diversity; Seasonality; Tropical estuary.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000600013

Limnological characteristics and seasonal changes in density and diversity of the phytoplanktonic community at the Caçó pond, Maranhão State, Brazil
Provedor de dados: 52
Autores: Dellamano-Oliveira,Maria José; Senna,Pedro Américo Cabral; Taniguchi,Glória Massae.
Seasonal changes of the phytoplanktonic community and limnological abiotic characteristics of Caçó pond (Maranhão State, Brazil) was evaluated from two field researches during the rainy (April 1999) and dry (November 1999) seasons. Measurements of twelve chemical and physical variables and phytoplankton collections were carried out at eight sampling stations. The Chlorophyceae and Cyanobacteria groups were in highest fractions during the rainy and dry seasons, respectively. The limnological abiotic variables showed a homogenous spatial distribution. The cluster analysis, using Bray-Curtis distance, distinguished two major groups, represented by the most common and abundant species in both the periods. The results showed that the climate regime, due to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seasonality; Phytoplankton; Diversity; Tropical region.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400019

Haematological Parameters of the Hybrid Surubim (Pseudoplatystoma reticulatum x P. corruscans) farmed in Brazil
Provedor de dados: 52
Autores: Jerônimo,Gabriela Tomas; Brum,Aline; Pádua,Santiago Benites de; Gonçalves,Eduardo Luiz Tavares; Capecci,Robson Soares; Ishikawa,Márcia Mayumi; Martins,Maurício Laterça.
This study evaluated the haematological parameters of the hybrid surubim (Pseudoplatystoma corruscans x P. reticulatum) farmed in intensive and semi intensive system. A total of 240 fish were examined, 120 from fish farm and 120 from a semi-intensive for comparison between the hot and cold season. The water quality was weekly measured to evaluate the influence of environmental conditions on the haematology. Fish from intensive system showed hematocrit and white blood cell count (WBC) higher in hot season while the total plasmatic protein, hemoglobin concentration, mean corpuscular hemoglobin concentration (MCHC) and mean corpuscular volume (MCV) were higher in cold season. In fish from semi intensive system, the red blood cells count (RBC) and total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Culture system; Hematology; Seasonality; Siluriformes.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000200254

Spatial and temporal variation in the canopy cover in a tropical semi-deciduous forest
Provedor de dados: 52
Autores: Bianchini,Edmilson; Pimenta,José A.; Santos,Flavio A. M. dos.
This study was developed in the Mata dos Godoy State Park (23° 27’S, 51° 15’W) South Brazil which present great environmental heterogeneity when its north portion (ridge) is compared with the southern portion (valley), where there are some flooded areas. The forest formation is classified as tropical semi-deciduous forest. Spatial and temporal variations in the degree of the canopy cover were compared at flooded and unflooded sites. The measures were taken seasonally in 100m² plots using a spherical densiometer from spring 1995 to winter 1996. The flooded area was more open and lighter and had a greater spatial and temporal variation in the canopy cover than the unflooded areas. The greater heterogeneity in the flooded area could be due to structural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canopy; Flooding; Seasonality; Spatial heterogeneity; Tropical forest.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000300008

Composition and seasonal variation of the ichthyofauna from upper Rio Paraguaçu (Chapada Diamantina, Bahia, Brazil)
Provedor de dados: 52
Autores: Santos,Alexandre Clistenes de Alcântara; Caramaschi,Érica Pellegrini.
The aim of this work was to characterize the composition of the ichthyofauna of the upper course of the Rio Paraguaçu. Two excursions were carried out, one in the dry season, and the other in the rainy season, with 36 localities sampled. A total of 63 species were collected. Multivariate analyses indicated that abiotic variables such as the channel order and altitude were the main influences on the number of species present. The number of species in each excursion was equivalent in the two seasons, suggesting that seasonal changes have little influence on the ichthyofauna of this area.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rio Paraguaçu; Chapada Diamantina; Fish community; Abiotic parameters; Seasonality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000400012

Description and prevalence of Thynnascaris sp. larvae Dollfus, 1933 (Nematoda: Anisakidae) in Plagioscion squamosissimus Heckel, 1840 from Volta Grande Reservoir, State of Minas Gerais, Brazil
Provedor de dados: 57
Autores: MARTINS,M. L.; FUJIMOTO,R. Y.; MORAES,F. R.; ANDRADE,P. M.; NASCIMENTO,A. A.; MALHEIROS,E. B.
The present work studied helminth parasites of freshwater "corvina" Plagioscion squamosissimus from Volta Grande Reservoir, MG, Brazil. Sixty eight fishes with averages of 25.2 cm length and 180.9 g weight were collected with net, bimonthly from December 1995 thru December 1996. Parasites were carefully removed from their cysts that were present in the intestinal mesentery. Specimens were fixed in AFA 65°C and preserved in alcohol 70% with 5% of glicerine. In camera lucida 21 nematodes were drawned after clarification with acetic acid or Amann lactophenol. Nematode larvae were identified as Thynnascaris sp. (Nematoda: Anisakidae). From examined fishes 30 out of 68 presented nematode larvae with a prevalence of 44.1%. The average number of parasites per...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nematoda; Thynnascaris larvae; Plagioscion squamosissimus; Seasonality; Prevalence.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300017

Factors affecting biochemical composition of seston in an eutrophic reservoir (Pampulha Reservoir, Belo Horizonte, MG
Provedor de dados: 57
Autores: BOËCHAT,I. G.; GIANI,A.
Sestonic biochemical composition (lipids, proteins and carbohydrates) may change with varying environmental fluctuations. These changes and the effects in the nutritional status of algae consists of an actual increasing source of interest. The aims of this work were to establish the relationship between biochemical composition of seston and 1) a range of physical, chemical and climatological factors, and 2) the natural fluctuation in the species composition in phytoplankton assemblages of the Pampulha Reservoir, an urban eutrophic lake located in Belo Horizonte, MG. Seasonal changes in the biochemical composition were observed in this study. None of the considered abiotic factors alone seem to affect the biochemical composition. So the effects could only...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biochemical composition; Seston; Seasonality.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100009

Relationship between climatic factors and air quality with tuberculosis in the Federal District, Brazil, 2003-2012
Provedor de dados: 55
Autores: Fernandes,Fernanda Monteiro de Castro; Martins,Eder de Souza; Pedrosa,Daniella Melo Arnaud Sampaio; Evangelista,Maria do Socorro Nantua.
Abstract  Introduction: Despite the high rate of tuberculosis indicators in Brazil, the Federal District shows a low prevalence of the disease.  Objective: To analyze the relationship between climatic factors and air quality with tuberculosis in the Brazilian Federal District.  Methodology: This was an ecological and descriptive study comparing 3927 new cases of Tuberculosis registered at the Federal District Tuberculosis Control Program with data from the National Institute of Meteorology, Brazilian Institute of Geography and Statistics, Brazilian Agricultural Research Institute, Brasilia Environmental Institute, and the Federal District Planning Company.  Results: From 2003 to 2012, there has been a higher incidence of Tuberculosis (27.0%) in male...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tuberculosis; Seasonality; Air pollution.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702017000400369

Epidemiological aspects of rotavirus infections in Minas Gerais, Brazil
Provedor de dados: 55
Autores: Silva,Maria Luzia da Rosa e; Naveca,Felipe Gomes; Carvalho,Iná Pires de.
In order to develop good polices regarding public health measures and vaccine use to prevent rotavirus induced gastroenteritis, the epidemiology of the illness in various regions of Brazil is necessary. Accordingly, this study was to detect the frequency and types of rotavirus in one city in a tropical part of Brazil. This is an epidemiological survey of pediatric gastroenteritis caused by rotavirus conducted in Juiz de Fora, Minas Gerais State, Brazil. We analyzed 656 in-patient (190) and out-patient (466) stool samples from children ages 0 to 5 years during 1998. Rotavirus detection was performed using polyacrylamide gel electrophoresis (PAGE). Rotavirus was isolated from 62/190 stool samples (32.6%) from hospitalized children and 16/466 (3.4%) from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rotavirus; Gastroenteritis; Epidemiological survey; Seasonality; Electrophoretic patterns.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702001000400007

Prevalence of diarrheogenic Escherichia coli and rotavirus among children from Botucatu, São Paulo State, Brazil
Provedor de dados: 56
Autores: Rodrigues,J.; Acosta,V.C.; Candeias,J.M.G.; Souza,L.O.; Filho,F.J.C.
In a one-year prospective study carried out to define the role of rotavirus and Escherichia coli in local childhood diarrhea, we determined the prevalence of both agents in 54 diarrheic children attending a health center in Botucatu. Diarrheogenic E. coli (DEC) strains were characterized by O:H serotyping, a search for virulence genetic markers, and assays of adherence to HEp-2 cells. Except for enteroaggregative E. coli (EAEC), no other DEC category was detected in the children's stools. Both EAEC and rotavirus were isolated from 22 of the 54 (41.0%) diarrheic children as single agents or in combination with other enteropathogens. However, when considering the presence of a single agent, EAEC was dominant and isolated from 20.4% of the patients, whereas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diarrhea; Rotavirus; Enteroaggregative E. coli; Escherichia coli; Seasonality.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002001100008

Daily birth numbers in Passo Fundo, South Brazil, 1997-1999: trends and periodicities
Provedor de dados: 56
Autores: Mikulecky,M.; Lisboa,H.R.K.
Between October 6, 1997 and April 30, 1999, 5011 births (mean: 8.76 per day) were registered in the city of Passo Fundo, South Brazil. The sequence of 572 daily birth numbers was not random (iteration test). Neyman distribution (m = ¥) showed the best fit. Clusters of days with higher birth numbers alternated with days with low numbers of births. Periodogram analysis revealed a significant periodicity of 6.98 days. The cosinor regression, testing 10 a priori supposed period lengths, found significant seasonality peaking in August-September and significantly highest birth numbers on Thursdays. Among the lunar and solar rotation cycles, the tropic lunar cycle and its 4th harmonic were most pronounced, in agreement with results concerning natality in Germany...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Births; South Brazil; Periodogram; Cosinor; Seasonality; Weekly rhythm; Multiseptans; Cosmogeophysical-biomedical parallelism; Solar and lunar cycles.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000800017

Characterization saprobic fungi on leaf litter of two species of trees in the Atlantic Forest, Brazil
Provedor de dados: 58
Autores: Costa,Loise Araujo; Gusmão,Luís Fernando Pascholati.
Abstract We investigated the composition and structure of fungal communities associated with leaf litter generated by Clusia nemorosa and Vismia guianensis that belong to phylogenetically-related botanical families and exist together in a remnant of the Atlantic Forest in Bahia, Brazil. Samplings were conducted during wet (June 2011) and dry (January 2013) seasons in Serra da Jibóia. The fungi were isolated using particle filtration and the 1,832 isolates represented 92 taxa. The wet season yielded the largest number of isolates (1,141) and taxa (76) compared with the dry season (641 isolates and 37 taxa). The richness and diversity of fungal species associated with C. nemorosa (64 taxa, Simpson=0.95)were higher compared with those of V.guianensis (59...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fungal communities; Seasonality; Rainforest; Diversity; Fungal ecology.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000401027

Human respiratory syncytial virus detection in children admitted at a community hospital in Botucatu, SP, Brazil
Provedor de dados: 58
Autores: Bosso,Patrícia Alves Ramos; Candeias,João Manuel Grisi; Paduan,Karina dos Santos; Ricchetti,Sandra Mara Queiroz; Miranda,Antero Frederico Macedo de; Rugolo,Lígia Maria Suppo de Souza; Durigon,Edison Luiz; Ventura,Armando Morais.
Human Respiratory Syncytial Virus (HRSV) is recognized as the single most important pathogen responsible for acute viral infection of the lower respiratory tract in young children. In this study, 84 samples from children under two years of age presenting acute respiratory symptoms were obtained from September 2000 to November 2001. Analysis by immunofluorescence and reverse-transcription followed by PCR, revealed that 18% (15/84) of all the samples were positive for HRSV, in which 80% (12/15) of the cases was observed in children under six months of age and the subgroups A and B co-circulated in the studied period. These are the first data obtained for Botucatu city and seasonality is evident by the higher circulation of the virus between May and July.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Human Respiratory Syncytial Virus (HRSV); RT-PCR; Immunofluorescence; Seasonality.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822004000300015

Some aspects of citrus ecophysiology in subtropical climates: re-visiting photosynthesis under natural conditions
Provedor de dados: 61
Autores: Ribeiro,Rafael V.; Machado,Eduardo C.
In this review we re-visit and discuss the current knowledge on ecophysiology of citrus trees, addressing the influence of environmental conditions on citrus photosynthesis. Knowledge of physiological responses of citrus trees to their surrounding environment is essential in order to improve crop production and plant development, both being consequences of appropriate horticultural management in citrus orchards. In this context, citrus photosynthesis is addressed as the primary source of carbon and energy for plant growth and development. The photosynthetic activity on both a daily and a seasonal scale is reviewed, taking into consideration the physiological aspects related to seasonal variation of photochemical and biochemical activities, stomatal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbohydrate; Citrus; Chlorophyll fluorescence; Gas exchange; Seasonality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400009

Milk composition of Holstein cows: a retrospective study
Provedor de dados: 65
Autores: Bondan,Carlos; Folchini,Jéssica Aneris; Noro,Mirela; Quadros,Daniel Lazzari; Machado,Karine Martini; González,Félix Hilário Diaz.
ABSTRACT:  Worldwide, milk analysis is an satisfactory measurement of milk quality on dairy farms. Milk composition is the base for payment systems, so knowledge of its characteristics at different periods is essential for modern dairy producer. The aim of the study was to evaluate the effects of year, season, stage of lactation, and lactation number on variations in milk yield and composition of Holstein cows (n=148,604). Milk yield estimated by multiple regression was 25,50L/cow/day. Winter was the season with the highest milk yield and the highest protein and lactose content. Milk fat was highest in the fall, in cows in late lactation and also in primiparous cows. Lactating cows from 6 to 60 days in lactation and those in 2nd or 3rd lactation showed the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Milk quality; Lactation number; Seasonality; Stage of lactation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001200650