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| Registros recuperados: 47 | |
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| WOOLRICH-PIÑA,GUILLERMO A; GEOFFREY R,SMITH; LEMOS-ESPINAL,JULIO A; MONTOYA-AYALA,RAYMUNDO; ÁVILABOCANEGRA,LUIS E; BENAVIDES GARDUÑO,EDUARDO. |
| The distribution and abundance of organisms within a pond or lake can reflect the result of a variety of factors. We examined the abundance of the endemic fish, Poblana alchichica, in Lago de Alchichica, Puebla, Mexico, as well as how the abundance varied among months. Dissolved oxygen, temperature, and salinity varied among months. The abundance of Poblana alchichica peaked in December and February. For the months when fish were observed, their abundances were positively related to dissolved oxygen concentration and were generally not related to temperature. Our results provide evidence that there is substantial seasonal variation in the abundances of Poblana alchichica and that within months, their distributions are likely driven by dissolved oxygen than... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abundance; Dissolved oxygen; Poblana alchichica; Salinity; Seasonal variation; Temperature. |
| Ano: 2012 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2012000100015 |
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| Krupek, Rogério Antônio; UNESP/Assis; Branco, Ciro Cesar Zanini; UNESP/Assis; Peres, Cleto Kaveski; UNESP/Assis. |
| Três rios de pequeno porte pertencentes à bacia do rio das Pedras, localizada na região centro-sul do Estado do Paraná, foram estudados com o objetivo de se analisar o padrão de variação sazonal de alguns parâmetros físicos e químicos da água. Os trabalhos de campo foram realizados no período de abril de 2004 a março de 2005 por meio de amostragens mensais. Os seguintes parâmetros limnológicos foram avaliados: temperatura da água, condutividade específica, oxigênio dissolvido, pH, turbidez, velocidade da correnteza e profundidade. As águas da bacia do rio das Pedras mostraram características muito peculiares, apresentando um padrão sazonal típico para algumas das variáveis limnológicas estudadas. A Análise de Variância (Anova) mostrou diferenças... |
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Palavras-chave: Bacia de drenagem; Riacho; Variação sazonal; Variáveis físicas e químicas drainage basin; Stream; Seasonal variation; Physical and chemical variables.. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5873 |
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| Almeida, Fabiane Ferreira de; Instituto Nacional de Pesquisas da Amazônia - Programa de Pós-Graduação em Biologia de Água Doce e Pesca Interior; Melo, Sérgio; Instituto Nacional de Pesquisas da Amazônia. |
| Este estudo aborda a variação temporal (sazonal, semanal e nictemeral) e espacial de algumas variáveis limnológicas na região limnética do lago Catalão, um lago da planície de inundação do rio Amazonas. Foram analisados os valores de temperatura, zona eufótica, zona de mistura, condutividade elétrica, oxigênio dissolvido, transparência, nitrogênio e fósforo total, amostrados em quatro estações, em escala semanal, durante um mês no período de seca de 2006 e um mês no período de cheia de 2007. Regressões simples foram realizadas para testar a hipótese da homogeneização de ambientes aquáticos em função da inundação. Foram analisados, também, os valores de temperatura, oxigênio dissolvido e condutividade elétrica em um perfil vertical ao longo de um ciclo... |
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Palavras-chave: 2.05.02.00-1 variáveis limnológicas; Variação nictemeral; Planície de inundação; Variação sazonal; Pulso de inundação; Amazônia Brasileira Ecologia de Ecossistemas (Limnologia) limnological variables; Diel variation; Flood plain lake; Seasonal variation; Flood pulse; Brazilian Amazon. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/4641 |
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| MATOS,JISLENE B.; OLIVEIRA,SUELLEN M.O. DE; PEREIRA,LUCI C.C.; COSTA,RAUQUÍRIO M. DA. |
| ABSTRACT The present study aimed to analyze the structure and the temporal variation of the phytoplankton of Ajuruteua beach (Bragança, Pará) and to investigate the influence of environmental variables on the dynamics of this community to provide a basis about the trophic state of this environment. Biological, hydrological and hydrodynamic samplings were performed during a nyctemeral cycle in the months of November/08, March/09, June/09 and September/09. We identified 110 taxa, which were distributed among the diatoms (87.3%), dinoflagellates (11.8%) and cyanobacteria (0.9%), with the predominance of neritic species, followed by the tychoplankton species. Chlorophyll-a concentrations were the highest during the rainy period (24.5 mg m-3), whereas total... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon beaches; Biomass; Microalgae; Seasonal variation. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401325 |
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| Garcia,Marinês; Odebrecht,Clarisse. |
| The diatom Palmerina hardmaniana (Greville) Hasle presents a wide geographical distribution in neritic tropical and subtropical regions. In the present work we analyzed plankton samples collected monthly between 1995 and 2007 at the surf zone of Cassino Beach, RS (32° 12' S and 52° 10' W), and in winter 2005 and summer 2007 at the continental shelf and slope in southern Brazil, Santa Marta Grande Cape, SC and Albardão-Chuí, RS regions (28° 23'-33° 07' S and 48° 41'-52° 26' W). We present the detailed morphological description of P. hardmaniana, and the first study including electron scanning microscope observations for material from the southwestern Atlantic Ocean. The morphometric data confirm the identity of the species in all its ultra-structural... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytoplankton; Seasonal variation; Biogeography; Ultra-structure. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000200009 |
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| Vendel,Ana Lúcia; Lopes,Sabine Granado; Santos,César; Spach,Henry Louis. |
| Studies were carried out on fish assemblages in a tidal flat. Samples were obtained monthly at low tide of the half moon in the tidal flat of Paranaguá Bay, Brazil, with two seine nets, one with a 1 mm mesh, 30 m in length and 3 m in height and another with a 10 mm mesh, 65 m in length and 2 m in height. A total of 8,890 fish were captured, comprising 24 families and 53 species. The most abundant species were Harengula clupeola and Atherinella brasiliensis, which represented 63.4% of the total, capture. A seasonal tendency was observed in the abundance of fishes, with less fishes being captured during winter and part of spring. The number of species showed a seasonal pattern, with the gradual decrease through winter and a marked increase in summer. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tidal flat; Fish assemblages; Seasonal variation; Brazil. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000200015 |
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| Vendel,Ana Lúcia; Spach,Henry Louis; Lopes,Sabine Granado; Santos,César. |
| Studies were carried out on structure and dynamics of fish assemblages in the Baguaçu tidal creek, Paranaguá Bay, Brazil. A total of 30,104 fish were captured, comprising 21 families and 47 species. Both in weight and in number, the species Anchoa parva prevailed. Monthly captures in number and weight were largest in the autumn and part of the winter. No seasonal tendency was observed in the indexes of community structure. The dendrogram produced by the classification of the samples separated the 12 months of collection into three groups, reflecting differences in the qualitative and quantitative occurrences of the most important taxa. Some ecological likeness, not only seasonal patterns of abundance, seemed evident in the seasonality of the groupings of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tidal creek; Fish assemblages; Seasonal variation; Brazil. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000300015 |
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| SILVA,J. A. M. da; PEREIRA-FILHO,M.; OLIVEIRA-PEREIRA,M. I. de. |
| The aim of this study was to evaluate the importance of fruits and seeds as food items in the natural diet of the tambaqui (Colossoma macropomum). During one year, tambaqui's stomach contents were collected, and their nutritional and energetic values were determined. During the flooding period, and while the river water was rising, which coincided with a high availability of fruits and seeds, the protein content of food was low (11%-15% of dry matter basis), whereas in the dry season, when tambaqui fed mainly zooplankton, there was a high protein content (45%-57% of dry matter basis). Lipid, carbohydrate, crude fiber, ash and gross energy contents of the diet varied depending on the river water level and the food items ingested. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tambaqui; Colossoma macropomum; Stomach content; Seasonal variation; Nutritional; Value. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400009 |
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| Paparazzo,Flavio E.; Alder,Viviana A.; Schloss,Irene R.; Bianchi,Alejandro; Esteves,Jose L.. |
| The Drake Passage (DP) links the Southern Pacific and Atlantic Oceans, and acts as a physical narrowing for the largest current of the World Ocean, the Antarctic Circumpolar Current (ACC). This result in a constriction of the main circumpolar fronts related to the ACC: the Subantarctic Front, the Polar Front, the Southern Antarctic Circumpolar Current Front and the Continental Water Boundary Front. Previous studies showed that the DP is a high-nutrient low-chlorophyll (HNLC) region, but studies on the interannual and seasonal macronutrients' fluctuations in relation with chlorophyll and frontal areas in the DP are scarce. This study analyzes the spatial and temporal trends of nitrate, phosphate, and silicate on surface samples from 113 oceanographic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nitrate; Phosphate; Silicate; Chlorophyll-a; Temperature; Salinity; Antarctic fronts; Antarctic zones; Seasonal variation; Interannual variation. |
| Ano: 2016 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2016000100004 |
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| Méndez-Galeano,Miguel A.; Calderón-Espinosa,Martha L.. |
| ABSTRACT Low thermal quality environments, such extreme latitudes or high elevation regions, are highly expensive for reptiles in terms of thermoregulation. Thus, physiological adaptations or behavioral adjustments to live in these habitats have evolved in some species. Anolis heterodermus (Duméril, 1851) is an anole lizard that lives at high elevations in the Andes region. In this paper, we attempted to elucidate the thermoregulation strategy of a population of this species from the eastern cordillera of Colombia during wet and dry seasons. We measured body temperatures (Tb), operative temperatures (Te) and preferred temperatures (Tpref). Based on these data, we obtained accuracy ( b ), environmental thermal quality ( e ) and efficiency of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Thermal quality; Thermoregulatory accuracy; Seasonal variation; Heliothermy. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212017000100218 |
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| Filogonio,Renato; Del Lama,Fernanda S.; Machado,Leonardo L.; Drumond,Michelle; Zanon,Isabella; Mezzetti,Nathália A.; Galdino,Conrado A. B.. |
| We studied the influence of seasonality on the daily activity pattern and microhabitat use of three sympatric lizard species, Cnemidophorus ocellifer Spix, 1825 (Teiidae), Tropidurus montanus Rodrigues, 1987 and Eurolophosaurus nanuzae (Rodrigues, 1981) (Tropiduridae), in an area of campos rupestres (rocky fields) habitat in state of Minas Gerais, Brazil. Cnemidophorus ocellifer exhibited low density and activity concentrated within the hottest hours of the day, and was observed mainly on shaded rocks. Tropidurus montanus and E. nanuzae had similar activity patterns that did not vary between seasons. Activity of T. montanus was related to environmental temperatures. However, we did not find such relationships for E. nanuzae during the dry season. Both T.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Activity patterns; Seasonal variation; Cnemidophorus ocellifer; Tropidurus montanus; Eurolophosaurus nanuzae. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212010000400008 |
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| EVANGELISTA, B. A.; ENEAS, J. S. M.; SILVA, F. A. M. da; SIMON, J.; DIAS, T. S. dos S.. |
| A variabilidade do tempo e clima é fator de risco de perda de rendimento das lavouras, especialmente em cultivos de sequeiro. O objetivo desta pesquisa foi indicar as épocas de plantio com baixos riscos da cultura do maracujá de sequeiro, com muda tradicional com cerca de 0,30 m de altura, no Estado do Tocantins. Utilizou-se o modelo SARRA (Systeme d’Analyse Regionale des Risques Agroclimatiques), no qual foi incorporado variáveis de clima, solo e da fenologia da cultura para estimar o balanço hídrico da cultura. Para avaliar o risco de perda de rendimento por restrição hídrica, foram simulados plantios decendiais em solos arenosos, de textura média e argilosos. Utilizaram-se os Índices de Satisfação das Necessidades de Água da cultura (ISNA), estimado... |
| Tipo: Folhetos |
Palavras-chave: Modelagem agroclimática; Análise espacial; Tocantins; Selo ODS 2; Objetivos de desenvolvimento sustentável; Zoneamento Climático; Maracujá; Passiflora Edulis; Balanço Hídrico; Agricultural zoning; Agroclimatology; Passion fruits; Seasonal variation; Climatic zones; Planting date. |
| Ano: 2023 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1160297 |
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| Registros recuperados: 47 | |
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