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| Registros recuperados: 208 | |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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. |
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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 |
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| 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 < 0,001, n = 4). A densidade fitoplanctônica foi elevada, sendo... |
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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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 208 | |
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