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| Registros recuperados: 10 | |
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| Zalmon,Ilana Rosental; Krohling,Werther; Ferreira,Carlos Eduardo Leite. |
| Harbor terminals and urban sewage effluents affect the composition and distribution of epibenthic organisms. In this study, we hypothesized that the benthic community structure at the Vitoria Harbor changes spatially in a ~3 km scale, and that these changes are associated with environmental gradients resulting from point-source sewage and differences in the physical and chemical parameters of the water along the harbor access channel. Four sites, internal (PI), intermediate-internal (PMI), intermediate-external (PME) and external (PE), varying from 0.5 to 4.0 km off the harbor, were sampled on five quadrats at six sampling dates (N = 30 per site). The epibenthic community on the shallow sublitoral rocky shore was sampled fortnightly from December 2005 to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Epibenthic community; Environmental gradient; Estuary; Sedimentation. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000500012 |
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| Oliveira,Pollyana Yvonica de; Souza,Jorge Luiz Pereira de; Baccaro,Fabricio Beggiato; Franklin,Elizabeth. |
| In Amazonia, topographical variations in soil and forest structure within "terra-firme" ecosystems are important factors correlated with terrestrial invertebrates' distribution. The objective of this work was to assess the effects of soil clay content and slope on ant species distribution over a 25 km² grid covering the natural topographic continuum. Using three complementary sampling methods (sardine baits, pitfall traps and litter samples extracted in Winkler sacks), 300 subsamples of each method were taken in 30 plots distributed over a wet tropical forest in the Ducke Reserve (Manaus, AM, Brazil). An amount of 26,814 individuals from 11 subfamilies, 54 genera, 85 species and 152 morphospecies was recorded (Pheidole represented 37% of all... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beta diversity; Environmental gradient; Formicidae; Soil texture; Tropical forest. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000800008 |
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| Sánchez Soto, Bardo Heleodoro. |
| Las islas continentales de Sinaloa difieren en forma, geología, topografía, clima y biología, por tanto pudieran ser varios los factores que determinan la composición y estructura de las comunidades vegetales que ahí habitan. Esta investigación, realizada en 16 islas del estado, tiene como objetivos: 1) ajustar modelos especies-área para evaluar la importancia de las variables biogeográficas en la predicción de la riqueza de especies vegetales, con base en muestreo de campo y datos publicados sobre la flora de cinco islas de la entidad, y 2) esclarecer las relaciones entre medio y vegetación en 16 islas, con ayuda de análisis multivariables de clasificación y ordenación. El modelo exponencial y la función potencial, dan valores de R2 entre 0.20 y 0.25,... |
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Palavras-chave: Relación especies-área; Islas de Sinaloa; Gradiente ambiental; Riqueza vegetal; Factores geomorfológicos y edáficos; Species-area relationship; Islands of Sinaloa; Environmental gradient; Vegetal richness; Geomorphological and edaphic factors; Botánica; Doctorado. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/781 |
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| Pinto,Marcelo Fett; Nabinger,Carlos; Boldrini,Ilsi Iob; Ferreira,Pedro Maria de Abreu; Setubal,Robberson Bernal; Trevisan,Rafael; Fedrigo,Jean Kássio; Carassai,Igor Justin. |
| Few studies have adequately described the floristic and structural features of natural grasslands associated with shallow basalt soils in southern Brazil. This study was carried out on natural grazing land used for livestock production in the municipality of Santana do Livramento, in the Campanha region of the state of Rio Grande do Sul, Brazil. The aim of the study was to describe the floristic and structural diversity of the area. The floristic list obtained comprises 229 plant taxa from 40 botanical families, with a predominance of the families Poaceae (62), Asteraceae (28), Fabaceae (16) and Cyperaceae (12). The estimated diversity and evenness in the community were 3.00 and 0.874, respectively. Bare soil and rock outcrops accounted for 19.3% of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diversity; Richness; Pampa biome; Forage species; Environmental gradient. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000100017 |
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| Qian, Hong; Jin, Yi; Leprieur, Fabien; Wang, Xianli; Deng, Tao. |
| A full understanding of the origin and maintenance of β‐diversity patterns in a region requires exploring the relationships of both taxonomic and phylogenetic β‐diversity (TBD and PBD, respectively), and their respective turnover and nestedness components, with geographic and environmental distances. Here, we simultaneously investigated all these aspects of β‐diversity for angiosperms in China. Specifically, we evaluated the relative importance of environmental filtering vs dispersal limitation processes in shaping β‐diversity patterns. We found that TBD and PBD as quantified using a moving window approach decreased towards higher latitudes across the whole of China, and their turnover components were correlated with latitude more strongly than their... |
| Tipo: Text |
Palavras-chave: Environmental gradient; Flowering plant; Latitudinal gradient; Species turnover. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00641/75343/76076.pdf |
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| Maçaneiro,João Paulo de; Oliveira,Laio Zimermann; Seubert,Rafaela Cristina; Eisenlohr,Pedro V.; Schorn,Lauri Amândio. |
| ABSTRACT The effect of environmental variables on the plant species distribution in the Atlantic Forest raises the interest of researchers, but few studies, mainly at local scales, analyzed the influence of spatial factors on the environment and species distribution. Linear models and spatial correlograms were used to evaluate whether environment and space may predict variations in species composition of trees and shrubs in a Subtropical Rainforest remnant. The study area was divided in 25 plots of 400 m², systematically distributed, where individuals with DBH ≥ 5 cm were measured. Elevation and slope were the most important predictors of the floristic variations, but space, generally neglected in researches on South American's vegetation, had a relevant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantic Forest; Environmental gradient; Linear models; Species distribution; Variance partitioning. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000200183 |
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| Alves-da-Silva,Sandra Maria; Cabreira,Josemari da Cruz; Voos,José Guilherme; Lobo,Eduardo Alcayaga. |
| The objective of this study was to evaluate the taxonomic composition and richness of the genera Trachelomonas and Strombomonas (pigmented Euglenophyceae) in a subtropical urban lake (30º03'05"S; 51º10'34"W) within the Botanical Garden, in the city of Porto Alegre, located in the state of Rio Grande do Sul, Brazil, in order to contribute to the floristic knowledge of Euglenophyta in artificial urban lakes. From July 2007 to June 2008, we collected samples monthly from two sampling stations, using a 25-µm mesh plankton net. The samples were preserved in 4% formaldehyde. We evaluated the following environmental variables related to the water in the lake: ammonia content, silica content, organic matter content, dissolved oxygen concentration, temperature, pH,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Euglenophyta; Environmental gradient; Shallow lake; Species richness; Southern Brazil. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000300010 |
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| Registros recuperados: 10 | |
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