Canonical Correspondence Analysis Cca
Mostrando 1-12 de 39 artigos, teses e dissertações.
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1. Effect of fire under the soils on the organization of communities of three remnants of Amazonian savannas
ABSTRACT Areas of cerrado (Brazilian savanna) in the Amazon have been poorly studied from the perspective of fire impacts on environmental sustainability, especially with regard to disturbances to soil and vegetation structure. This study aimed to analyze the influence of edaphic variables and fire together on the composition and structure of tree and shrub
Acta Bot. Bras.. Publicado em: 2020-09
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2. A mata ripária influencia a composição e estrutura da comunidade zooplanctônica de poças temporárias?
RESUMO Poças temporárias são importantes ampliadores da biodiversidade local, sobretudo em áreas florestadas estacionais. Alterações na cobertura vegetal ao longo das margens desses corpos hídricos podem alterar a composição e estrutura da sua comunidade zooplanctônica. Nesse sentindo, testamos a hipótese de que a presença de mata ripária altera
Iheringia, Sér. Zool.. Publicado em: 11/11/2019
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3. Habitat, limnological signatures and spatial modeling: a zoning proposal for the Curuá-Una hydroelectric reservoir, Pará, Brazil
Resumo Objetivo O objetivo deste trabalho é caracterizar, modelar espacialmente e realizar o zoneamento do ambiente aquático no reservatório da UHE de Curuá-Una, no estado do Pará, na Amazônia brasileira. Métodos Os dados foram coletados em 77 pontos amostrais distribuídos em 20 transectos no reservatório de Curuá-Una, no mês de novembro de 20
Acta Limnol. Bras.. Publicado em: 05/09/2019
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4. Influence of Edaphic Attributes on the Distribution of Tree Species in a Riparian Forest in Southern Brazil
ABSTRACT This study aims at identifying the formation of clusters and to evaluate the influence of chemical attributes in the soil on the groups and species in a riparian forest fragment in Campos de Cima da Serra, Rio Grande do Sul (RS). Thirteen plots (10 × 20 m) were demarcated to carry out the study. Forest inventory data were employed in a multivariate
Floresta Ambient.. Publicado em: 29/07/2019
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5. Soil-vegetation relationships and community structure in a "terra-firme"-white-sand vegetation gradient in Viruá National Park, northern Amazon, Brazil
ABSTRACT Viruá National Park encompasses a vast and complex system of hydromorphic sandy soils covered largely by the white sand vegetation ("Campinarana") ecosystem. The purpose of this study was to investigate a vegetation gradient of "terra-firme"-white sand vegetation at the Viruá National Park. Nine plots representing three physiognomic units were ins
An. Acad. Bras. Ciênc.. Publicado em: 15/05/2017
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6. Vascular epiphytic flora of a high montane environment of Brazilian Atlantic Forest: composition and floristic relationships with other ombrophilous forests
ABSTRACT Only a few studies regarding vascular epiphytes have been conducted in mixed ombrophilous forests (MOF) in Serra da Mantiqueira, a mountainous environment in the Brazilian Atlantic Forest, where the relationships of epiphytic flora with other physiognomies are unknown. This study aimed to survey the epiphytes of a MOF remnant located in Serra da Man
Acta Bot. Bras.. Publicado em: 22/08/2016
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7. Relationships between structure of the tree component and environmental variables in a subtropical seasonal forest in the upper Uruguay River valley, Brazil
This study aimed to analyze relationships among the structure of the tree component, edaphic variables and canopy discontinuity along a toposequence in a seasonal upland (hillside) forest in southern Brazil. Soil and vegetation were sampled in 25 plots of 20 × 20 m each. We described the vegetation in terms of structure, richness and diversity, as well as b
Acta Bot. Bras.. Publicado em: 2013-12
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8. Do edaphic aspects alter vegetation structures in the Brazilian restinga?
The vegetation of the Brazilian restinga (coastal woodland) presents a variety of species and different characteristics, encompassing fields, fruit groves and forests on quartzarenic neosols. We hypothesised that the structure of the restinga landscape along the coast of the state of Piauí is influenced by edaphic factors and presents a pattern similar to t
Acta Bot. Bras.. Publicado em: 2013-09
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9. Avaliação da contaminação de córregos de Cerrado por metais pesados utilizando-se larvas de Odonata como bioindicadores / Assessment of heavy metal contamination in Brazilian savannas streams using Odonata larvae as bioindicators
The aquatic ecosystems are the main receptors of pollutants and contaminants from industrial and agricultural activities and of the discharge of sewage. Among the various substances potentially harmful, heavy metals are a threat to the aquatic ecosystems and the biota. This research aimed to evaluate the contamination of Cerrados streams by heavy metals usin
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
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10. Diversity and microdistribution of black fly (Diptera: Simuliidae) assemblages in the tropical savanna streams of the Brazilian cerrado
We describe the abiotic factors affecting the distribution of black flies at a microhabitat scale, rather than at the regional scale usually present in the literature on the Neotropics. Black fly larvae were sampled from the Tocantins River and three tributaries, located in the Brazilian savanna (state of Tocantins, Brazil) during six bi-monthly sampling per
Memórias do Instituto Oswaldo Cruz. Publicado em: 2012-05
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11. Soil profile, relief features and their relation to structure and distribution of Brazilian Atlantic rain forest trees
In tropical forests, the environmental heterogeneity can provide niche partitioning at local scales and determine the diversity and plant species distribution. Thus, this study aimed to investigate the variations of tree species structure and distribution in response to relief and soil profile features in a portion of the largest remnant of Brazilian Atlanti
Scientia Agricola. Publicado em: 2012-02
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12. Influência de variáveis ambientais e dinâmica de espécies lenhosas regenerantes nas matas ciliares da bacia do Rio Claro, Jataí, GO / Influence of environmental variables and dynamics of woody species in riparian forests regenerating the basin of the Rio Claro, Jatai, GO
(Efeitos do solo na estrutura da comunidade e distribuição de espécies regenerantes nas matas ciliares da Bacia do Rio Claro, Jataí, GO). O estudo foi realizado em dois remanescentes de mata ciliar na Bacia do Rio Claro, sudoeste goiano, e teve o objetivo de verificar as variações da estrutura e distribuição de espécies regenerantes e possíveis cor
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/08/2011