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Environmental severity promotes phylogenetic clustering in campo rupestre vegetation Acta Botanica
Miazaki,Angela S.; Gastauer,Markus; Meira-Neto,João A.A..
The stress-dominance hypothesis postulates that the importance of competition in plant communities declines with increasing environmental stress while the importance of environmental filters increases. To test this hypothesis for campo rupestre vegetation, we analyzed phylogenetic diversity and community structure of angiosperm communities at two study sites within the Itacolomi State Park, Minas Gerais, Brazil. Plots representing more favorable habitats, such as those with a higher percentage of rocky outcrops that might permit the tapping of deeper water and nutrient resources as well as higher contents of clay and loam thereby increasing water and nutrient availability, show higher phylogenetic diversity and therefore lower phylogenetic clustering than...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Angiosperm community composition; Environmental filtering; Faith's Index of phylogenetic diversity; Mean Nearest Taxon Index; Mean Pairwise Distance; Nearest Taxon Index; Net Relatedness Index; Phylogenetic community analysis.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000400561
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Assessing the spatial variation of functional diversity estimates based on dendrograms in phytoplankton communities Acta Botanica
Machado,Karine Borges; Teresa,Fabrício Barreto; Nabout,João Carlos.
ABSTRACT Variation in phytoplankton functional diversity is partioned and mapped using several indices and linkage methods based on dendrograms. The relationships between diversity metrics and major environmental predictors, including zooplankton density, were assessed in 29 phytoplankton communities of floodplain lakes distributed along the Middle Araguaia River in central Brazil. The dendrogram-based functional diversity indices were Functional Group Richness, Functional Diversity, Mean Pairwise Distance and Mean Nearest Taxon Distance, whereas seven different hierarchical agglomerative linkage methods we used. The performance of indices were compared using ANOVA and their spatial variation in response to major environmental predictors evaluated. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Araguaia River; Functional traits; Linkage method; Mean Nearest Taxon Distance; Mean Pairwise Distance.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000400571
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