Habitat amount drives the functional diversity and nestedness of anuran communities in an Atlantic Forest fragmented landscape
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2018-12
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Natural environments disturbed by human activities can suffer from species extinctions,
but some can still harbor high taxonomic diversity. However, disturbances may
have impacts beyond the species level, if the species lost represent unique functions
in the ecosystem. In this study, we evaluated to what extent the amount of habitat
can determine the functional diversity and nestedness of amphibian communities in
an Atlantic Forest fragmented landscape in Brazil, and if there is a threshold of habitat
amount beyond which there is severe loss of functional diversity. As species responses
may depend on their habitat type, we performed the analyses for three different sets of
species: all species, forest‐dependent species, and generalist species. We also evaluated
the relative importance of turnover and nestedness components to total functional dissimilarity
among sites. Habitat amount affected functional diversity of frogs, especially
for forest‐dependent species where a linear reduction was detected. The functional
dissimilarity among sites was mostly explained by the nestedness component. The reduction
of functional diversity was mediated by an ordered loss of traits, leading to
a functionally nested metacommunity. These sensitive traits were closely related to
habits and reproductive modes that depend on rivers and streams. The maintenance of
functional diversity of frogs in fragmented landscapes must rely on the conservation of
both terrestrial and aquatic environments, as some species and their traits can disappear
from remnants of native vegetation lacking some specific habitats (e.g. streams).
Abstract in Portuguese is available with online material.
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Palavras-chave
Amphibia, Habitat loss, Conservation, Functional nestedness, Functional diversity
Citação
ALMEIDA-GOMES, Mauricio; VIEIRA, Marcus V.; ROCHA, Carlos F. D.; MELO, Adriano S. Habitat amount drives the functional diversity and nestedness of anuran communities in an Atlantic Forest fragmented landscape. Biotropica, Nova Jersey, v. 51, p. 874-884, Dec. 2018.