Amphibian Beta Diversity in the Brazilian Atlantic Forest: Contrasting the Roles of Historical Events and Contemporary Conditions at Different Spatial Scales

Autor(es)

da Silva, Fernando Rodrigues ^[1] ; Almeida-Neto, Mario ^[2] ; Nicolosi Arena, Mariana Victorino ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Ciencias Ambientais, Sorocaba, SP - Brazil

^[2] Univ Fed Goias, Dept Ecol, Goiania, Go - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLoS One; v. 9, n. 10 OCT 8 2014.
• Citações Web of Science: 13

Resumo

Current patterns of biodiversity distribution result from a combination of historical and contemporary processes. Here, we compiled checklists of amphibian species to assess the roles of long-term climate stability (Quaternary oscillations), contemporary environmental gradients and geographical distance as determinants of change in amphibian taxonomic and phylogenetic composition in the Brazilian Atlantic Forest. We calculated beta diversity as both variation in species composition (CBD) and phylogenetic differentiation (PBD) among the assemblages. In both cases, overall beta diversity was partitioned into two basic components: species replacement and difference in species richness. Our results suggest that the CBD and PBD of amphibians are determined by spatial turnover. Geographical distance, current environmental gradients and long-term climatic conditions were complementary predictors of the variation in CBD and PBD of amphibian species. Furthermore, the turnover components between sites from different regions and between sites within the stable region were greater than between sites within the unstable region. On the other hand, the proportion of beta-diversity due to species richness difference for both CBD and PBD was higher between sites in the unstable region than between sites in the stable region. The high turnover components from CBD and PBD between sites in unstable vs stable regions suggest that these distinct regions have different biogeographic histories. Sites in the stable region shared distinct clades that might have led to greater diversity, whereas sites in the unstable region shared close relatives. Taken together, these results indicate that speciation, environmental filtering and limited dispersal are complementary drivers of beta-diversity of amphibian assemblages in the Brazilian Atlantic Forest. (AU)

• Processo FAPESP: 13/50714-0 - Influência de processos ecológicos e evolutivos na estruturação de comunidades de anfíbios em diferentes escalas espaciais e temporais
• Beneficiário: Fernando Rodrigues da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Jovens Pesquisadores
• Processo FAPESP: 11/22618-0 - Condições climáticas contemporâneas ou fatores históricos são os principais determinantes da diversidade beta de anfíbios na Mata Atlântica?
• Beneficiário: Mariana Victorino Nicolosi Arena
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica