Islands in a green ocean: Spatially structured endemism in Amazonian white-sand vegetationPalavras-chave

Autor(es)

Costa, Flavio M. ^[1] ; Terra-Araujo, Mario H. ^{[1, 2]} ; Zartman, Charles E. ^[1] ; Cornelius, Cintia ^[3] ; Carvalho, Fernanda A. ^[4] ; Hopkins, Michael J. G. ^[1] ; Viana, Pedro L. ^[5] ; Prata, Eduardo M. B. ^[1] ; Vicentini, Alberto ^[1]

Afiliação do(s) autor(es)

^[1] Inst Nacl de Pesquisas da Amazonia, Programa Posgrad Bot, Manaus, Amazonas - Brazil

^[2] Fac Estacio Amazonas, Manaus, Amazonas - Brazil

^[3] Univ Fed Amazonas UFAM, Inst Ciencias Biol, Dept Biol, Manaus, Amazonas - Brazil

^[4] Univ Fed Rio Grande do Norte, Ctr Biociencias, Dept Bot & Zool, Natal, RN - Brazil

^[5] Museu Paraense Emilio Goeldi, Coordenacao Bot, Belem, Para - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Biotropica; v. 52, n. 1 DEC 2019.
• Citações Web of Science: 0

Resumo

Here, we examine the influence of the spatial distribution of open white-sand campina (WSC) in the Amazon on the species richness and beta diversity of their vascular plants. It is well known that beta diversity tends to increase with geographical distance, but the influence of habitat insularity on floristic composition and endemism is still unclear. We surveyed WSC in central and southwestern Amazon, generating lists of species occurrences by rapid-inventory techniques to evaluate the influence of island area and connectivity on alpha and beta diversity among five landscapes in the Amazon Basin. Effects of insularity were assessed by comparing alpha and beta diversity within and among landscapes. A high proportion of species (74%) and genera (50%) were restricted to only one of the five landscapes and only three species and 28 genera were shared among all landscapes. At the regional scale, beta diversity increased significantly with distance. Partitioning of beta diversity showed that landscapes of higher connectivity have greater turnover and lower nestedness. We conclude that the flora of WSC is highly structured at regional scales, while at the local scale structure is evident only in low connectivity landscapes. Landscape metrics apparently play an important role in shaping patterns of diversity regionally as a result of processes operating at larger geographical scales. This emphasizes that conservation policy should not be local in its geographical focus and should account for connectivity at larger scales. This study is the first to empirically and explicitly evaluate the pattern of endemism in lowland WSC in the Amazon. in Porteges is available with online only (AU)

• Processo FAPESP: 09/53365-0 - Áreas de vegetação aberta e ciclos climáticos na Amazônia Central: padrões de genética da paisagem como indicadores do fluxo gênico atual em uma paisagem naturalmente fragmentada
• Beneficiário: Jean Paul Walter Metzger
• Modalidade de apoio: Auxílio à Pesquisa - Regular