Navegando por Palavras-chave "Mata Atlântica montana"

Agora exibindo 1 - 1 de 1
  • Imagem de Miniatura
    Item
    Acesso aberto (Open Access)
    Ilhas de floresta nas alturas: inferindo processos históricos associados às distribuições de aves montanas da Mata Atlântica
    (Universidade Federal de São Paulo, 2015-07-31) Montesanti, Julia de Almeida Costa [UNIFESP]; Amaral, Fábio Sarubbi Raposo do [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    The mountains of the Brazilian Atlantic Forest have a high degree of endemism and its biogeographical history is poorly explored. One hypothesis for the diversification of montane organisms, related to the refuge theory, relies on the change of their altitudinal range in response to historical climate fluctuations. Under this hypothesis, montane species would expand their population to lower altitude areas during the glacial periods, whereas the isolation in high altitude areas during interglacial periods (as the present) could lead to differentiation and speciation. In this work we used Ecological Niche Modeling (ENM) to test this hypothesis. We selected 13 montane species from the Atlantic Forest as models: Asthenes moreirae, Carpornis cucullata, Drymophila genei, Dysithamnus xanthopterus, Hemitriccus obsoletus, Phylloscartes difficilis, Poospiza cabanisi, Poospiza lateralis, Poospiza thoracica, Stephanophorus diadematus, Stephanoxis lalandi, Stephanoxis loddigesii e Tijuca atra. For all species, the projections of ENMs for the Last Glacial Maximum (LGM; about 21,000 years ago) indicated broader distributions compared to the present, supporting the hypothesis of interglacial refuges for montane species. In addition, for the species/populations with alopatric distribution in distinct mountain ranges in southern and southeastern Brazil, the models indicated a potential connection during the LGM. However, the models presented variation on the location and geographic coverage, according to each species. The results suggest that climatic fluctuations may have affected in a predictably way part of the montane avifauna of southern and southeastern Brazil. Species-specific ecological features are possibly related to differences in the responses to the same historical events.