Navegando por Palavras-chave "Climatic niche"

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    Padrões e processos envolvidos na distribuição altitudinal de aves montanas da Mata Atlântica: Microspingus como modelos de estudo
    (Universidade Federal de São Paulo, 2018-04-25) Neves, Marcel Fernandes [UNIFESP]; Amaral, Fábio Sarubbi Raposo do [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    Several biotic and abiotic factors may influence species distribution patterns. Montane environments may represent barriers to species dispersal, especially in the tropics where isolation and allopatric speciation are favored in comparison to temperate environments, as hypothesized by Janzen (1967). Two allopatric sister species of montane birds of Atlantic forest present distinct patterns of altitudinal distribution, which can be explained by differences in bioclimatic niches, differences in climatic conditions related to altitude in different latitudes where species occur, or both. Here we test these hypotheses, evaluating niche conservatism (PNC) or niche divergence (PND) using the MO (Multidimensional Overlap) metric associated to the null model RTR (Rotation and Translocation Random model, Nunes & Pearson, 2016), as well as a comparative analysis between the top and bottom bioclimatic conditions in different latitudes of mountain ranges of southern and southeastern Brazil. The results suggest PND among the species, indicating that the divergence in the species niche explains the difference in the altitudinal distribution, despite their recent divergence. The top and bottom bioclimatic conditions are significantly different in most of the variables tested, which may also explain the divergence in the altitudinal distribution pattern. These results suggest that the pattern described by Janzen (1967) can be observed in a smaller latitudinal scale than the one proposed by the author, between the mountains of the south and southeast of Brazil. These results indicate that ecologic divergence may be especially important in the generation of distribution patterns in the Atlantic Forest. Keywords: Adaptation; niche divergence; climatic niche; montane environments; subtropical rainforests.