Abstract
The region recognized as the Rondônia area of endemism is one of the most threatened in the Brazilian Amazon. In addition to rampant deforestation that took place during the 1980s and 1990s, it is now the locus of infrastructure development and economic expansion. However, the patterns of species distribution and diversity in this region are much more complex than previously recognized. Patterns of distribution of birds, primates, and butterflies strongly suggest that the Rondônia area of endemism is not biogeographically homogenous. On opposite banks of the Madeira tributaries, in particular the Aripuanã and Jiparaná rivers, there are genetically, morphologically, and vocally distinct bird populations with restricted distributions and geographic substitution. These areas are relatively small and already highly threatened by deforestation and economic development. Up to 70 % of the Jiparaná basin has been deprived of its original forest cover. Thus, their unique populations deserve to be recognized as conservation priorities and urgently included in conservation planning blueprints. Many restricted taxa, including many yet to be described, may already be highly endangered or locally extinct. Conservation planning in the Brazilian Amazon directed at specifying areas to be protected has focused on the larger proposed areas of endemism. If fine-scale endemism in threatened areas does exist in other Amazonian regions, then conservation policies that do not recognize these patterns will not adequately protect regional diversity.
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Acknowledgments
This work has been supported by an overseas doctoral fellowship from the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq 290034/2008-12) and a postdoctoral fellowship from the same agency (CNPq 150842/2012-0). Gustavo A. B. da Fonseca, Fernanda A. Carvalho, Theodor C. H. Cole, and Mariana M. Vale have provided skillful advice regarding this manuscript. Mario Cohn-Haft introduced me to Amazonian ornithology and generously shared his knowledge of the Rondônia region.
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Fernandes, A.M. Fine-scale endemism of Amazonian birds in a threatened landscape. Biodivers Conserv 22, 2683–2694 (2013). https://doi.org/10.1007/s10531-013-0546-9
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DOI: https://doi.org/10.1007/s10531-013-0546-9