Landscape configuration of an Amazonian island-like ecosystem drives population structure and genetic diversity of a habitat-specialist bird

Abstract Context Amazonian white-sand ecosystems ( campinas ) are open vegetation patches which form a natural island-like system in matrix of tropical rainforest. Due to clear distinction from the surrounding matrix, spatial characteristics campina may affect genetic diversity and composition their specialized organisms, such as small endemic passerine Elaenia ruficeps . Objectives To estimate relative contribution current extension, configuration geographical context patterns population structure E. Methods We sampled individuals three landscapes central Amazonia with contrasting distribution, large connected isolated patches. estimated structure, diversity, contemporary historical migration within among used landscape metrics predictor variables. Furthermore, we isolation by distance resistance landscapes. Results identified genetically distinct populations asymmetrical gene flow decreasing rate distance. Within each landscape, found low differentiation without nor resistance. In contrast, correlation between Conclusions Together previous studies, dynamics suggests that both regional shape connectivity specialist birds. Also, distribution landscapes, together associated biota, has changed response climatic changes Late Pleistocene.