Contrasting Patterns of Gene Flow for Amazonian Snakes That Actively Forage and Those That Wait in Ambush

• Autor(a) principal: Fraga, Rafael de
• Data de Publicação: 2017
• Outros Autores: Lima, Albertina Pimental, Magnusson, William Ernest, Ferrão, Miquéias, Stow, Adam J.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional do INPA
• Texto Completo: https://repositorio.inpa.gov.br/handle/1/15725
• topic: Animals Tissue; Climate; Forager; Foraging; Gene Flow; Gene Structures; Genetic Algorithm; Genetic Distance; Genetic Similarity; Genetic Variation; Genotype; Homozygote; Mosaicism; Nonhuman; Priority Journal; Seasonal Variation; Polymorphism, Single Nucleotide; Snake; Animals; Animals Dispersal; Brasil; Environment; Genetics; Physiology; Predation; Animals Distribution; Animal; Brasil; Environment; Gene Flow; Predatory Behavior; Snakes

Knowledge of genetic structure, geographic distance and environmental heterogeneity can be used to identify environmental features and natural history traits that influence dispersal and gene flow. Foraging mode is a trait that might predict dispersal capacity in snakes, because actively foragers typically have greater movement rates than ambush predators. Here, we test the hypothesis that 2 actively foraging snakes have higher levels of gene flow than 2 ambush predators. We evaluated these 4 co-distributed species of snakes in the Brazilian Amazon. Snakes were sampled along an 880 km transect from the central to the southwest of the Amazon basin, which covered a mosaic of vegetation types and seasonal differences in climate. We analyzed thousands of single nucleotide polymorphisms to compare patterns of neutral gene flow based on isolation by geographic distance (IBD) and environmental resistance (IBR). We show that IBD and IBR were only evident in ambush predators, implying lower levels of dispersal than the active foragers. Therefore, gene flow was high enough in the active foragers analyzed here to prevent any build-up of spatial genotypic structure with respect to geographic distance and environmental heterogeneity. © The American Genetic Association 2017. All rights reserved.