Multifactorial genetic divergence processes drive the onset of speciation in an Amazonian fish.

ABSTRACT: Understanding the processes that drive population genetic divergence in the Amazon is challenging because of the vast scale, the environmental richness and the outstanding biodiversity of the region. We addressed this issue by determining the genetic structure of the widespread Amazonian common sardine fish Triportheus albus (Characidae). We then examined the influence, on this species, of all previously proposed population-structuring factors, including isolation-by-distance, isolation-by-barrier (the Teotônio Falls) and isolation-by-environment using variables that describe floodplain and water characteristics. The population genetics analyses revealed an unusually strong structure with three geographical groups: Negro/Tapajós rivers, Lower Madeira/Central Amazon, and Upper Madeira. Dist

SUBMITTER: Jardim de Queiroz L 

PROVIDER: S-EPMC5738069 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature