Historical connections among river basins and climatic changes explain the biogeographic history of a water rat

Autor(es)

Dalapicolla, Jeronymo ^{[1, 2]} ; Reis Leite, Yuri Luiz ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Espirito Santo, Dept Ciencias Biol, Vitoria, ES - Brazil

^[2] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Dept Ciencias Biol, Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PeerJ; v. 6, JUL 27 2018.
• Citações Web of Science: 0

Resumo

Background. The water rat Nectomys squamipes (Cricetidae: Sigmodontinae) is a semiaquatic rodent from eastern South America that shows shallow genetic structure across space, according to some studies. We tested the influence of hydrography and climatic changes on the genetic and phylogeographic structure of this semiaquatic small mammal. Methods. DNA sequences of two mitochondrial genetic markers (Cyt b and D-loop) and six microsatellite loci from water rats were collected at 50 localities in five river basins in the Atlantic Forest along the eastern coast of South America. We evaluated the genetic structure within and among river basins, and we estimated divergence dates. Species distribution models for the present and past were built to identify possible gene flow paths. Results. Mitochondrial data and species distribution models showed coherent results. Microsatellite loci showed a more complex pattern of genetic differentiation. The diversification of N. squamipes haplotypes occurred during the Pleistocene and the river basin cannot explain most of the genetic structure. We found evidence of population expansion during the last glacial maximum, and gene flow paths indicate historical connections among rivers in the Atlantic Forest. Discussion. Historical connections among rivers in the Atlantic Forest may have allowed N. squamipes to disperse farther across and within basins, leading to shallow genetic structure. Population expansions and gene flow through the emerged continental shelf during glacial period support the Atlantis forest hypothesis, thus challenging the forest refuge hypothesis. (AU)

• Processo FAPESP: 15/02853-6 - Taxonomia integrativa do gênero Proechimys (Rodentia: Echimydae) da Amazônia Ocidental
• Beneficiário: Jeronymo Dalapicolla
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/24464-4 - Filogeografia de duas espécies simpátricas de ratos-de-espinho da Amazônia Ocidental
• Beneficiário: Jeronymo Dalapicolla
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado