Population genetic structure and demographic history of the spadefish, Chaetodipterus faber (Ephippidae) from Southwestern Atlantic

Made available in DSpace on 2018-11-26T17:16:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-02-01 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundacao de Amparo Pesquisa e Inovacao do Espirito Santo Programa de Pos-graduacao em Biodiversidade Tropical (CEUNES/UFES) Programa de Pos-graduacao em Ciencias Biologicas-Zoologia (IBB/UNESP) Instituto Chico Mendes de Conservacao da Natureza Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Genetic diversity, population structure and demographic history of Chaetodipterus faber in SW Atlantic were investigated using mitochondrial DNA cytochrome c oxidase subunit 1(620 bp) and D-loop (817 bp) sequences. Individuals were collected in five sampling units (SUs) located in latitudes between 2 degrees S and 27 degrees S, southernmost limit of species distribution. The COI sequences from Brazilian sampling units were compared with eight sequences from the Gulf of Mexico and Caribbean, resulting in no significant genetic differences (K2P < 0.32%). On the contrary, pairwise F-ST analysis based on D-loop datasets from the five SUs indicated divergence between Tropical and Subtropical clades of SW Atlantic C. faber. The SAMOVA approach was consistent with this divergence and revealed maximal variance among groups (63.59%) when two clades are simulated (k = 2), setting apart Tropical and Subtropical SUs. Demographic analyses support the hypothesis of population expansion, both for Tropical and Subtropical clades. Moreover, Subtropical population size increase was dated after the Tropical clade reached the demographic stability, around 10 kyr ago, during the beginning of interglacial Pleistocene Holocene transition. The historical demographic results, along with the lower genetic diversity and the star shaped haplotype network of the Subtropical clade corroborate an ancient scenario of the species' adaptive radiation southward. (C) 2016 Elsevier B.V. All rights reserved. Univ Fed Espirito Santo, PPGBT DCAB CEUNES, Rodovia BR 101 Norte,Km 60, BR-29932540 Sao Mateus, ES, Brazil Univ Fed Espirito Santo, PPGOAM DOC CCHN, Base Oceanog UFES, Caixa Postal 2030, BR-29199970 Aracruz, ES, Brazil Univ Fed Estado Rio de Janeiro, LICTA, Av Pasteur 458, BR-22290240 Rio De Janeiro, RJ, Brazil Pontificia Univ Catolica Minas Gerais, Lab Genet Conservacao, Programa Posgrad Biol Vertebrados, Av Dom Jose Gaspar 500, BR-30535901 Belo Horizonte, MG, Brazil Univ Estadual Paulista, Inst Biociencias, Dept Morfol, BR-18618970 Botucatu, SP, Brazil Univ Estadual Paulista, Inst Biociencias, Dept Morfol, BR-18618970 Botucatu, SP, Brazil CNPq: CNPq: 350311/2012-9 Fundacao de Amparo Pesquisa e Inovacao do Espirito Santo: FAPES: 54515130/2011 Instituto Chico Mendes de Conservacao da Natureza: SISBIO: 38970-1