Population structure, phylogeography, and genetic diversity of the common bottlenose dolphin in the tropical and subtropical southwestern Atlantic Ocean

We assessed the level of genetic variability and population structure of the common bottlenose dolphin (Tursiops truncatus) in the tropical and subtropical portions of the southwestern Atlantic Ocean and compared the results with previous morphological findings. We analyzed 109 samples of common bot...

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Veröffentlicht in:Journal of mammalogy 2019-04, Vol.100 (2), p.564-577
Hauptverfasser: de Oliveira, Larissa Rosa, Fraga, Lúcia D., Ott, Paulo H., Siciliano, Salvatore, Lopes, Fernando, Almeida, Raquel, Wickert, Janaína C., Milmann, Lucas, Danilewicz, Daniel, Emin-Lima, Neusa Renata, Meirelles, Ana Carolina, Luz, Vitor, do Nascimento, Lídio França, de Thoisy, Benoit, Tavares, Maurício, Zerbini, Alexandre N., Baumgarten, Melina, Valiati, Victor Hugo, Bonatto, Sandro L.
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container_end_page 577
container_issue 2
container_start_page 564
container_title Journal of mammalogy
container_volume 100
creator de Oliveira, Larissa Rosa
Fraga, Lúcia D.
Ott, Paulo H.
Siciliano, Salvatore
Lopes, Fernando
Almeida, Raquel
Wickert, Janaína C.
Milmann, Lucas
Danilewicz, Daniel
Emin-Lima, Neusa Renata
Meirelles, Ana Carolina
Luz, Vitor
do Nascimento, Lídio França
de Thoisy, Benoit
Tavares, Maurício
Zerbini, Alexandre N.
Baumgarten, Melina
Valiati, Victor Hugo
Bonatto, Sandro L.
description We assessed the level of genetic variability and population structure of the common bottlenose dolphin (Tursiops truncatus) in the tropical and subtropical portions of the southwestern Atlantic Ocean and compared the results with previous morphological findings. We analyzed 109 samples of common bottlenose dolphins that were sequenced for control region mtDNA and genotyped for seven polymorphic microsatellite loci. The results suggested that the species in this region can be separated in two major biological units, northern and southern, with an area of parapatry at southern Brazil. The northern unit seems to occur in a wide range of depths, including offshore waters, is consistent with the canonical morphology of T. truncatus, and can be divided into three management units: 1) Saint Paul's Rocks, 2) north and northeast of Brazil, and 3) Campos and Santos Basins (that extend at least to southernmost Brazil). The southern unit is coastal, occurring exclusively in very shallow waters (< 10 m) and estuaries, and is consistent with the previously described (putative) Tursiops gephyreus. Nevertheless, a formal decision on the taxonomic status of T. gephyreus should wait for a more geographically comprehensive and data-integrative study.
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source Jstor Complete Legacy; Oxford University Press Journals All Titles (1996-Current); Alma/SFX Local Collection
subjects biological conservation
Brazilian coast
cetaceans
ecotypes
Feature Articles
genetic diversity
microsatellites
mtDNA
title Population structure, phylogeography, and genetic diversity of the common bottlenose dolphin in the tropical and subtropical southwestern Atlantic Ocean
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