Structure and phylogeography of two tropical predators, spinner (Stenella longirostris ) and pantropical spotted (S. attenuata ) dolphins, from SNP data

Royal Society Open Science
Matthew S Leslie, Phillip A Morin

Abstract

Little is known about global patterns of genetic connectivity in pelagic dolphins, including how circumtropical pelagic dolphins spread globally following the rapid and recent radiation of the subfamily delphininae. In this study, we tested phylogeographic hypotheses for two circumtropical species, the spinner dolphin (Stenella longirostris) and the pantropical spotted dolphin (Stenella attenuata), using more than 3000 nuclear DNA single nucleotide polymorphisms (SNPs) in each species. Analyses for population structure indicated significant genetic differentiation between almost all subspecies and populations in both species. Bayesian phylogeographic analyses of spinner dolphins showed deep divergence between Indo-Pacific, Atlantic and eastern tropical Pacific Ocean (ETP) lineages. Despite high morphological variation, our results show very close relationships between endemic ETP spinner subspecies in relation to global diversity. The dwarf spinner dolphin is a monophyletic subspecies nested within a major clade of pantropical spinner dolphins from the Indian and western Pacific Ocean populations. Population-level division among the dwarf spinner dolphins was detected-with the northern Australia population being very different ...Continue Reading

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Methods Mentioned

BETA
biopsy
biopsies
electrophoresis
genotyping
PCA

Software Mentioned

FigTree
Beauti
DAPC
Adegenet
DensiTree
SNAPP
custom
R
R package Adegenet
strataG

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