Article thumbnail

Speciation of two stingrays with antitropical distributions: low levels of divergence in mitochondrial DNA and morphological characters suggest recent evolution

By A. Le Port, M.D.M. Pawley and S.D. Lavery

Abstract

Disjunct geographic distributions across the equator (antitropicality) occur in many marine and terrestrial taxa. However, their origin and role in forming new species is still poorly understood. Here we examine the phylogenetic relationships and levels of genetic and morphological divergence in 2 stingray species, the Southern Hemisphere Dasyatis brevicaudata and the Northern Hemisphere D. matsubarai, with antitropical distributions and suspected conserved morphological traits. Analyses of concatenated mtDNA sequences (3160 bp dataset: CO1, cytochrome b, control region) suggest D. brevicaudata and D. matsubarai are closely related sister lineages, with low levels of sequence divergence more akin to intra- rather than interspecific comparisons. Multivariate analyses of morphological traits are largely consistent with the genetic data in showing small but discrete differences in morphometric characteristics, allowing Northern and Southern Hemisphere individuals to be separated into 2 groups. We suggest that D. brevicaudata and D. matsubarai are closely related sister taxa that may represent an early stage in the process of allopatric speciation

Publisher: Inter-Research
Year: 2013
DOI identifier: 10.3354/ab00518
OAI identifier: oai:researchonline.jcu.edu.au:35181
Provided by: ResearchOnline@JCU
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://researchonline.jcu.edu.... (external link)
  • http://dx.doi.org/10.3354/ab00... (external link)
  • http://researchonline.jcu.edu.... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.