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Type: Journal article
Title: Rates of population differentiation and speciation are decoupled in sea snakes
Author: Nitschke, C.
Hourston, M.
Udyawer, V.
Sanders, K.
Citation: Biology Letters, 2018; 14(10):1-6
Publisher: Royal Society
Issue Date: 2018
ISSN: 1744-9561
Statement of
Charlotte R. Nitschke, Mathew Hourston, Vinay Udyawer and Kate L. Sanders
Abstract: Comparative phylogeography can inform many macroevolutionary questions, such as whether species diversification is limited by rates of geographical population differentiation. We examined the link between population genetic structure and species diversification in the fully aquatic sea snakes (Hydrophiinae) by comparing mitochondrial phylogeography across northern Australia in 16 species from two closely related clades that show contrasting diversification dynamics. Contrary to expectations from theory and several empirical studies, our results show that, at the geographical scale studied here, rates of population differentiation and speciation are not positively linked in sea snakes. The eight species sampled from the rapidly speciating Hydrophis clade have weak population differentiation that lacks geographical structure. By contrast, all eight sampled Aipysurus-Emydocephalus species show clear geographical patterns and many deep intraspecific splits, but have threefold slower speciation rates. Alternative factors, such as ecological specialization, species duration and geographical range size, may underlie rapid speciation in sea snakes.
Keywords: Australia
sea snake
Rights: © 2018 The Author(s) Published by the Royal Society. All rights reserved.
DOI: 10.1098/rsbl.2018.0563
Grant ID: ARC
Appears in Collections:Aurora harvest 3
Zoology publications

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