Effects of hydrographic barriers on population genetic structure of the sea star Coscinasterias muricata (Echinodermata, Asteroidea) in the New Zealand fiords

Molecular Ecology
Cecile PerrinM S Roy

Abstract

New Zealand's 14 deep-water fiords possess persistent salinity stratification and mean estuarine circulation that may serve to isolate populations of marine organisms that have a dispersal larval phase. In order to investigate this idea, we analysed the population structure of the sea star Coscinasterias muricata using a mitochondrial DNA marker. Genetic differentiation among populations of C. muricata was analysed using 366 base pairs of mtDNA D-loop. We compared populations from the fiords with several others sampled from around New Zealand. At a macro-geographical scale (> 1000 km), restricted gene flow between the North and South Islands was observed. At a meso-geographical scale (10-200 km), significant population structure was found among fiords and between fiords and open coast. The pattern of population genetic structure among the fiords suggests a secondary contact between a northern population and a southern one, separated by a contact or mixing zone. These populations may have diverged by the effects of random genetic drift and population isolation as a consequence of the influence of estuarine circulation on dispersal. In northern Fiordland, genetic structure approximated an isolation by distance model. However, the...Continue Reading

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Citations

Jan 30, 2013·Frontiers in Zoology·Sofie DeryckeTom Moens
Sep 30, 2015·Molecular Ecology·Catarina N S Silva, Jonathan P A Gardner
Aug 14, 2009·Molecular Ecology·Graham P Wallis, Steven A Trewick
Apr 14, 2006·Evolution; International Journal of Organic Evolution·David W KellyDaniel D Heath
Dec 9, 2017·Molecular Ecology·Alex Garcia-CisnerosRocío Pérez-Portela

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