Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/117061
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Type: Journal article
Title: Historical processes and contemporary ocean currents drive genetic structure in the seagrass Thalassia hemprichii in the Indo-Australian Archipelago
Author: Hernawan, U.
van Dijk, K.
Kendrick, G.
Feng, M.
Biffin, E.
Lavery, P.
McMahon, K.
Citation: Molecular Ecology, 2017; 26(4):1008-1021
Publisher: Wiley
Issue Date: 2017
ISSN: 0962-1083
1365-294X
Statement of
Responsibility: 
Udhi E. Hernawan, Kor-jent van Dijk, Gary A. Kendrick, Ming Feng, Edward Biffin, Paul S. Lavery and Kathryn McMahon
Abstract: Understanding spatial patterns of gene flow and genetic structure is essential for the conservation of marine ecosystems. Contemporary ocean currents and historical isolation due to Pleistocene sea level fluctuations have been predicted to influence the genetic structure in marine populations. In the Indo-Australian Archipelago (IAA), the world's hotspot of marine biodiversity, seagrasses are a vital component but population genetic information is very limited. Here, we reconstructed the phylogeography of the seagrass Thalassia hemprichii in the IAA based on single nucleotide polymorphisms (SNPs) and then characterized the genetic structure based on a panel of 16 microsatellite markers. We further examined the relative importance of historical isolation and contemporary ocean currents in driving the patterns of genetic structure. Results from SNPs revealed three population groups: eastern Indonesia, western Indonesia (Sunda Shelf) and Indian Ocean; while the microsatellites supported five population groups (eastern Indonesia, Sunda Shelf, Lesser Sunda, Western Australia and Indian Ocean). Both SNPs and microsatellites showed asymmetrical gene flow among population groups with a trend of southwestward migration from eastern Indonesia. Genetic diversity was generally higher in eastern Indonesia and decreased southwestward. The pattern of genetic structure and connectivity is attributed partly to the Pleistocene sea level fluctuations modified to a smaller level by contemporary ocean currents.
Keywords: Gene flow; geological history; microsatellite; ocean current; single nucleotide polymorphisms
Rights: © 2016 John Wiley & Sons Ltd
RMID: 0030065114
DOI: 10.1111/mec.13966
Appears in Collections:Earth and Environmental Sciences publications

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