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Historic divergence with contemporary connectivity in a catadromous fish, the estuary perch (Macquaria colonorum)


Shaddick, K and Gilligan, DM and Burridge, CP and Jerry, DR and Truong, K and Beheregaray, LB, Historic divergence with contemporary connectivity in a catadromous fish, the estuary perch (Macquaria colonorum) , Canadian Journal of Fisheries and Aquatic Sciences, 68, (2) pp. 304-318. ISSN 0706-652X (2011) [Refereed Article]

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Copyright 2011 Canadian Science Publishing

DOI: doi:10.1139/F10-139


The estuary perch (Macquaria colonorum) represents an important model for assessing how historical changes in coastal geomorphology and current oceanographic and estuarine conditions may have impacted connectivity in a cata- dromous fish. A fragment of the mitochondrial control region and six microsatellite DNA markers were used to clarify connectivity in 17 populations (n = 354) of estuary perch from the southeast and southern coasts of Australia. The mtDNA data showed a latitudinal disjunction in haplotype frequencies that divided populations into two groups (FST = 0.419), in a pattern suggestive of isolation by geographic distance. However, no marked structure or correlation with distance was ap- parent within each group, a result consistent with microsatellite data that showed high contemporary population connectiv- ity across large distances. This was contrary to expectations that the species would exhibit moderate to strong genetic structure consistent with a one-dimensional stepping stone pattern. Coalescent phylogeographic and population genetic analyses provided support for a historical divergence probably due to the emergence of the Bassian Isthmus in southern Australia. Current connectivity appears to be maintained by both large- and fine-scale oceanographic currents and proc- esses, highlighting the important role of the marine environment for an estuarine resident species.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Genetics not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:Burridge, CP (Associate Professor Christopher Burridge)
ID Code:67458
Year Published:2011
Web of Science® Times Cited:22
Deposited By:Zoology
Deposited On:2011-03-03
Last Modified:2017-10-31
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