Within-drainage population genetic structure of the freshwater fish Pseudomugil signifer (Pseudomugilidae) in norther. Australia

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Title Within-drainage population genetic structure of the freshwater fish Pseudomugil signifer (Pseudomugilidae) in norther. Australia
Author McGlashan, Dugald; Hughes, Jane; Bunn, Stuart
Journal Name Canadian Journal of Fisheries and Aquatic Sciences
Year Published 2001
Place of publication Canada
Publisher NRC Research Press
Abstract Dendritic channel patterns have the potential to isolate populations within drainages, depending on the relative position within the stream hierarchy of the populations. We investigated the extent of genetic subdivision in the Australian freshwater fish Pseudomugil signifer (Kner) (Pseudomugilidae) from two drainages in northern Queensland, Australia, using allozyme techniques. The drainages were adjacent and had similar channel patterns each with two major subcatchments coalesced to an estuarine confluence. Analysis of 30 sites across the two drainages revealed that although there was significant genetic variation among sites in both drainages, this was not between the two subcatchments in either case. This result did not support predictions of the stream hierarchy model (SHM), which would predict higher levels of variation among subcatchments than within them, nor did it suggest that estuarine conditions represent a significant barrier to dispersal in this species. More variation was among sites within each subcatchment. Multidimensional scaling plots revealed that, although most sites within a drainage were similar to one another, outlier sites occurred in each drainage, so correlations between genetic distance and geographic distance were weak. We suggest that the distance between sites and the probability of connectivity between sites may better explain the observed distribution of genetic diversity.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1139/f01-113
Copyright Statement Copyright2001 NRC Research Press. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 58
Page from 1842
Page to 1852
ISSN 0706-652X
Date Accessioned 2002-04-17
Date Available 2015-05-11T05:35:59Z
Language en_US
Research Centre Australian Rivers Institute
Subject PRE2009-Freshwater Ecology
URI http://hdl.handle.net/10072/3709
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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