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dc.contributor.authorHughes, Janeen_US
dc.date.accessioned2017-05-03T11:06:56Z
dc.date.available2017-05-03T11:06:56Z
dc.date.issued2002en_US
dc.date.modified2009-09-24T05:52:15Z
dc.identifier.issn13231650en_US
dc.identifier.doi10.1071/MF01107en_AU
dc.identifier.urihttp://hdl.handle.net/10072/6743
dc.description.abstractThe 'island' nature of river systems limits the possibility of dispersal in freshwater fish species, with many displaying extensive genetic subdivision across their ranges. We examined the population genetic structure of the predominantly freshwater fish, Pseudomugil signifer, at fine, medium and broad scales using allozyme and mitochondrial DNA techniques. Extensive genetic subdivision across the range (FST = 0.6) at six polymorphic allozyme loci was partitioned mostly among river-system drainages (42%). Patterns of mitochondrial DNA sequences, which mirrored previous taxonomic designations and a terrestrial biogeographic barrier, identified two major groups. The level of divergence between the groups implied a considerable period of isolation. At a more localized scale, significant genetic differences between adjacent drainages implied that flood events are not effective transport mechanisms and indicate that populations of P. signifer in different drainages are essentially independent units. The history of P. signifer appears to be dominated, at different spatial scales, by long periods of isolation among drainages mediated by changes in sea-level, which merge and isolate drainages haphazardly over time. The chance nature of dispersal, coupled with isolation and potential population size fluctuations, probably leads to the observed complex patterns of genetic divergence.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherCSIROen_US
dc.publisher.placeAustraliaen_US
dc.publisher.urihttp://www.publish.csiro.au/nid/126.htmen_AU
dc.relation.ispartofpagefrom897en_US
dc.relation.ispartofpageto907en_US
dc.relation.ispartofjournalMarine and freshwater researchen_US
dc.relation.ispartofvolume53en_US
dc.subject.fieldofresearchcode270701en_US
dc.titleExtensive genetic divergence among populations of the Australian freshwater fish, Pseudomugil signifer (Pseudomugilidae), at different hierarchical scalesen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.facultyGriffith Sciences, Griffith School of Environmenten_US
gro.date.issued2002
gro.hasfulltextNo Full Text


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