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dc.contributor.authorPonniah, M
dc.contributor.authorHughes, JM
dc.contributor.editorDonald M Waller
dc.date.accessioned2017-05-03T11:06:50Z
dc.date.available2017-05-03T11:06:50Z
dc.date.issued2004
dc.date.modified2009-09-24T05:55:32Z
dc.identifier.issn0014-3820
dc.identifier.doi10.1554/03-416
dc.identifier.urihttp://hdl.handle.net/10072/5224
dc.description.abstractThe upland mesic rainforests of eastern Australia have been described as a "mesothermal archipelago" where a chain of cool mountain "islands" arise from a warm "sea" of tropical and subtropical lowlands. An endemic freshwater crayfish belonging to the genus Euastacus is found on each of these mountain "islands." The Euastacus are particularly suitable for the study of evolution because each mountain harbors a unique species, there are many taxa present providing replication within the group and, most importantly, their distribution is linear, extending along a south-north axis. This group could have evolved by "simultaneous vicariance" where there was one vicariant separation event of a widespread ancestor, or by "south to north stepping stone dispersal" where there were long distance dispersal events from neighboring mountain islands, starting in the south and proceeding north in a dispersal-colonization wave. We used pairwise genetic distances between nearest geographic neighbors as a novel way to test the two hypotheses. If diversification was due to "south to north stepping stone dispersal," then pairwise genetic distances between nearest geographic neighbors should decrease progressively the farther north the taxon pairs are found, reflecting the decreasing periods of isolation. In this case there should be a negative correlation between the south to north rank order of nearest neighbors and pairwise genetic distances. A Spearman's correlation on 16S mtDNA pairwise genetic distances and geographic rank order was not significant, indicating there was no support for the south to north stepping stone dispersal hypothesis. If simultaneous vicariance was responsible for diversification then all nearest geographic neighbor taxon pairs should have similar genetic distances and, therefore, the variance in nearest neighbor distances should be zero, or close to it. To test if the observed variance was tending towards zero we developed a randomization test where nearest neighbor taxon pairs were assigned random genetic distances and the variances calculated. The observed variance lay in the < 0.05 range of the simulated variances, providing support for the simultaneous vicariance hypothesis. The data also suggest there was simultaneous vicariance of at least two ancestral Queensland lineages. The timing of this vicariant event was probably in the Pliocene, which is consistent with the divergence times reported for other Australian mesic rainforest restricted taxa.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherSociety for the Study of Evolution
dc.publisher.placeLawrence, USA
dc.publisher.urihttp://www.bioone.org/loi/evol
dc.relation.ispartofpagefrom1073
dc.relation.ispartofpageto1085
dc.relation.ispartofedition2004
dc.relation.ispartofissue5
dc.relation.ispartofjournalEvolution
dc.relation.ispartofvolume58
dc.subject.fieldofresearchEcology
dc.subject.fieldofresearchEvolutionary biology
dc.subject.fieldofresearchcode3103
dc.subject.fieldofresearchcode3104
dc.titleThe Evolution of Queensland Spiny Mountain Crayfish of the Genus Euastacus. I. Testing Vicariance and Dispersal with Interspecific Mitochondrial DNA
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.date.issued2004
gro.hasfulltextNo Full Text
gro.griffith.authorHughes, Jane M.
gro.griffith.authorPonniah, Mark H.


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