Aim To determine biogeographical patterns in five closely related species in the fish genus Hypseleotris, and to investigate the relative roles of drainage divide crossings and movement during lowered sea levels between drainage basins and biogeographical provinces based on the phylogeographical patterns within the group. The high degree of overlap in the distributions and ecology of these species makes them ideal candidates for comparative phylogeographical study.Location Eastern, central and south-eastern Australia.Methods A total of 179 Hypseleotris individuals were sequenced from 45 localities for the complete mitochondrial cytochrome b gene and the first 30 base pairs of the threonine transfer RNA for a total of 1170 bp. Phylogenetic relationships were hypothesized using parsimony and Bayesian analyses.
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