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A hybrid zone defined by allozymes and ventral colour in Geocrinia rosea (Anura:Myobatrachidae)

journal contribution
posted on 2007-12-01, 00:00 authored by Don DriscollDon Driscoll, J D Roberts
The frog Geocrinia rosea is highly genetically subdivided with a major genetic division between northern and southern populations. Previous research did not sample a region spanning 12 km between these two populations. We report the distribution of G. rosea in the unsampled area and identify a geographically restricted hybrid zone. Boundaries of genetic groups were defined using two allozyme loci in 13 populations and ventral colouration. G. rosea was not continuously distributed in the area of parapatry. At the only point where the northern and southern groups met, there was a single hybrid population with genotypes demonstrating substantial interbreeding. Colour patterns implied a slightly broader hybrid zone, with four populations showing ventral colour introgression. Northern populations tended to have pink bellies whereas southern populations generally had orange bellies. We conclude that the two groups have diverged in allopatry and have formed a very narrow hybrid zone after range expansion. The magnitude of allozyme divergence between the four currently recognised species in the G. rosea complex is similar to the divergence between northern and southern G. rosea and is much greater than the divergence between other intraspecific groups. Taxonomic revision may therefore be warranted.



Australian Journal of Zoology






371 - 376


C S I R O Publishing


Clayton, Vic.





Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2007, C S I R O