Genetic diversity of Rhagada land snails on Barrow Island

The dominant group of land snails in the Pilbara Region is the camaenid genus Rhagada, which includes several species confined to islands. Analysis of allozymes confirmed the presence of two genetically distinct species of Rhagada on Barrow Island: a small species restricted to the northern tip of t...

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Veröffentlicht in:Journal of the Royal Society of Western Australia 2006-06, Vol.89, p.45-45
Hauptverfasser: Johnson, Michael S, Hamilton, Zoë R, Fitzpatrick, Jeremy
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Sprache:eng
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Zusammenfassung:The dominant group of land snails in the Pilbara Region is the camaenid genus Rhagada, which includes several species confined to islands. Analysis of allozymes confirmed the presence of two genetically distinct species of Rhagada on Barrow Island: a small species restricted to the northern tip of the island, and a large species widespread over the remainder of the island. Comparisons amongst 19 samples of the widespread, large species revealed distinct populations, but with unusually low levels of genetic subdivision, and no detectable geographic pattern on the island. In contrast with the low divergence within species, the two species are genetically the most distinctive of all species of Rhagada examined from the Pilbara Region. The genetic distinctiveness of these species highlights the conservation value of Barrow Island for these endemic snails, and raises questions of the evolutionary history of Rhagada in the Pilbara Region.
ISSN:0035-922X