Genetic variability and the ecology of geographic range: A test of the central-marginal hypothesis in Australian scincid lizards.

Abstract excerpt

For many species, both local abundance and regional occupancy are highest near the centre of their geographic distributions. One hypothesis for this pattern is that niche suitability declines with increasing distance from a species geographic centre, such that populations near range margins are characterized by reduced density and increased patchiness. In these smaller edge populations, genetic drift is more...

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