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1 March 2011 Interbreeding of Aechmophorus grebes
André Konter
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I analyzed the occurrence of intermediates between Western (Aechmophorus occidentalis) and Clark's (A. clarkii) grebes, of mixed pairings, and of species composition in populations of Aechmophorus grebes in California and Oregon, USA. Western Grebes comprised 69% of the aggregated total of grebes identified while intermediates represented ~3.5% (41–46 individuals) in the populations investigated. I conclude that numbers of intermediates between purebred parental individuals have increased. Higher percentages of mixed pairings were observed at Lake Almanor; an aggregated 7.9% of nesting pairs were not composed of two purebred grebes of the same species. Statistically, mating remained strongly assortative.

André Konter "Interbreeding of Aechmophorus grebes," The Wilson Journal of Ornithology 123(1), 132-136, (1 March 2011).
Received: 1 June 2010; Accepted: 1 September 2010; Published: 1 March 2011
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