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Podicipedidae (1 Viewer)

Peter Kovalik

Well-known member
Slovakia
André Konter, 2020. The history of the grebes Podicipedidae in ornithology: Names, illustrations, systematic position and scientific progress – Insights into ornithological progress by the example of the grebes and the development of their phylogenetic relationships. Ferrantia 82, Musée national d’histoire naturelle, Luxembourg, 592 p.

[abstract]
 
This huuuuuuuuuuuuge monograph lacks a very important thing, a complete phylogeny of Grebe.
We can perhaps envisage, suppose, that a vast study is in progress. It would be really interesting because apart from Ogawa's work, there is nothing else
 
Hayes, F.E., B.J. McIntosh, D.G. Turner, and D.E. Weidemann (2024) Mate choice and hybridization in the Western Grebe and Clark's Grebe: tests of the scarcity of mates and sexual selection hypotheses. Western North American Naturalist 84: 335-341.
Mate Choice and Hybridization in the Western Grebe and Clark's Grebe: Tests of the Scarcity of Mates and Sexual Selection Hypotheses

Abstract
Hybridization is predicted to occur most frequently in closely related species when one species is rare (scarcity of mates hypothesis) and when the rare species of a heterospecific pair is more likely to be female (sexual selection hypothesis). We studied hybridization in mixed breeding colonies of the Western Grebe (Aechmophorus occidentalis) and Clark's Grebe (A. clarkii) at Clear Lake, California, during 2011–2019. Of 203 mated pairs with at least one Clark's Grebe (the rarer species, attending 15% of nests), 77.3% were conspecific pairs, 20.7% were heterospecific pairs, and 2.0% comprised a Clark's Grebe paired with a presumed hybrid. The proportion of heterospecific pairs was no greater in smaller colonies or later during the breeding season, contradicting the scarcity of mates hypothesis. Of 42 heterospecific pairs, the Clark's Grebe was just as likely to be male (45.2%) as female (54.8%), contradicting the sexual selection hypothesis. Hybridization between these species more likely results from an error in sexual imprinting due to interspecific brood parasitism or from extrapair copulations.
 

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