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FERRETTI Valentina

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Título:

Comparison of sexual characters in two sister species of the genus Tachycineta that differ markedly in their mating system

Autor/es:

LOPEZ, ALDANA S.; FERRETTI, VALENTINA

Lugar:

Washington D.C.

Reunión:

Congreso; North American Ornithological Congress; 2016

Institución organizadora:

Ornithological Societies of North America

Resumen:

Sexual selection can favor the competitive ability of theindividuals of one sex to fertilize individuals of the other sex (e.g.,increased gonadal size and production of sperm cells, increased body size), orit can favor the development of characters in individuals of one sex that areattractive to the other sex (e.g., nuptial plumage, ornaments). Usually, theintensity of sexual selection is reflected on the reproductive behavior ofindividuals, resulting in different mating systems. In birds, extra-pairmatings occur in the majority of species, leading to intense sperm competition,and the evolution of mechanisms of sexual selection. The objective of this workis to compare gonadal volume in males and intersexual differences in sizewithin the context of the theory of sexual selection in two sister species inthe genus Tachycineta, T. meyeni and T. leucorrhoa, that show substantial variation in extra-pairpaternity as a result of extra-pair matings (13% and 61-78% of nests have mixedpaternity, respectively). We collected data on testes and body size from museumvoucher specimens. The two species differed in size but we did not findsignificant differences in size between males and females for any of the twospecies studied. We failed to find differences in testes volume between specieseven after correcting by size. We did not find the expected relationshipbetween intensity of sexual selection, and testes volume and body size. We hopethis study will contribute to a better understanding of when and howevolutionary change in reproductive characters occurs.

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