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Science 7 December 1990:
Vol. 250. no. 4986, pp. 1394 - 1397
DOI: 10.1126/science.250.4986.1394

Articles

Realized Reproductive Success of Polygynous Red-Winged Blackbirds Revealed by DNA Markers

H. Lisle Gibbs 1, Patrick J. Weatherhead 2, Peter T. Boag 1, Bradley N. White 1, Lisa M. Tabak 1, and Drew J. Hoysak 2

1 Department of Biology, Queen's University, Kingston, Ontario, Canada K7L 3N6
2 Department of Biology, Carleton University, Ottawa, Ontario, Canada K1S 5B6

Hypervariable genetic markers, including a novel locus-specific marker detected by a mouse major histocompatibility complex probe, reveal that multiple paternity is common in families of polygynous red-winged blackbirds (Agelaius phoeniceus). Almost half of all nests contained at least one chick resulting from an extra-pair fertilization, usually by a neighboring male. Genetically based measures of reproductive success show that individual males realize more than 20% of their overall success from extra-pair fertilizations, on average, and that this form of mating behavior confounds traditional measures of male success. The importance of alternative reproductive tactics in a polygynous bird is quantified, and the results challenge previous explanations for the evolution of avian polygny.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)