Positive association between social and extra-pair mating in a polygynous songbird, the dickcissel (Spiza americana)
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In polygynous species, males appear to gain additional offspring by pairing with multiple females simultaneously. However, this may not be true if some females copulate outside of the social pair bond. Polygynous males could experience lower paternity because of trade-offs among gaining multiple social mates, guarding fertility with these mates, and pursuing extra-pair matings. Alternatively, polygynous males could simultaneously gain extra social mates and have high paternity, either because of female preferences or because of male competitive attributes. We tested four predictions stemming from these hypotheses in a facultatively polygynous songbird, the dickcissel (Spiza americana). Unlike most previous studies, we found that males with higher social mating success (harem size) also tended to have higher within-pair paternity and that the number of extra-pair young a male sired increased significantly with his social mating success. Females that paired with mated males were not more likely to produce extra-pair young. In contrast, extra-pair paternity was significantly lower in the nests of females whose nesting activity overlapped that of another female on the same territory. This pattern of mating was robust to differences in breeding density. Indeed, breeding density had no effect on either extra-pair mating or on the association between polygyny and paternity. Finally, nest survival increased with harem size. This result, combined with the positive association between polygyny and paternity, contributed to significantly higher realized reproductive success by polygynous male dickcissels.
KeywordsMating patterns Polygyny Extra-pair paternity Trade offs Female choice Density
We thank the University of California at Berkeley’s Museum of Vertebrate Zoology for use of laboratory facilities for paternity analysis and Wayne Li, Lauren Scopel, and Dr. Sheila Byrne for help in the field. We appreciate the helpful comments on the MS from A. Pilastro, J. Lifjeld, and an anonymous reviewer. This study was supported by grants from the American Philosophical Society’s Lewis and Clark Fund for Field Research and The Gertrude Ribble Fund from the U.K. Department of Biology. B. Sousa was supported by a graduate fellowship from the Graduate School of the University of Kentucky. Konza Prairie Biological Station is a preserve of The Nature Conservancy managed by the Division of Biology at Kansas State University.
The authors declare that all experiments comply with current US laws.
Conflict of interest
The authors declare that they have no conflict of interest.
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