Sexual selection and the tail ornaments of North American barn swallows (original) (raw)
Summary
In this study conducted in southeastern Ontario, Canada, we manipulated the length of outer tail feathers (streamers) of male barn swallows (Hirundo rustica) shortly after they returned to four small breeding colonies in the spring. Both streamers on most males in these colonies were experimentally either lengthened or shortened by 20 mm and as a result 10 randomly chosen males of each category had their streamer lengths manipulated before the fertile period of their mate. Males with elongated streamers had a significantly shorter pre-laying period (from arrival until first egg date) than those with shortened streamers and we interpret this as indicating that they obtained their mates more rapidly. Females mated to elongated males had significantly longer tails and laid their first egg significantly earlier than those mated to shortened males; no other indices of reproductive success differed between these two experimental groups. These results provide some support for previous work suggesting that females prefer males with longer streamers and thus that streamer length in this species is under the influence of sexual selection. We also found that males with longer natural streamers were significantly more likely to break them and that males were much more likely to break their streamers than were females. Since males participate in incubation in North America but not in Europe, we suggest that the aerodynamic disadvantages of streamer breakage that result from incubation attentiveness are at least partly responsible for the shorter streamer length of males in North America.
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- Henrik G. Smith
Present address: Ecology Building, Helgonavägen 5, S-223 62, Lund, Sweden
Authors and Affiliations
- Department of Biology, Queen's University, K7L 3N6, Kingston, Ont, Canada
Henrik G. Smith & Robert Montgomerie
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- Henrik G. Smith
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Smith, H.G., Montgomerie, R. Sexual selection and the tail ornaments of North American barn swallows.Behav Ecol Sociobiol 28, 195–201 (1991). https://doi.org/10.1007/BF00172171
- Received: 08 December 1989
- Accepted: 30 August 1990
- Issue Date: March 1991
- DOI: https://doi.org/10.1007/BF00172171