Abstract
Females of many songbird species show a preference for mating with males that have larger song repertoires, but the advantages associated with this preference are uncertain. We tested the hypothesis that song complexity can serve as an indicator of male quality because the development of the brain regions underlying song learning and production occurs when young birds typically face nutritional and other stresses, so that song reflects how well a male fared during post-hatch development. A key prediction of this hypothesis is that variation in nestling condition should correspond to variation in the adult song repertoires of individuals. We used data from a long-term study of the great reed warbler (Acrocephalus arundinaceus) to test this prediction, correlating two measures of nestling development with subsequent repertoire size of males. We found that the length of the innermost primary feather, a standard measure of development, significantly predicted first-year repertoire size. The relationship between repertoire size and body mass was nearly significant, in spite of the large variance inherent in this measure. These data support the idea that song may provide females with information about a male's response to developmental stress, which in turn is expected to correlate with indirect or direct benefits she might receive.
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Selected References
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- Buchanan K. L., Catchpole C. K. Song as an indicator of male parental effort in the sedge warbler. Proc Biol Sci. 2000 Feb 22;267(1441):321–326. doi: 10.1098/rspb.2000.1003. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Buchanan KL, Catchpole CK, Lewis JW, Lodge A. Song as an indicator of parasitism in the sedge warbler. Anim Behav. 1999 Feb;57(2):307–314. doi: 10.1006/anbe.1998.0969. [DOI] [PubMed] [Google Scholar]
- Buchanan KL. Stress and the evolution of condition-dependent signals. Trends Ecol Evol. 2000 Apr;15(4):156–160. doi: 10.1016/s0169-5347(99)01812-1. [DOI] [PubMed] [Google Scholar]
- Grafen A. Biological signals as handicaps. J Theor Biol. 1990 Jun 21;144(4):517–546. doi: 10.1016/s0022-5193(05)80088-8. [DOI] [PubMed] [Google Scholar]
- Grafen A. Sexual selection unhandicapped by the Fisher process. J Theor Biol. 1990 Jun 21;144(4):473–516. doi: 10.1016/s0022-5193(05)80087-6. [DOI] [PubMed] [Google Scholar]
- Møller A. P., Henry P. Y., Erritzøe J. The evolution of song repertoires and immune defence in birds. Proc Biol Sci. 2000 Jan 22;267(1439):165–169. doi: 10.1098/rspb.2000.0982. [DOI] [PMC free article] [PubMed] [Google Scholar]
- doi: 10.1098/rspb.1998.0400. [DOI] [PMC free article] [Google Scholar]
- Zahavi A. Mate selection-a selection for a handicap. J Theor Biol. 1975 Sep;53(1):205–214. doi: 10.1016/0022-5193(75)90111-3. [DOI] [PubMed] [Google Scholar]
- von Schantz T., Bensch S., Grahn M., Hasselquist D., Wittzell H. Good genes, oxidative stress and condition-dependent sexual signals. Proc Biol Sci. 1999 Jan 7;266(1414):1–12. doi: 10.1098/rspb.1999.0597. [DOI] [PMC free article] [PubMed] [Google Scholar]