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Science 20 June 2003:
Vol. 300. no. 5627, p. 1844
DOI: 10.1126/science.300.5627.1844h
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This Week in Science
In most species with cooperative breeding, helpers are offspring that remain on the natal territory. Is the resultant kin favoritism the result of deliberate kin selection by individuals or some other effect, such as not leaving the neighborhood? Two reports present experimental results addressing this issue (see the Perspective by Dickinson and Koenig). Sinervo and Clobert (p. 1949) describe detailed genetic evidence for the existence of cooperation between unrelated male lizards that share both a high degree of genetic similarity but, more importantly, a similar throat color allele. The authors present evidence of the adaptive value of such male-male associations. Baglione et al. (p. 1947), in a study with carrion crows, using DNA microsatellites, found that immigrants and resident breeders of the same sex are highly genetically related and that crows actively chose to associate with relatives. Cooperation between relatives is more common in this case than expected and cannot be explained by limited dispersal.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
