The common cuckoo Cuculus canorus is divided into host-specific races (gentes)1. Females of each race lay a distinctive egg type that tends to match the host's eggs, for instance, brown and spotted for meadow pipit hosts or plain blue for redstart hosts2,3,4. The puzzle is how these gentes remain distinct. Here, we provide genetic evidence that gentes are restricted to female lineages, with cross mating by males maintaining the common cuckoo genetically as one species. We show that there is differentiation between gentes in maternally inherited mitochondrial DNA, but not in microsatellite loci of nuclear DNA. This supports recent behavioural evidence that female, but not male, common cuckoos specialize on a particular host5, and is consistent with the possibility that genes affecting cuckoo egg type are located on the female-specific W sex chromosome6. Our results also support the ideas that common cuckoos often switched hosts during evolution7,8, and that some gentes may have multiple, independent origins, due to colonization by separate ancestral lineages.
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We thank L. De Sousa, L. M. Tabak and M. Ramon for help in the lab, and A. Baker, P. Fu, B. Golding, A. Lotem, R. A. Morton, R. B. Payne, T. D. Price and E. Røskaft for discussion and comments. Funded by grants from NSERC (Canada) (H.L.G.), Boston University (M.D.S.), SERC (UK) and NERC (UK) (N.B.D.), and a NATO Postdoctoral Fellowship (K.M.) H.L.G. thanks S. I. Rothstein for initiating part of this collaboration by introducing him to H.N.
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Gibbs, H., Sorenson, M., Marchetti, K. et al. Genetic evidence for female host-specific races of the common cuckoo . Nature 407, 183–186 (2000). https://doi.org/10.1038/35025058
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