Conserved Genetic Basis of a Quantitative Plumage Trait Involved in Mate Choice

Author:

Mundy Nicholas I.1234,Badcock Nichola S.1234,Hart Tom1234,Scribner Kim1234,Janssen Kirstin1234,Nadeau Nicola J.1234

Affiliation:

1. Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK.

2. Department of Biological Anthropology, University of Oxford, Oxford OX2 6QS, UK.

3. Department of Fisheries and Wildlife and Department of Zoology, Michigan State University, East Lansing, MI 48824, USA.

4. Department of Molecular Biotechnology, University of Tromsø, N-9037 Tromsø, Norway.

Abstract

A key question in evolutionary genetics is whether shared genetic mechanisms underlie the independent evolution of similar phenotypes across phylogenetically divergent lineages. Here we show that in two classic examples of melanic plumage polymorphisms in birds, lesser snow geese ( Anser c. caerulescens ) and arctic skuas ( Stercorarius parasiticus ), melanism is perfectly associated with variation in the melanocortin-1 receptor ( MC1R ) gene. In both species, the degree of melanism correlates with the number of copies of variant MC1R alleles. Phylogenetic reconstructions of variant MC1R alleles in geese and skuas show that melanism is a derived trait that evolved in the Pleistocene.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference32 articles.

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2. The Arctic Skua. A Study of the Ecology and Evolution of a Seabird 1983

3. Assortative mating in lesser snow geese (Anser caerulescens)

4. P. O'Donald, in Avian Genetics: A Population and Ecological Approach, F. Cooke, P. A. Buckley, Eds. (Academic Press, London, 1987), pp. 433–450.

5. Polymorphism, mating preferences and sexual selection in the Arctic skua

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