The genetic basis and enigmatic origin of melanic polymorphism in pomarine skuas (Stercorarius pomarinus)
| Autor: | Nicholas I. Mundy, Kirstin Janssen |
|---|---|
| Přispěvatelé: | Mundy, Nicholas I [0000-0002-5545-1517], Apollo - University of Cambridge Repository |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
0301 basic medicine plumage colour Evolution Introgression Biology 010603 evolutionary biology 01 natural sciences Skua Corrections General Biochemistry Genetics and Molecular Biology polymorphism Evolution Molecular 03 medical and health sciences Charadriiformes Convergent evolution MC1R melanism VDP::Mathematics and natural science: 400::Zoology and botany: 480 Animals Phylogeny General Environmental Science Polymorphism Genetic General Immunology and Microbiology Pigmentation Melanism Haplotype Pomarine skua General Medicine skua Feathers biology.organism_classification Great skua jaeger 030104 developmental biology Haplotypes Plumage Evolutionary biology General Agricultural and Biological Sciences VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 |
| Popis: | A key outstanding issue in adaptive evolution is the relationship between the genetics of intraspecific polymorphism and interspecific evolution. Here, we show that the pale/dark ventral plumage polymorphism that occurs in both the pomarine skua ( Stercorarius pomarinus ) and Arctic skua ( S. parasiticus ) is the result of convergent evolution at the same locus ( MC1R ), involving some of the same amino acid sites. The dark melanic MC1R allele in the pomarine skua is strongly divergent from the pale MC1R alleles. Whereas the dark allele is closely related to MC1R alleles in three species of great skua ( S. skua , S. maccormicki , S. lonnbergi ), the pale pomarine skua MC1R alleles present a star-like pattern in an intermediate position on the haplotype network, closer to alleles of the long-tailed skua ( S. longicaudus ). Variation at other nuclear loci confirms a close relationship between the pomarine skua and the great skuas. The plumage polymorphism in pomarine skuas might have arisen in the common ancestor of pomarine and great skuas, only being retained in pomarine skuas. Alternatively, the pale and melanic MC1R alleles may have evolved independently in different lineages and been brought together in pomarine skuas by hybridization. In this case, introgression of a pale MC1R allele into the pomarine skua from another skua lineage is most likely. Our current data do not permit us to distinguish between these hypotheses, and assaying genome-wide variation holds much promise in this regard. Nevertheless, we have uncovered an intriguing example of a functionally important allele within one species that is shared across species. |
| Databáze: | OpenAIRE |
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