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13 March 2017 The dark side of birds: melanism—facts and fiction
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Melanism is generally defined as an increase of dark pigment in the plumage, resulting in a blackish appearance. Furthermore, melanism is often associated with mutations of one gene that encodes the melanocortin 1 receptor (MC1R), a protein involved in regulating melanin pigmentation. However, there is often no increase of pigment and melanism does not necessarily involve dark pigment alone. Also, many different mutations in many different genes promote melanism, which may explain why it is the commonest colour morph in birds. In the past, melanistic birds were sometimes mistakenly named as new species. Ironically, it now appears that melanistic birds do indeed differ from their normalcoloured conspecifics in more than just colour.

© 2017 The Authors; Journal compilation © 2017 British Ornithologists' Club
Hein van Grouw "The dark side of birds: melanism—facts and fiction," Bulletin of the British Ornithologists’ Club 137(1), 12-36, (13 March 2017).
Received: 18 August 2016; Published: 13 March 2017

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