Function and underlying mechanisms of seasonal colour moulting in mammals and birds: what keeps them changing in a warming world?

• Type: Article in International Scientific Journal
• Date: 2018-03-05

Authors

Marketa Zimova (Author) Other; Klaus Hackländer (Author) Other; Jeffrey M. Good (Author) Other; José Melo-Ferreira (Author) FCUP; Paulo C. Alves (Author) FCUP; L. Scott Mills (Author) Other

Journal

Title: Biological Reviews

Vol. 93

Pages: 1478-1498

ISSN: 1464-7931

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 99 Citations

Scopus - 112 Citations

Other information

Authenticus ID: P-00P-03T

DOI: 10.1111/brv.12405

Abstract (EN): Animals that occupy temperate and polar regions have specialized traits that help them survive in harsh, highly seasonal environments. One particularly important adaptation is seasonal coat colour (SCC) moulting. Over 20 species of birds and mammals distributed across the northern hemisphere undergo complete, biannual colour change from brown in the summer to completely white in the winter. But as climate change decreases duration of snow cover, seasonally winter white species (including the snowshoe hare Lepus americanus, Arctic fox Vulpes lagopus and willow ptarmigan Lagopus lagopus) become highly contrasted against dark snowless backgrounds. The negative consequences of camouflage mismatch and adaptive potential is of high interest for conservation. Here we provide the first comprehensive review across birds and mammals of the adaptive value and mechanisms underpinning SCC moulting. We found that across species, the main function of SCC moults is seasonal camouflage against snow, and photoperiod is the main driver of the moult phenology. Next, although many underlying mechanisms remain unclear, mammalian species share similarities in some aspects of hair growth, neuroendocrine control, and the effects of intrinsic and extrinsic factors on moult phenology. The underlying basis of SCC moults in birds is less understood and differs from mammals in several aspects. Lastly, our synthesis suggests that due to limited plasticity in SCC moulting, evolutionary adaptation will be necessary to mediate future camouflage mismatch and a detailed understanding of the SCC moulting will be needed to manage populations effectively under climate change.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 21