Winter color polymorphisms identify global hot spots for evolutionary rescue from climate change

TitleWinter color polymorphisms identify global hot spots for evolutionary rescue from climate change
Publication TypeJournal Article
Year of Publication2018
AuthorsL. Mills, Scott, Bragina Eugenia V., Kumar Alexander V., Zimova Marketa, Lafferty Diana J. R., Feltner Jennifer, Davis Brandon M., Hackländer Klaus, Alves Paulo C., Good Jeffrey M., Melo-Ferreira José, Dietz Andreas, Abramov Alexei V., Lopatina Natalia, and Fay Kairsten
Pagination1033 - 1036
Date PublishedFeb-03-2018
Keywordsclimate change, evolution, hot spots, polymorphic zones

Maintenance of biodiversity in a rapidly changing climate will depend on the efficacy of evolutionary rescue, whereby population declines due to abrupt environmental change are reversed by shifts in genetically driven adaptive traits. However, a lack of traits known to be under direct selection by anthropogenic climate change has limited the incorporation of evolutionary processes into global conservation efforts. In 21 vertebrate species, some individuals undergo a seasonal color molt from summer brown to winter white as camouflage against snow, while other individuals remain brown. Seasonal snow duration is decreasing globally, and fitness is lower for winter white animals on snowless backgrounds. Based on 2713 georeferenced samples of known winter coat color—from eight species across trophic levels—we identify environmentally driven clinal gradients in winter coat color, including polymorphic zones where winter brown and white morphs co-occur. These polymorphic zones, underrepresented by existing global protected area networks, indicate hot spots for evolutionary rescue in a changing climate.

Short TitleScience