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Emergence of black-colored wolves is the direct result of humans raising dogs as pets and beasts of burden, according to new. And dark coloring may also aid the survival of the species as wolf habitat is affected by climate change in the future.Using genetic analysis of gray wolf populations from North America and Europe, the researchers traced the source of the dominant gene responsible for dark coat color in wolves to domesticated dogs and conclude the trait was passed to the gray wolf population, as well as to coyotes, by mating between the closely-related wild and domestic canid species. The transition could have taken place as recently as the arrival of European domestic dogs in North America or as long as 14,000 years ago when humans migrated into North America across the Bering Strait.
Since then, black fur has become commonplace in wolf packs, perhaps because snow-covered northern environments are shrinking and darker coloring allows for greater stealth while hunting in areas without snow. While gray wolves can be found in colors ranging from white to gray to black, light-coloration is predominantly found in the arctic tundra where wolves prey on barren ground caribou. The researchers note that the relationship between coat color and habitat is often attributed to adaptation and natural selection, but this is the first example of a genetic modification that likely arose due to human selection becoming adaptive and selected for when back in nature.
"Although it happened by accident, black wolves are the first example of wolves being genetically-engineered by people," said Marco Musiani. "Domestication of dogs has led to dark-colored coats in wolves, which has proven to be a valuable trait for wolf populations as their arctic habitat shrinks," Musiani said. "It also shows that human activities can help enrich the genetic diversity of wild animal populations, which is a very unexpected finding."
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Ref: Molecular and Evolutionary History of Melanism in North American Gray Wolves. 2009. T. M. Anderson, et al. Science 323: Published Online February 5, 2009.