Global warming shifts range of showshoe hares

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A snowshoe hare. Photo courtesy Kim Fenske.

Reduced snowcover driving species northward

Staff Report

Reduced snow cover driven by global warming is squeezing snowshoe hares out of some parts of the species’ historic range, according to researchers with the University of Madison-Wisconsin. According to the study, the range of the hare in Wisconsin is creeping north by about five and a half miles per decade, closely tracking the diminishing snow cover the animal requires to be successful.

“The snowshoe hare is perfectly modeled for life on snow,” saud Jonathan Pauli, a UW-Madison professor of forest and wildlife ecology and one of the co-authors of the new study, published in Proceedings of the Royal Society B. “They’re adapted to glide on top of the snow and to blend in with the historical colors of the landscape.”

Northern winters have become shorter and milder in the global warming era. The seasonal blanket of snow that many species depend on is in steady retreat, becoming thinner and less dependable in regions that once experienced snow well into the spring months.

The Wisconsin study is important because it helps illustrate the effects of climate change on a sentinel species for northern ecosystems, showing how the composition of plants and animals on the landscape is gradually shifting in a warming world. The findings also signal that climate change is beginning to eclipse land use as the dominant driver of ecological change.

“This is one of the first studies to really identify how changing climate factors influence a southern range boundary,” said Ben Zuckerberg, a UW-Madison professor of forest and wildlife ecology and a co-author of the study.

In Wisconsin, a legacy of research on snowshoe hares dates to at least 1945, when famed ecologist Aldo Leopold published some of the first anecdotal data, recording their presence in an arcing trajectory covering roughly half of the state from the Mississippi north of St. Paul to Green Bay. Studies of the hare and its range were continued and expanded by UW-Madison wildlife ecologist Lloyd B. Keith beginning in the 1960s.

The new study, which was led by UW-Madison graduate student Sean M. Sultaire, drew on observations at 148 of 249 historic survey sites where snowshoe hares were documented in the past. Of 126 sites where hares were once reported, the animal was found at only 28. The researchers were unable to document hares at the remaining 98 sites, or 78 percent of the places where hares were once found.

Lack of snow, of course, can pose serious problems for an animal that depends on its coloring to blend into its environment and avoid predation. “Color mismatch — white fur on a brown background — will continue to occur and have a significant impact” on the species, according to Pauli. “For a snowshoe hare, being cryptic is a fundamental requirement for making a living. It is a relatively fixed phenotype, so it is pretty clear that snow cover is one of the most important constraints in terms of where the animal can and can’t be.”

“Our winter climate has changed significantly over time,” said Zuckerberg, who, with Pauli, set out to document how a warmer world is affecting the ecological underpinnings of winter landscapes that were once awash in snow.

According to Pauli, the snowshoe hare at the southern range of its boundary must cope not only with less snow, but also with a steady northward march of carnivores like coyotes. “They’re getting pinched at both ends.”

The ecological consequences of diminished abundance of snowshoe hare will be significant, having both ecological and economic consequences as the animal is both an important game species in Wisconsin and a menu item for many other species of animals and raptors.

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