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Home NEWS Science News Biology

Rating riverside corridors — the 'escape routes' for animals under climate change

Bioengineer by Bioengineer
February 8, 2019
in Biology
Reading Time: 3 mins read
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Credit: Bureau of Land Management


Under climate change, plants and animals will shift their habitats to track the conditions they are adapted for. As they do, the lands surrounding rivers and streams offer natural migration routes that will take on a new importance as temperatures rise.

An open-access study led by the University of Washington pinpoints which riverside routes in Washington, Oregon, Idaho and western Montana will be the most important for animals trying to navigate a changing climate. The study was published this fall in PLOS ONE.

“This corridor network is already there, and it’s already important for animal movement,” said lead author Meade Krosby, a scientist in the UW’s Climate Impacts Group. “Under climate change these will become ‘superhighways’ for animals that are seeking new places to live. We’ve identified ones that could be priorities for conservation and restoration.”

Riparian areas — areas of habitat along the banks of rivers and streams — are known to be used by bears, coyotes, wolves, deer, mountain lions and other large mammals. But these regions could also benefit smaller mammals, like beavers and marmots, and even insects, birds and other species looking for cooler, moister terrain as conditions become less habitable.

“We aren’t the first to realize that riparian areas are likely to be really important for animals seeking refuge from warmer or drier conditions, or for connecting fragmented habitats under climate change,” Krosby said. “But we hadn’t seen anybody identify which riparian areas would be particularly valuable in the future.”

The authors developed a ranking system for riparian areas and applied it to the Northwest, creating a general technique that could be applied elsewhere. They rated the land surrounding rivers and streams for various features that would help animals on the move: width; amount of shade; tree cover; connection across temperature gradients; and general condition of the landscape.

Results show that the highest-quality routes in the Northwest are mostly in the mountains, which have shaded, well-protected riparian corridors that connect warmer to cooler habitats.

The authors then looked at which areas should be priorities for restoration — places that are not currently protected, or that offer the only natural pathway linking warmer and cooler landscapes. Here the routes through the Columbia Plateau, covering Eastern Washington, central Oregon and western Idaho, popped out as particularly important.

“If you look at an aerial photograph of an agricultural or urban landscape you’ll see these green corridors that follow streams and rivers,” Krosby said. “Humans use the flat areas of the landscape: we live there, we farm there, we use it for all kinds of things. So the riparian areas in these landscapes may not be in the best shape, but in some ways they’re the most valuable, because they’re the only natural habitat left.”

The authors don’t identify individual waterways as priorities for riparian conservation. Instead they leave it to regional managers to single out individual areas and choose methods — whether it be working with landowners to keep areas in a natural state, planting native vegetation, removing invasive species along streams, creating easements in property deeds, or other methods – to ensure that riverside land remains friendly to wildlife movement.

“Riparian areas offer a huge bang-for-buck as conservation opportunities in the effort to reconnect our fragmented habitats,” Krosby said. “The nice thing about riparian conservation is it’s a two-fer: The same vegetation that provides cover for terrestrial species moving through riparian zones can, for example, help shade streams to cool water temperatures for aquatic species.”

The study is part of a growing trend in wildlife conservation. This winter, the state of Washington anticipates opening a wildlife overpass over Interstate 90 at Snoqualmie Pass, which will allow animals to safely cross the freeway. That infrastructure in combination with other measures could help animal populations be more resilient to climate change.

“The idea is to have a whole network: You want to make sure that your landscape is permeable to wildlife movement,” Krosby said. “That’s important now, and it’s especially important under climate change, because moving to track shifting habitats is the primary way that species deal with a changing climate.”

###

The research was funded by the Washington Department of Fish & Wildlife, the North Pacific Landscape Conservation Cooperative, the U.S. Fish and Wildlife Service and the Wilburforce Foundation.

Co-authors are David Theobald at Conservation Science Partners, Robert Norheim at the UW’s Climate Impacts Group, and the late Brad McRae at The Nature Conservancy.

For more information, contact Krosby at 206-579-8023 or [email protected].

Media Contact
Hannah Hickey
[email protected]
206-543-2580

Related Journal Article

http://dx.doi.org/10.1371/journal.pone.0205156

Tags: BiologyClimate ChangeEarth ScienceEcology/EnvironmentGeographyHydrology/Water ResourcesMarine/Freshwater Biology
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