Study shows rising forest cover in buffers boosts wildlife species near farms
A recent study from the University of Illinois Urbana-Champaign shows that riparian forest buffers offer large benefits to wildlife and ecosystems in agricultural regions. Riparian buffers are strips of trees along streams and rivers, often planted by farmers to control erosion and improve water quality. The new research highlights how these buffers also support more terrestrial species.
“We found raccoon and common snapping turtle DNA all over the place,” said senior study author Eric Larson, associate professor in the Department of Natural Resources and Environmental Sciences (NRES), part of the College of Agricultural, Consumer and Environmental Sciences at Illinois. “But the fact that we found bobcats and big brown bats with our sampling method was exciting, and shows just how much is going on in those riparian buffers.”
Researchers used environmental DNA metabarcoding, a tool that detects tiny DNA traces animals leave behind in water. By sampling water near farmland across 47 sites in Central Illinois, the team was able to identify land-based species that visited or lived near these streams. This method allowed them to detect rare and hard-to-observe species.
The study found a direct link between forest cover and biodiversity. For every 10 percent increase in tree cover, the number of detected species rose by one. Areas with complete forest cover supported three times more wildlife than areas without trees. Researchers detected common animals like raccoons and snapping turtles but were excited to also find bobcats, big brown bats, salamanders, hummingbirds, and river otters.
Animal communities changed with forest levels. Sites with fewer trees contained grassland species like mice, killdeer, and ground squirrels. Forest-covered areas supported species that rely on shade and stable habitats.
Some landowners worry that riparian buffers may attract pests or make fields look messy. However, the study explains that many species found in these areas, including bats, help reduce crop pests. Buffers also improve soil health, reduce erosion, and protect streams from pollution.
Researchers hope this evidence encourages greater adoption of riparian buffers. The study was supported by USDA funding through Hatch and McIntire-Stennis programs and published in the Journal of Applied Ecology.
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