What does a bear do in the Alaska woods? Disperse seeds

phys.org | 2/17/2018 | Staff
tictac399 (Posted by) Level 3
Click For Photo: https://3c1703fe8d.site.internapcdn.net/newman/gfx/news/2018/whatdoesabea.jpg

Does a bear leave scat in the woods? The answer is obvious but the effects on an ecosystem may not be.

A study by Oregon State University researchers concludes that brown and black bears, and not birds, as commonly thought, are primary distributers of small fruit seeds in southeast Alaska, spreading the seeds through their excrement.

Bears - Farmers - Taal - Levi - Oregon

"Bears are essentially like farmers," said Taal Levi, an Oregon State assistant professor. "By planting seeds everywhere, they promote a vegetation community that feeds them."

Seed dispersal is a key component in the understanding of any ecosystem, Levi said. The study is the first instance of a temperate plant being primarily dispersed by mammals through their gut, Levi said. The finding suggests repercussions for plant life when bears are removed.

Brown - Bears - Grizzlies - Size - Numbers

Brown bears, or grizzlies, flourish in size and numbers in the Tongass National Forest, America's largest, because they gorge on spawning salmon. As they wait for fish to enter streams, they eat berries.

Levi and graduate student Laurie Harrer, the study's primary author, set up motion-triggered video cameras to detect what was eating berries. The collected bear DNA from saliva left on plants after berries disappeared. They recorded birds picking off a few berries at a time but bears gulping them by the hundreds.

Bears - Bears - Berry - Patches

When brown bears shift to eating fish, black bears move into berry patches.

Both bears, through their scat, disperse fruit seeds by the thousands, profoundly affecting what...
(Excerpt) Read more at: phys.org
Wake Up To Breaking News!
Sign In or Register to comment.

Welcome to Long Room!

Where The World Finds Its News!