Here is a great article about how invasive species can change food webs.
In Yellowstone National Park, invading lake trout have decimated the cutthroat trout that grizzly bears normally eat. Now, hungry grizzlies are preying on the calves of migrating elk instead. Since lake trout took over Yellowstone Lake, the number of cutthroat trout has plunged by more than 90 percent. Grizzly bears that used to feast on […] Read More