Presence of lake trout has impacted bald eagles, ospreys and bears, study shows.
An invasion of trout at Yellowstone lake impacted wildlife populations throughout the ecosystem of the National Park, scientists have discovered. The lake trout, which were first discovered in Yellowstone in 1994, caused population changes to predators including bald eagles, ospreys and grizzly bears—unexpected impacts never before documented by scientists.
Todd Koel, a scientist with the National Park Service and lead author of the study, said the lake trout were intentionally introduced to Lewis Lake in Yellowstone in 1890 by the U.S. Fish Commission. How they ended up in Yellowstone Lake is unclear, but it is thought they were transported by anglers illegally in the 1980s and 90s.
In the latest study, the team studied data on populations of lake trout, cutthroat trout and other native populations from over four decades—revealing the shift in patterns that emerged after the lake trout invasion. Findings showed that as well as having a negative impact on cutthroats, the lake trout also led to a huge decline in osprey numbers—between 1987 and 1991 there were 38 nests on average, but by 2013 to 2017 there were only three.
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