This video, How Wolves Change Rivers, explains the “balance-of-nature“ phenomena scientists call a “trophic cascade.” NWNL also documented this on its Greater Yellowstone Ecosystem Expedition in 2008. When wolves were reintroduced into Yellowstone National Park, it had a very beneficial impact on the ecosystem and on water flows. Although the video mislabels the elk as “deer”, its message is relevant.
The influence of just a small group of wolves on river systems is as magical as the cry of the wolf itself. For a sense of being on the Yellowstone River in the Missouri-Mississippi headwaters, do look at our Yellowstone Species photo gallery.
– Posted by Jasmine Graf, NWNL Associate Director