In 1946, the Argentinian government imported fifty beavers from Canada, which were to be released in Cami Lake with the intention of creating a commercial fur trading industry. Though a viable industry ultimately failed to materialize, the introduction of the beavers into the region has had far-reaching consequences. The North American beavers have no natural predators in the area. In their native habitats such as Canada, bears and coyotes prey on the beavers and keep the population under control. One observer noted that anyone considering importing beavers should also import bears, those being beavers' natural predators. According to a June 2011 NPR report, 200,000 beavers are living in the area. Another report puts the number in excess of 100,000, and states the level of destruction as akin to having bulldozers thrashing through the area. Tierra del Fuego National Park in Argentina is especially threatened, as the beavers are destroying long-protected trees. The animals have spread beyond Tierra del Fuego itself into the Brunswick Peninsula of Chile, and the government fears further penetration into continental South America. The beavers already threaten around sixteen million hectares of indigenous forest. Unlike many trees in North America, trees in South America often do not regenerate when coppiced, destroying the forest. As well as felling trees, beavers create dams that flood certain areas and thus drown other trees and vegetation. Flooding from beaver dams also damages roads and cattle-grazing pastures. Ecologist Christopher Anderson, professor at the Universidad de Magallanes, has said, "The change in the forested portion of this biome is the largest landscape-level alteration in the Holocene — that is, approximately 10,000 years". A 2017 survey among Tierra del Fuego land managers and researchers shows significant support in eradicating beavers and restoring the landscape. The support for eradication is strongest among managers while the support for restoration is stronger among researchers.
Methods
Some park rangers use steel traps that snap down on the animal's head and instantly kill it. Private individuals receive rewards for trapping beavers, although success has been elusive. Government officials plan to bring in professional trappers who have specialized dogs and use helicopters and boats to move in rolling fronts. The efforts have been subjected to scientific study. Currently, the emphasis in the Tierra del Fuego National Park is on control, not on eradication.
