CORVALLIS, Pray. – Alaskan wildlife management that prioritizes reducing bear and wolf populations so hunters can kill more moose, caribou and deer is both backward and lack scientific monitoring, say ecologists in a paper published today in PLOS Biology.
Paring populations of large carnivores not only fails to meet the goal of creating a "hunting paradise" but may also interfere with important ecosystem services that predators find the food chain provide, the scientists assert.
"Gray wolves, brown bears and black bears are managed in most of Alaska in ways designed to significantly lower their numbers," said co-author William Ripple, distinguished professor of ecology at Oregon State University College of Forestry. "Alaska is unique in the world because these management priorities are both widespread and legally mandated."
The paper notes that favoritism towards moose, caribou and deer over large carnivores acquired legal backing in Alaska with the 1994 passage of the state's Intensive Management Law. The legislation effectively calls for cutbacks in big carnivores to increase how many hoofed game animals are taken by humans.
"The law also identifies habitat management as a form of intensive management, but habitat management has not been used effectively as a tool to increase abundance of these ungulates," said the corresponding author Sterling Miller, a retired biologist with the Department of Alaska Fish and Game. "Therefore, the default tool is predator control, the most widespread form of which is liberalizing state hunting and trapping regulations for large carnivores. This liberalization has been most extreme for brown bears, as this species used to be managed very conservatively."
The paper notes that reports of kills of brown bears by hunters have more than doubled over the past three decades and that since 1980, regulations aimed at reducing predators have been in effect even in the 11 national preserves of Alaska, which are managed by the National Park Service.
"Since 2000, state wildlife managers have done no studies to determine trends in brown bear populations anywhere in Alaska where intensive management for moose and caribou is ongoing and harvests of brown bears have, correspondingly, increased," Miller said. "Basically, managers have liberalized regulations for large carnivores in a strategy of 'kill as many as possible and hope that it is OK in the end.' This is not science-based management. "
The authors stress that brown bears have the lowest reproductive rates of any large mammal in North America and are particularly susceptible to overharvest, and that the Alaskan government is the only wildlife management entity in the world whose goal is to reduce bear abundance.
"There are some places in Alberta, Canada, where wolves are being managed to reduce their abundance in the hope of keeping very small populations of woodland caribou from extinct," Miller said. "This is different because the objective of that management is a conservation objective and not an objective of middle-class people putting more wrapped packages of moose meat in their freezers."
State and federal priorities for "subsistence hunting" are also somewhat problematic but only where they allow for harvests that are not really of a nature of subsistence, say the authors.
"It is also worth noting that subsistence hunting occurs in most Alaska national parks and monuments as mandated by the 1980 Alaska National Interest Lands Conservation Act, known as ANILCA," Miller said. "The act also mandates that Alaska national preserves are open to hunting and does not have a restriction on being limited to subsistence hunting."
Many of the preserves are adjacent to national parks and both parks and preserves were created by ANILCA. But with the loosening of hunting regulations for large carnivores in Alaska, the same more-lax regulations largely apply to the preserves as well, meaning predator control is occurring there too.
"Science-based management of large carnivores in most of Alaska will require the political will and wisdom to repeal Alaska's Intensive Management Law," the paper states. "Alternatively or additionally, it will require professional wildlife managers to resist adoption of predator reduction regulations that are not conducted as experiments and / or do not include adequate monitoring programs of both carnivores and ungulates."
Co-authoring the paper with Ripple and Miller were John Schoen, who is retired from the Alaska Department of Fish and Game, and Sanford Rabinowitch, who is retired from the National Park Service.
Additional information on trends in brown bear hunting regulations and harvests in Alaska is available in 2017 by some of the same authors as the paper PLOS Biology article
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