POWELL — Grizzly bears are dying at a record pace in the Greater Yellowstone Ecosystem, but wildlife officials say that’s a sign of a population that has reached its carrying capacity.
The leader of the Interagency Grizzly Bear Study Team said this week that, despite the deaths, the grizzly population appears to be growing.
There have been 63 known grizzly bear mortalities in the three-state area in 2021, according to the study team, with 42 deaths reported inside the primary conservation area for the species.
Of the deaths within the Demographic Monitoring Area (DMA), 30 were in Wyoming, including 18 euthanized in management decisions. There were also 21 deaths reported outside the DMA, including 13 management removals in Wyoming.
In 2018, a record 32 grizzly bears were euthanized in Wyoming in management decisions by the U.S. Fish and Wildlife Service. That record could be challenged this year. The most recent report of known and suspected grizzly bear mortalities was published Nov. 4 and the ongoing hunting season, plus the species’ natural drive to fill up before hibernation, typically brings additional human-bear conflicts.
The Fish and Wildlife Service makes all final management decisions on relocations and removals of grizzly bears while they are listed for protections under the Endangered Species Act.
Wyoming Game and Fish large carnivore team leader Dan Thompson isn’t pleased with the sole focus on the number of deaths and removals.
“The use of the term ‘record’ or ‘record high’ is always used when talking about mortality, or removals,” he pointed out. “I never hear the term ‘record high’ when we give the highest population estimate … since tracking them in the 1970s, or highest occupied range of grizzly bears in the GYE since perhaps the 1800s.
“Records without context lead to false narratives,” Thompson continued, adding, “One thing that is continually lost is that there is a focus on mortality, but we don’t talk about reproduction and the several hundred cubs that are born every year and overall high survival rates.”
The Interagency Grizzly Bear Study Team estimates the current population inside the DMA at 1,069 bears, which is a record high population estimate from the team, although the team changed how it makes the estimates in the spring. The low side of their estimate is 953 bears, with a high of 1,184.
Population estimates are not kept outside the conservation zone, but grizzly bears euthanized outside the DMA account for about a third of all lethal removals, according to Frank van Manen, leader of the study team.
Despite the recent removals inside the DMA, van Manen said data shows an increasing population in the ecosystem.
“If you look at the dependent yearling cubs, there are well over 300, and that indicates really solid recruitment into this population,” he said at a Yellowstone Ecosystem Subcommittee meeting Monday.
Overall mortality is still within set limits for the species, he said. “Our mortality rates were below a threshold of 5.7% for independent females and 8.1% of independent males.”
The subcommittee works in cooperation with the Interagency Grizzly Bear Study Team, an interdisciplinary group of scientists and biologists responsible for long-term monitoring and research efforts on grizzly bears in the Greater Yellowstone Ecosystem. The team was formed by the Department of the Interior in 1973, with representatives from the U.S. Geological Survey, National Park Service, U.S. Fish and Wildlife Service, U.S. Forest Service, the Eastern Shoshone and Northern Arapaho Tribal Fish and Game Department, and the states of Idaho, Montana and Wyoming.
The interagency approach was used to ensure consistency in data collection and allows for combining limited resources to address needs throughout grizzly bear habitat. However, they are not a governing body or legal authority, said Fish and Wildlife Service biologist Jennifer Fortin-Noreus.
While managers are sometimes forced to turn to euthanization, there are several non-lethal programs in progress including electric fencing and hazing efforts.
Mike Foster, director of the U.S. Department of Agriculture’s Wildlife Services in Wyoming, said his agency is working on a hazing wagon to help control conflicts.
“It will help for the first few days or a week until we can figure out something else to do,” he said.
Foster picked up the idea from the Park County Predator Management Advisory Board, including board member Shane Smith of Powell. Solar panels power the trailers, which are set by timers to activate periodically during the night. Building the apparatus in the back of a trailer allows it to be moved to fields as needed to stem livestock losses.
Meanwhile, “We’ve strung miles and miles of electric fence around chicken coops, and feed yards and pig pens, and you name it,” said Jim White, Idaho Department of Fish and Game regional supervisor.
He added that, “this non lethal work has prevented a tremendous amount of damage and saved a lot of control work.”