Two female grizzly bears have been transplanted from the Whitefish Range to the Cabinet Mountains as part of an ongoing effort to augment the imperiled Cabinet-Yaak grizzly bear population.

The 2-year-old siblings were captured in the Deadhorse Creek drainage on the Flathead National Forest and moved Friday to the Spar Lake area in the West Cabinets.

The bears have no history of conflict with people and have never been captured before. Those factors plus their young age are part of the criteria for the augmentation program, a cooperative effort between Montana Fish, Wildlife and Parks and the U.S. Fish and Wildlife Service.

The state agency captures the bears while the federal agency monitors them after their release. The bears are fitted with Global Positioning System tracking collars to allow for their movements to be monitored.

Friday’s release marks the 12th and 13th grizzly bears to released into the Cabinets since 2005.

In the early 1990s, three grizzly bears were moved into the Cabinets. Most of the bears that have been moved have been females.

Last year, a study that made use of genetic analysis of bear hair samples produced a population estimate of 42 bears for the Cabinet-Yaak region.

According to Wayne Kasworm, a biologist with the Fish and Wildlife Service based in Libby, that estimate means that there may have been fewer than 15 grizzy bears prior to 1990, and that indicates that the grizzly population might have vanished without the augmentation efforts.

As of last year, it was still unknown if any of the bears that have been moved since 2005 have reproduced. That’s partly because the young bears were moved well before they reached reproductive age of 5 or 6 years old, and they drop their tracking collars within a couple of years.

Reporter Jim Mann may be reached at 758-4407 or by email at jmann@dailyinterlake.com.