DILLON (AP) - The population of Arctic grayling has dropped dramatically in their last stronghold, the Big Hole River of southwestern Montana, biologists have discovered. Population Viability of Arctic Grayling in the Gibbon River, Yellowstone National Park AMBER C. STEED* 1 Montana Cooperative Fishery Research Unit and Department of Ecology, Montana State University, Post Office Box 173460, Bozeman, Montana 59717, USA ALEXANDER V. ZALE In May 2019, Michigan obtained 10,000 grayling eggs from Alaska’s Chena River, home to a vibrant, self-sustaining population of the species. Back in 2014, they considered calling the grayling extinct, but denied it. The Michigan population died out in the 1930s; Montana’s grayling began their decline in the 1980s. wind speeds 207-260 mph) tornado 45.2 miles away from the Grayling city center killed 2 people and injured 24 people and caused between $50,000 and $500,000 in damages. Arctic grayling in Montana exhibit unique genetics when compared to Alaskan and Canadian populations. The Ninth Circuit ruled Friday the U.S. The two populations are commonly called Montana Arctic grayling. “Genetically, they should be rock-solid,” Eisch said. Grayling live in mostly high-altitude lakes and rivers in the state. In civilian labor force, total, percent of population age 16 years+, 2014-2018: 63.1%: In civilian labor force, female, percent of population age 16 years+, 2014-2018: 59.4%: Total accommodation and food services sales, 2012 ($1,000) 2,420,455: Total health care and social … The fluvial population comprises the Upper Missouri River distinct population segment (DPS) population. Thus, Montana Arctic grayling are both geographically and biochemically identifiable from northern populations. Fish and Wildlife Service incorrectly denied endangered listing to a cold-water fish living in the Upper Missouri River Basin in Montana. The Montana population of grayling was once found in nearly all rivers of the Upper Missouri system including the Sun, Smith, Gallatin, Jefferson, Big Hole, Red Rock, Ruby, and Madison. The second component focuses on the Arctic grayling population in the Big Hole River, Montana. Tornado activity: Grayling-area historical tornado activity is significantly below Michigan state average.It is 52% smaller than the overall U.S. average.. On 4/3/1956, a category F4 (max. At one time, Montana Arctic grayling were found throughout Missouri headwaters above Montana's Great Falls, but river diversion and degradation have reduced the species to a single population on a 50-mile stretch of the Big Hole River. The objectives are to characterize the genetic diversity, effective population size, and population structure of Arctic grayling in the Big Hole River based on individuals collected during three different time periods (1980s, 1990s, and 2000s) using microsatellite DNA markers. The population of the Montana arctic grayling seems to be declining, and there are some calls for the state to reconsider its stance on the fish being endangered. The arctic grayling existed mostly in Michigan and Montana decades ago. To make matters worse, seven consecutive years of drought and rampant water withdrawal have plagued the area. The Montana Arctic grayling (Thymallus arcticus montanus) is a North American freshwater fish in the salmon family Salmonidae.The Montana Arctic grayling, native to the upper Missouri River basin in Montana and Wyoming, is a disjunct population or subspecies of the more widespread Arctic grayling (Thymallus arcticus). Grayling, Michigan detailed profile. Additional research has shown that the fluvial population in the Big Hole River is genetically different from populations in the Red The Population of Arctic Grayling in Montana. Arctic grayling existed mostly in Michigan and Montana decades ago and Wildlife Service incorrectly denied listing. 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