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Wyoming Range mule deer population declines after severe winter of 2022-23
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The Wyoming Game and Fish Department reports their wildlife managers have completed an aerial population survey of the renowned Wyoming Range mule deer herd, and now have a better understanding of how the 2022-23 severe winter impacted the population. Wildlife biologists estimate the current herd number to be about 11,000 animals — a considerable decline from the February 2023 estimate of 30,000 individuals.
According to the Department, earlier this winter, biologists and game wardens recorded classification data for the Wyoming Range deer herd by flying over portions of winter ranges in a helicopter and tallying the number of observed fawns, does, yearling bucks and adult bucks.
Results from the classification survey indicate the fawn ratio for the deer herd was 34 fawns for every 100 does — the lowest on record since the herd was designated in 1982. Low fawn ratios can be attributed to the intense energy demands of a harsh winter.
The buck ratio was observed to be 24 bucks for every 100 does, which also is one of the lowest on record. Wildlife managers observed low yearling buck numbers, which can be attributed to the high mortality of buck fawns that came into the 2022-2023 winter. This herd is managed toward a buck ratio objective of 30-45 bucks per 100 does.
Recovery of the Wyoming Range mule deer herd will depend on a multitude of factors, but the most important factor will be Mother Nature. Consecutive years of favorable weather patterns will be critical components for the deer herd’s recovery.
Game and Fish report that on a brighter note, the adjacent Sublette mule deer herd was not affected as strongly by the severe winter of 2022-23. Classification flights indicated total buck ratios of 34 for 100 does, and fawn ratios of 60 for 100 does. The buck and doe ratios were lower than average, but expected after a harsh winter.
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