Biologists analyze sage-grouse wings to help determine population estimates

    Each year, biologists with the Wyoming Game and Fish Department and other agencies gather together to analyze wings of sage-grouse harvested in Wyoming to help determine an estimate of sage-grouse reproduction of that year.

    In November, biologists with Game and Fish, Bureau of Land Management, U.S. Fish and Wildlife Service and the Natural Resource Conservation District met in Lovell to determine the age and sex of 1,628 sage-grouse wings.  The wings are collected from hunters primarily in central and southwest Wyoming who voluntarily contribute wings by dropping them off at designated collection points during the hunting season.

    Sage-grouse/Sagebrush Biologist Leslie Schreiber said each wing is aged as a chick, yearling or adult and sex is determined by the size, or measurement of the wing.  “This information helps us determine average number of chicks per hen that were produced for the year,” Schreiber said.  “This information, used in conjunction with spring lek counts, gives us insight into how sage-grouse populations are doing in Wyoming.”


    Wyoming sage-grouse populations are cyclic.  “Typically, we see oscillations in sage-grouse populations year to year so biologists look at the trend, or average over a longer period of time,” Schreiber said. “Preliminary data indicates 0.83 chicks per hen this year, which indicates reproduction is down this season.”  A full analysis will be available in the sage-grouse job completion report, which will be available on the Game and Fish website in the spring of 2019.

    A sage-grouse wing is measured to determine sex.

    A male sage-grouse wing (top) and female sage-grouse wing (bottom) are compared side by side.  Biologists use the measurement of the 9th primary feather to determine sex.


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