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    Home Climate

    As Ice Melts on U.S. Mountains, Sheep and Goats Battle Over Resources

    the goats are winning.

    By: Paige Bennett
    Updated: October 17, 2022
    Edited by Irma Omerhodzic
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    mountain sheep and rams
    A mountain goat moves toward three bighorn rams at a high-elevation snow patch in Glacier national park. Forest P. Hayes
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    Scientists studying over 1,500 miles of the Rocky Mountains have documented competition between mountain goats and bighorn sheep. The competition is over resources that are being uncovered as glaciers melt. A newly released study documents these previously unknown conflicts and shows that most of the time, the goats are winning.

    The Wildlife Conservation Society (WCS), Colorado State University and the National Park Service are responsible for the study, which reviewed a 1,500-mile span of the U.S. Rocky Mountains. As glaciers melt, more minerals, including salt licks and potassium deposits, are being exposed, and the mammals compete over access to these resources. The study was published in the journal Frontiers in Ecology and Evolution.

    “While humans continue to be justifiably concerned about the climate-induced havoc we’re wreaking planet-wide, much has remained unknown about species aggression among our mammalian brethren” said Joel Berger, lead author of the study, senior scientist for WCS and the Barbara Cox-Anthony Chair of Wildlife Conservation at Colorado State University. 

    Scientists were surprised to find that among the conflicts, the goats won more often than bighorn sheep. Mountain goats won more than 98% of battles at three sites from Colorado to Alberta, Canada. 

    “We were surprised that mountain goats won,” Berger told the Washington Post. “Naively, I was just thinking, we’ve got two similar-sized species and they both live in these mountains. And if everything was equal, then half the time we’d expect one to win and half the time the other.”

    While mountain goats are native in the northwestern U.S., they are not native to Colorado and Wyoming. The observations bring concerns that the mountain goats may outcompete the native bighorn sheep.

    Scientists suspect melting glaciers that expose resources are part of the problem, but the interactions may also be driven by human activity, like building roads and artificial sources of water that restrict natural resources for the animals.

    “If we can’t offer species other than ourselves a chance, we’re just cooking our fates along similarly destructive paths,” Berger said in a statement.

    As reported by The Guardian, the Rocky Mountains have lost over 300 glaciers over the past 100 years. NASA’s Earth Observatory shared that by 2030, most of the glaciers in Glacier National Park will no longer be visible. These ongoing and rapid changes due to global warming could further impact species in these mountainous habitats.

    “Not long ago these areas were covered in ice and snow. They’ve now opened up and there’s some conflict over access,” Berger told The Guardian. “Direct conflict isn’t something any of these species want, but this is what happening.”

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      Paige Bennett

      Based in Los Angeles, Paige is a writer who is passionate about sustainability. She earned her Bachelor’s degree in Journalism from Ohio University and holds a certificate in Women’s, Gender and Sexuality Studies. She also specialized in sustainable agriculture while pursuing her undergraduate degree.
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