News / USA

    Wolverines Stage a Comeback

    But global warming threatens the long-term survival of the species

    This remote camera photo of a wolverine was taken in the Okanogan National Forest  in Winthrop, Washington.
    This remote camera photo of a wolverine was taken in the Okanogan National Forest in Winthrop, Washington.

    Multimedia

    Audio
    Tom Banse

    One of the rarest mammals in North America is staging a comeback in the mainland United States. Wildlife biologists have tracked wolverines on mountainsides where they haven’t been seen in many decades. But several new studies suggest the recovery could be short-lived if the animals’ mountain snowline habitat continues to retreat due to global warming.

    If you’re willing to settle for a mascot, the legendary wolverine is easy to find in the USA. It’s the namesake of countless high schools, a bunch of colleges and several American university sports teams. But if you want to see an actual wolverine in the wild, good luck. Despite the fact that the brown, shaggy carnivores are among the largest members of the weasel family and reach weights up to 15 kilograms, these stocky scavengers are extremely elusive. The biologists who study them rely on radio tracking technology and aircraft or snowmobiles to improve the odds of finding their quarry.

    John Rohrer, a district biologist for the Okanagan-Wenatchee National Forest, also uses dead deer heads to lure elusive wolverines. "They’re in this winter environment that we think is so harsh and so inhospitable, and they’re loving it."

    A remote camera photo of a wolverine attracted by a lure set up by biologists in the Okanogan National Forest.
    A remote camera photo of a wolverine attracted by a lure set up by biologists in the Okanogan National Forest.

    Rohrer, Scott Fitkin and company have set up 11 live capture traps in the high country east of the Cascade Crest. Both men have worked with all sorts of interesting critters, but hold a special reverence for the wolverine.

    "These are the most charismatic animals I’ve worked with over 20 years in my career," says Fitkin. "They have a lot of personality. They’re certainly individuals. Each one is a little different in the way they react to us. They’re a very beautiful animal. Everything about them is just interesting."

    They’re also really rare. Trapping and deliberate poisoning more or less wiped out the wolverine from the contiguous United States. But now wolverines have moved down from Canada to reoccupy their historic ranges.

    This is the sixth season Rohrer and Fitkin have pursued the elusive scavengers. Captures are rare. Fitkin videotaped the most recent one of a wolverine they named Rocky.

    When the field crew catches a wolverine, they attach a GPS tracking collar and set the animal free again. Study leader Keith Aubry can monitor the signals from his desk at the Forest Service’s Pacific Northwest Research Station in Olympia.

    Aubry says the wolverine’s rebound appears fragile. "The populations are not dense and they’re not reproducing rapidly. So it’s a precarious situation."

    Wildlife biologists John Rohrer and Scott Fitkin check a wolverine trap in Washington’s North Cascades.
    Wildlife biologists John Rohrer and Scott Fitkin check a wolverine trap in Washington’s North Cascades.

    Aubry, who is working on a science journal paper on the topic, believes global warming poses the biggest threat to wolverines because the animals need long-lasting snow cover to dig the snow caves in which they give birth.

    "The denning period, weaning, occurs about in mid-May," he says. "They need snow cover that persists to mid-May to provide these dens for the kids. If snow starts melting early, the den could start collapsing."

    The Forest Service is funding a parallel study in central Idaho. But in Idaho, the wolverines aren’t the only ones being tracked. The research team led by biologist Kim Heinemeyer is asking snowmobilers and backcountry skiers to voluntarily carry GPS tracking units, too. That lets Heinemeyer see whether human recreation affects the wolverines.

    "It’s a very complicated question that we’re trying to answer," says Heinemeyer. "While we have resident animals in the landscape and some of them have successfully denned we believe, we don’t know the potentially more subtle interactions that may happen between winter recreation and wolverines."

    In December, the U.S. Fish and Wildlife Service classified wolverines as a candidate for endangered species protection. This was in response to several conservation groups who petitioned the service to have the wolverine listed as threatened or endangered. The federal agency agreed with the petitioners that climate change poses a long-term threat to the animal’s survival in the contiguous U.S. But officials say full endangered species protection for the wolverine is "precluded" right now by the need to direct resources to higher-priority cases.

    You May Like

    Multimedia Obama Calls on Americans to Help the Families of Its War Dead

    In last Memorial Day of his presidency, Obama lays wreath at the Tomb of the Unknown Soldier at Arlington National Cemetery

    The Strife of the Party: Will Trump Permanently Alter Republicans?

    While billionaire mogul's no-holds-barred style, high-energy delivery are what rocketed him to nomination, they also have created rift between party elites and his supporters

    China's Education Reforms Spark Protest

    Beijing is putting a quota system in place to increase the number of students from poor regions attending universities

    This forum has been closed.
    Comments
         
    There are no comments in this forum. Be first and add one

    Featured Videos

    Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
    Chinese-Americans Heart Trump, Bucking National Trendi
    X
    May 27, 2016 5:57 AM
    A new study conducted by three Asian-American organizations shows there are three times as many Democrats as there are Republicans among Asian-American voters, and they favor Hillary Clinton over Donald Trump. But one group, called Chinese-Americans For Trump, is going against the tide and strongly supports the business tycoon. VOA’s Elizabeth Lee caught up with them at a Trump rally and reports from Anaheim, California.
    Video

    Video Chinese-Americans Heart Trump, Bucking National Trend

    A new study conducted by three Asian-American organizations shows there are three times as many Democrats as there are Republicans among Asian-American voters, and they favor Hillary Clinton over Donald Trump. But one group, called Chinese-Americans For Trump, is going against the tide and strongly supports the business tycoon. VOA’s Elizabeth Lee caught up with them at a Trump rally and reports from Anaheim, California.
    Video

    Video Reactions to Trump's Success Polarized Abroad

    What seemed impossible less than a year ago is now almost a certainty. New York real estate mogul Donald Trump has won the number of delegates needed to secure the Republican presidential nomination. The prospect has sparked as much controversy abroad as it has in the United States. Zlatica Hoke has more.
    Video

    Video Drawings by Children in Hiroshima Show Hope and Peace

    On Friday, President Barack Obama will visit Hiroshima, Japan, the first American president to do so while in office. In August 1945, the United States dropped an atomic bomb on the city to force Japan's surrender in World War II. Although their city lay in ruins, some Hiroshima schoolchildren drew pictures of hope and peace. The former students and their drawings are now part of a documentary called “Pictures from a Hiroshima Schoolyard.” VOA's Deborah Block has the story.
    Video

    Video Vietnamese Rapper Performs for Obama

    A prominent young Vietnamese artist told President Obama said she faced roadblocks as a woman rapper, and asked the president about government support for the arts. He asked her to rap, and he even offered to provide a base beat for her. Watch what happened.
    Video

    Video Roots Run Deep for Tunisia's Dwindling Jewish Community

    This week, hundreds of Jewish pilgrims are defying terrorist threats to celebrate an ancient religious festival on the Tunisian island of Djerba. The festivities cast a spotlight on North Africa's once-vibrant Jewish population that has all but died out in recent decades. Despite rising threats of militant Islam and the country's battered economy, one of the Arab world's last Jewish communities is staying put and nurturing a new generation. VOA’s Lisa Bryant reports.
    Video

    Video Meet Your New Co-Worker: The Robot

    Increasing numbers of robots are joining the workforce, as companies scale back and more processes become automated. The latest robots are flexible and collaborative, built to work alongside humans as opposed to replacing them. VOA’s Tina Trinh looks at the next generation of automated employees helping out their human colleagues.
    Video

    Video Wheelchair Technology in Tune With Times

    Technologies for the disabled, including wheelchair technology, are advancing just as quickly as everything else in the digital age. Two new advances in wheelchairs offer improved control and a more comfortable fit. VOA's George Putic reports.
    Video

    Video Baby Boxes Offer Safe Haven for Unwanted Children

    No one knows exactly how many babies are abandoned worldwide each year. The statistic is a difficult one to determine because it is illegal in most places. Therefore unwanted babies are often hidden and left to die. But as Erika Celeste reports from Woodburn, Indiana, a new program hopes to make surrendering infants safer for everyone.
    Video

    Video California Celebration Showcases Local Wines, Balloons

    Communities in the U.S. often hold festivals to show what makes them special. In California, for example, farmers near Fresno celebrate their figs and those around Gilmore showcase their garlic. Mike O'Sullivan reports that the wine-producing region of Temecula offers local vintages in an annual festival where rides on hot-air balloons add to the excitement.
    Video

    Video US Elementary School Offers Living Science Lessons

    Zero is not a good score on a test at school. But Discovery Elementary is proud of its “net zero” rating. Net zero describes a building in which the amount of energy provided by on-site renewable sources equals the amount of energy the building uses. As Faiza Elmasry tells us, the innovative features in the building turn the school into a teaching tool, where kids can't help but learn about science and sustainability. Faith Lapidus narrates.

    Special Report

    Adrift The Invisible African Diaspora