What is an invasive species?Plants, animals, or other organisms become invasive:(1) when they are transported (primarily by human actions) into a new ecosystem,(2) where they are non-native (alien), (3) and cause or are likely to cause economic or environmental harm or harm to human health.What species have invaded the Alaska Maritime Refuge?Arctic and red foxesNorway rats, black rats, house and deer miceArctic ground squirrelsHoofed animals (reindeer, caribou, cattle, sheep, horses)Others (voles, hares, hoary marmots, plants)
What damage have these alien animals caused on the refuge?
Why are islands more at risk from invasive species?
What can be done?
What is being done about invasive species on the refuge?(1) Prevention (Quarantine)
3) Restoration of Native Wildlife
Learn moreRestoring Alaska's Islands Fact Sheet (pdf)Refuge invasive species programsHistoric backgroundEnvironmental Assessment for Restoring Wildlife Habitat on Rat Island (pdf)Invasive Species Eradication for Habitat Restoration on Tangik, Poa and Sud IslandsRelated LINKSWWW.StopRats.com (map of where the rats are in Alaska, comprehensive discussion of impacts on wildlife, how to protect your boat and town, on-line ordering of rat kits - a product of the Stop Rats Outreach Team - more than a dozen organizations working to halt the spread of rats in Alaska)Gateway to Federal and State Invasive species activities and programs (impacts, species profiles, geographic information, news and events, laws and regulations)Wildlife and People at Risk: A Plan to Keep Rats Out of Alaska, ADF&GInvasive Species Specialist Group - The World Conservation Union (focus on biodiversity loss, especially threats to oceanic islands)Cooperative Initiative on Island Invasive Alien Species - The World Conservation UnionNational Biological Information Infrastructure - U.S. Geological Survey (current biological issues, geographic perspectives, teacher resources)Invasive Species: Alaska (16 page pdf ) (Union of Concerned Scientists)
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Rock ptarmigan (Lagopus mutus) occur throughout Alaska. Fourteen subspecies of rock ptarmigan are found in North America. Seven of the fourteen subspecies occur in the Aleutians, and six of these occur on only one or a few islands.