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  • Aquatic Invasions! A Menace to the West : Nutria Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    The nutria is a large, semi-aquatic rodent native to South America. Nutria were introduced to the United States for their fur. After a boom in nutria ranches during the 1930s, the animals escaped or were released from fur farms in the Pacific Northwest, Louisiana and other states, where theyare now...
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    . In the state of Washington, the nutria is classified as a Prohibited Aquatic Animal Species (WAC 220

  • Aquatic Invasions! A Menace to the West : Colonial Tunicates Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    What ancient animal in modern times has a primitave spinal cord that may resemble the first vertebrates on earth, spends most of its life stuck to a boat or rock, produces an exoskeleton made of cellulose and is more associated with plants than animals? Tunicates are marine invertebrate filter feeders...
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    This fact sheet is part of Aquatic Invasions: A Menace to the

  • Aquatic Invasions! A Menace to the West : Crayfish Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    Crayfish are one of the most threatened groups of animals in the world. About 45 percent of North American crayfish species are considered to be at risk of extinction. However, a few crayfish species are among the world's most invasive freshwater organisms. Taking into consideration that invasive crayfish are the...
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    sunfish (Lepomis spp.).” Canadian Journal of Fisheries and Aquatic Sciences 61:2135–2143. D’Abramo, L

  • Vet Gazette ; May 12, 2008

    Creator:
    Oregon State University. College of Veterinary Medicine and Clarke, Cyril
    Abstract:
    Bi-weekly newsletter of the Oregon State University College of Veterinary Medicine.
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    eNewsletter May 12, 2008 Calendar MacVicar Animal Health Lecture The MacVicar Animal Health Lecture

  • Aquatic Invasions! A Menace to the West : Knotweed Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    Knotweeds are a group of closely related invasive plants from Asia. Knotweeds are very tall plants that can grow to over three meters with bamboo-like hollow stems and heart-shaped or lance-shaped leaves. They spread quickly and form tall, dense thickets. They dominate stream banks, sides of roads, gardens, and other...
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    estab­ lishment of trees that are critical to riparian health. Trees are important along streams and

  • Aquatic Invasions! A Menace to the West : American Bullfrog Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    The American Bullfrogs are a highly reproductive aquatic species that are native in central, eastern United States and Southeastern Canada. This species was first introduced to western America as a food source (frog legs!); since then it escaped aquaculture ponds and have spread widely. Bullfrogs lay up to 20,000 eggs...
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    of Aquatic Invasions: A Menace to the West! A Toolkit Linking Science, Community, and Action through

  • Aquatic Invasions! A Menace to the West : Zebra and Quagga Mussels Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    Colonies of millions of quagga and zebra mussels foul and clog pipes, water treatment plants, and dam turbines and give a competitive boost to toxic algae. It takes only one contaminated boat and the right conditions for zebra and quagga mussels to infest a new watershed; once they have been...
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    mussels (Unionoida) following the zebra mussel (Dreissena polymorpha) invasion. Journal of Animal

  • Aquatic Invasions! A Menace to the West : New Zealand Mudsnail Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    New Zealand mudsnails are a highly invasive species of freshwater mollusk of the family Hydrobiidae, also known as spring snails. Their ability to clone themselves and maintain high reproductive rates allows them to rapidly spread throughout the western United States. Some estimates indicate that one female can clone and produce...
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    enhancement and restoration projects to improve the health and resilience of watersheds. Exercise caution

  • Aquatic Invasions! A Menace to the West : Chinese Mitten Crabs Species Guide

    Creator:
    Siemens, Tania
    Abstract:
    The Chinese mitten crab was first identified in the south San Francisco Bay in 1992 by commercial shrimp trawlers, and quickly spread to the Sacramento and San Joaquin Rivers. The Chinese mitten crab threatens ecosystems, earthen structures, and fisheries by preying on and competing with many species, including fish eggs,...
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    Learning extensions Resources This fact sheet is part of Aquatic Invasions: A Menace to the West! A

  • Vet Gazette ; October 15, 2007

    Creator:
    Oregon State University. College of Veterinary Medicine
    Abstract:
    Bi-weekly newsletter of the Oregon State University College of Veterinary Medicine.
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    ” of the faculty that taught classes then. A highlight of the tour was to see the large animal