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Zebra Mussel Prevention at Lake Powell
Glen Canyon National Recreation Area
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Meet the Zebra Mussel Small invasive mussel with varying stripes
Dreissena polymorpha and D. bugensis (quagga mussel) Small invasive mussel with varying stripes Attaches to surfaces with byssal threads
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Cost to Facilities Forms thick mats Fills intake pipes
Clogs trash screens Encrusts docks, launch ramps, rocks, and anything else in the water
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Cost to Recreation Encrusts Boats Clogs Engines
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Cost to Recreation Encrusts Boats Clogs Engines
Covers beaches with sharp shells Fills air with stench of decay
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Ecological Damage No ecologically friendly way to eradicate
Encrusts and kills any bottom critters (clams, crayfish, …)
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Ecological Damage No ecologically friendly way to eradicate
Encrusts and kills any bottom critters (clams, crayfish, …) Filters enormous amounts of algae, disrupting the food chain No natural predators of consequence Accumulates toxins: Biomagnification
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Why Lake Powell? Considered the most likely point of introduction to the Colorado River System Good Conditions for Zebra Mussels
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Why Lake Powell? Considered the most likely point of introduction to the Colorado River System Good Conditions for Zebra Mussels Mussels are transported on boats, in bilge water, in engines, on trailers, with bait
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Life Cycle
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History of Invasion From the Caspian and Black Seas
Took over all of Europe
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History of Invasion From the Caspian and Black Seas
Took over all of Europe Came to America in ballast water Discovered in Lake St. Clair in 1988 Moved through the Great Lakes and 8 major rivers in the East
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Zebra Mussel Spread
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What is being done for the Colorado River System?
Lake Powell Prevention Program Utah Aquatic Nuisance Species Action Team Utah Division of Wildlife Resources Education through signs and brochures Boat inspections at 15 State Parks
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What is being done for the Colorado River System?
Lake Powell Prevention Program Utah Aquatic Nuisance Species Action Team Utah Division of Wildlife Resources Education through signs and brochures Boat inspections at 15 State Parks 100th Meridian Initiative National Invasive Species Act (1996) Forum for multi-agency cooperation Stop the spread of Aquatic Nuisance Species from East to West at the 100th Meridian
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Lake Powell Prevention
Monitoring Screening Washing
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Visitor Screening Has your vessel been used east of the Rocky Mountains in the past 30 days? In which state(s) or province(s) east of the Rocky Mountains was your vessel used? Alabama, Arkansas, Illinois, Indiana, Iowa, Kentucky, Louisiana, Michigan, Minnesota, Mississippi, Missouri, New York, Ohio, Oklahoma, Pennsylvania, Tennessee, Vermont, West Virginia, Wisconsin, Ontario Canada, Quebec Canada
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Prevention Packet Informative pamphlet Coupon for boat washing
Map to washing facilities
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Washing Procedure Assume boat is infested Remove any organic matter
High pressure wash Hull, lines, bumpers, motor, trim tabs, anchor trailer, and all nooks and crannies Drain and flush any water >140 degrees F Bilge, live wells, bait buckets, cooling system
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Washing Procedure
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Washing Procedure
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Prevention Program Results for the 2001 Season
13 potentially infested boats entered 9 were voluntarily washed Roughly the same as 2000
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For more information Mark Anderson 928-608-6266 Mark_Anderson@nps.gov
Web Resources
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National Park Service Mission
Protect resources Provide recreation Web Resources
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