Both species have limited salt tolerance but can otherwise tolerate a wide range of water conditions. bugensis) has been detected in Lake Mead and parts of Southern California. The similar and closely related quagga mussel (D. Native to the Black, Caspian, and Azov Seas, the zebra mussel (Dreissena polymorpha) reached the North American Great Lakes in the ballast water of a cargo ship and is now widely established east of the Rockies, with outlying populations in Colorado, Utah, and San Justo Reservoir in San Benito County, California. On March 3, Martha Volkoff at the California Department of Fish and Wildlife in Sacramento, responsible for the detection and monitoring of invasive aquatic species, was notified that one of the most-watched invasives in the West, hitchhiking in aquarium plants being distributed out of Southern California, posed a threat to previously uncolonized areas. Fish and Wildlife Service and the National Oceanic and Atmospheric Administration, swung into action, bringing in regional networks and state wildlife agencies. The national Aquatic Nuisance Species Task Force, co-chaired by the U.S. Federal scientists confirmed the presence of zebra mussels tucked away in a clump of Aegagropila linnaei, a green alga marketed as moss balls or marimo balls, and issued a warning through the Nonindigenous Aquatic Species Alert System on March 2. Geological Survey that they had seen suspicious mollusks in ornamental aquarium plants that were being offered for sale. A few weeks ago, someone working in a big-box pet store in the Seattle area informed the U.S.
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