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Invasive crayfish in the Pacific Northwest

http://pubs.usgs.gov/fs/2011/3132/

These organisms have negative effects on local ecosystems, but we don't yet know how extensively they have spread. Here is a key to help people identify them.

by Pearl, Christopher; McCreary, Brome; and Adams, Michael J.
U.S. Geological Survey Fact Sheet 2011-3132
Related topics:
Biogeography, Crustaceans, Dispersal (organisms), Ecology, Invasive species, Invertebrate zoology, Systematics and taxonomy, Streams
States or counties
Oregon, Washington

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