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New Records of Crustaceans (Amphipoda, Isopoda) in the Sacramento/San Joaquin Delta, California, and Application of Criteria for Introduced Species

Jason D. Toft, Jeffery R. Cordell and Wayne C. Fields
Journal of Crustacean Biology
Vol. 22, No. 1 (Feb., 2002), pp. 190-200
Published by: on behalf of The Crustacean Society
Stable URL: http://www.jstor.org/stable/1549620
Page Count: 11
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
New Records of Crustaceans (Amphipoda, Isopoda) in the Sacramento/San Joaquin Delta, California, and Application of Criteria for Introduced Species
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Abstract

The amphipod Crangonyx floridanus and the isopods Caecidotea racovitzai and Asellus hilgendorfii were discovered in the Sacramento/San Joaquin Delta, California, U.S.A. We applied Chapman and Carlton's (1994) criteria for determining introduced species to test whether these species are non-indigenous to the delta. The majority of the attributes scored positive, indicating that these species are non-indigenous. These populations appear to be firmly established, as they occurred at a variety of freshwater wetland habitats throughout a one-year study. The species are briefly described, and distinguished from similar native and non-indigenous species known to exist in the surrounding area.

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