Status and Trends

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Marine

Bays, Deltas & Estuaries Intertidal/Coastline

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Invasives

Terrestrial

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Crustaceans+Aquatic+Marine
Crustaceans are found in marine, brackish and fresh waters and are comprised of a large number of arthropods, which includes a various number of animals such as lobsters, crabs, shrimp, crayfish and barnacles. Crustaceans usually have hard shells (exoskeleton) and segmented bodies with pairs of jointed appendages. There are least 77 species of crustaceans that are considered nonindigenous to the waters in which they occur. Out of these 77 species, 44 have become established in their new environment.

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Asian shore crab, Japanese shore crab, Pacific crab, Hemigrapsus sanguineus (De Haan) (Arthropoda: Grapsidae)

Publisher: USGS | Science Center: Florida Integrated Science Center (FISC, Gainesville) | Format: URL

fl.biology.usgs.gov — This webpage is a species profile and nonindigenous species information bulletin of the Asian shore crab, Japanese shore crab, Pacific crab, Hemigrapsus sanguineus (De Haan)(Arthropoda: Grapsidae), with information on its identification and native range, life history, habitat, nonindigenous occurrences, means of introduction, its environmental More...

Using Parasites to Monitor Ecosystem Health

Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL

www.werc.usgs.gov — Parasites can play a positive role in ecosystems. The USGS Western Ecological Research Center is working with the Channel Islands National Park in California to better understand how bacterial epidemics can protect kelp forests from overgrazing by sea urchins and how parasitic castrators might be used against invasive crabs. Researchers will More...