Carcinus Maenas in RI COASTAL WATERS European Green Crab

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GUIDE TO MARINE INVADERS Carcinus maenas IN RI COASTAL WATERS European green crab PHYSICAL DESCRIPTION • 5 lateral spines on each side of carapace (shell) • Color variable: green, reddish orange, or tan carapace with darker mottling • Carapace width up to 3.6 in (7.6 cm) HABITAT PREFERENCE • Occurs in the lower intertidal and nearshore subtidal zones, usually on mud, sand, or pebbles Robert. Buchsbaum • Prefers sheltered areas 5 lateral • Common in salt marshes, spines sandy beaches, and dark mottling rocky shores on carapace • Able to tolerate wide range of salinities (as low as 6 ppt) Carcinus maenas Andrew Martinez Female Carcinus maenas carrying eggs 1 2 3 4 5 6 7 © Rob Gough, DFBW 8 GUIDE TO MARINE INVADERS Carcinus maenas IN RI COASTAL WATERS European green crab INVASION STATUS & ECOLOGICAL CONCERNS Abundant in all nearshore subtidal habitats, Carcinus maenas is native to the North Atlantic coast of Europe and the North African coast. It is believed to have first arrived in eastern North America around 1817, most likely in the dry ballast of cargo ships. The species has since established itself from Delaware to Nova Scotia and is the most common crab species in many locations throughout this range. An omnivorous scavenger, this crab is one of New England’s dominant benthic predators, feeding on clams, oysters, crabs and mollusks. It is often blamed for the collapse of Maine’s soft shell clam industry. SIMILAR SPECIES Hemigrapsus sanguineus Asian shore crab • 3 lateral spines • Banded legs • Carapace more squarely shaped than green crab Salem Sound Coastwatch • Prefers rocks, cobble habitat • Occurs in subtidal and lower intertidal zones European green crab Asian shore crab Carcinus maenas Hemigrapsus sanguineus Non-native Robert Buchsbaum This card is adapted from an original series produced by Salem Sound Coastwatch (www.salemsound.org). The original series was funded by the MA EOEEA Office of Coastal Zone Management with funding from the U.S.F.W.S. For more information please visit www.mass.gov/czm/invasives/monitor/reporting.htm. The production of this adapted card was funded by the RI Coastal Resources Management Council with funding from the U.S. Fish & Wildlife Service. To report findings please email [email protected] or call (401) 783-7772 or (401) 783-3370..

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Carcinus Maenas: a Demographic Study of An
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