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Invasive Crabs in Puget Sound - Coggle Diagram
Invasive Crabs in Puget Sound
European Green Crab
effects on local wildlife:
disrupt sediment (eelgrass) "actively disturb bed sediments, leading to the loss of ...eelgrass...essential habitat for dungeness crab and pacific salmon (usgs.gov)
dungeness crab population
do they outcompete the native species?
feeds on: clams, oysters, mussels, marine worms, small crustaceans, juvenile crabs and shellfish too. (wsg.washington.edu)
is a host to a marine worm that harms health of local shorebirds (wsg.washington.edu)
origin
the crabs are from northeast Atlantic OCean and Baltic Sea. from northern Africa to norway & iceland. (wsg.washington.edu)
were first brought to San Francisco bay in 1989 and were seen in the west coast of vancouver in 1998 and 1999. they crabs did very well in vancouver and then expanded into the Sooke Inlet. (wsg.washington.edu)
habitat and impacts
what are some of the native species? (affected by the invasive crabs)
shorebirds (because of worm mentioned on wsg.washington.edu)
dungeness crab, oyster, clam
where are they in the puget sound region?
salish sea (wsg.washington.edu/crabteam/greencrab)
dungeness bay, sequim bay, discovery bay, seabeck, fidalgo bay, padilla bay, samish bay, chuckanut bay, lummi bay, drayton harbor (wsg.washington.edu/2022-egc-inland-sites/)
chinese mitten crab
not confirmed in WA, but expectedd to arrive in a way similar to the Green crabs
Path of the European green crabs (Crab Team)
san francisco bay 1989 (crabteam unknown date)
northward, spotted in Willapa Bay and Grays Harbor, WA in 1998
Vancouver Island 1999
Wescott Bay on San Juan Island 2016
Padilla Bay 2016