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Strongylocentrotus droebachiensis
''Strongylocentrotus droebachiensis'' is commonly known as the green sea urchin because of its characteristic green color. It is commonly found in northern waters all around the world including both the Pacific and Atlantic Oceans to a northerly latitude of 81 degrees and as far south as the Puget Sound (Washington State) and England. The average adult size is around , but it has been recorded at a diameter of . The green sea urchin prefers to eat seaweeds but will eat other organisms. They are eaten by a variety of predators, including sea stars, crabs, large fish, mammals, birds, and humans.
==Habitat==
''Strongylocentrotus droebachiensis'' is found on rocky substratum in the intertidal and up to depths of . It uses its strong Aristotle's lantern to burrow into rock, and then can widen its home with the spines. Usually, this sea urchin can leave its hole to find food and then return, but sometimes it creates a hole that gets bigger as it gets deeper, so that the opening is too small for ''S. droebachiensis'' to get out. ''S. droebachiensis'' is a euryhaline species, and can survive in waters of low salinity. This allows it to flourish in the south Puget Sound. Acclimation and size are important factors as larger individuals have a lower surface area to volume ratio and can handle the increased osmotic tension.〔Campbell, J., and M.P. Russel. 2003. Acclimation and growth response of the green sea urchin Strongylocentrotus droebachiensis to flucuating salinity. ''Proceedings of the InternationalConference on Sea Urchin Fisheries and Acuaculture'', pp. 110-117. DEStech Publications, Inc.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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