Description:
Experimental treatment (either 'CRAB' or 'NO CRAB'). CRAB = The 'Crab' treatment was created by placing a mature male green crab, Carcinus maenas, and 30 adult L. obtusata to serve as food for the crab in the stimulus chamber. NO CRAB = stimulus chambers for the 'No Crab' treatment received just 30 adult L. obtusata