Predator-prey relationship between the nemertean Cerebratulus lacteus and the soft-shell clam, Mya arenaria: surface-exploration activity and qualitative observations on feeding behaviour

摘要: The presence of predators at soft-shell clam (Mya arenaria) culture sites is great concern in Atlantic Canada. Laboratory studies were undertaken (i) to monitor the surface-exploration activity nemertean Cerebratulus lacteus obtain a general indication its activities throughout 24-h period, and (ii) describe behaviour while feeding on M. arenaria better understanding predation mechanisms involved. first experiment showed that surface exploration varied significantly according or absence prey. When clams present, C. left burrow all times. In their absence, no observed exploring sediment between 21:00 03:00. Predator density also had an impact activity. second initial encounters prey did not necessarily trigger proboscis eversion. Attacks with proboscis, before consumption started, concentrated ...