THE TAPEWORM SCHISTOCEPHALUS-SOLIDUS ALTERS THE ACTIVITY AND RESPONSE, BUT NOT THE PREDATION SUSCEPTIBILITY OF INFECTED COPEPODS

Cyclops abyssorum and Cyclops scutifer were experimentally infected wi th procercoids of the cestode Schistocephalus solidus, then examined f or altered behavior and susceptibility to predation, respectively. Inf ected C. abyssorum differed from uninfected controls in their initial response to disturbance and their degree of activity but only when the y harbored procercoids that were potentially infective to the next hos t. To examine the possible consequence of the altered behavior for sus ceptibility to predation, three-spined sticklebacks (Gasterosteus acul eatus) were offered equal numbers of infected and uninfected C. scutif er. Infected copepods were not preyed upon significantly more than con trols.