Response of juvenile rainbow trout to varying concentrations of chemical alarm cue: response thresholds and survival during encounters with predators

摘要: Prey animals may mediate the intensity of their behavioural responses to predators reflect risk predation. However, in absence an overt (observable) response a particular predation-risk cue, we need ask whether or not prey are still using cue assess predation risk. Behavioural that readily observable within time frame experiment considered covert. In this study exposed juvenile rainbow trout, Oncorhynchus mykiss, varying concentrations conspecific chemical alarm determine threshold. subsequent trout alarm-cue above and below behavioural-response threshold allowed them interact with unknown predator (northern pike, Esox lucius). Trout were able evade equally as well respon...