Resolution of agonistic conflicts in dyads of acquainted green swordtails (Xiphophorus helleri, Pisces, Poeciliidae): A game with perfect information

摘要: Conflict resolution of familiar opponents was compared to that unfamiliar ones in Xiphophorus helleri males. Under the Familiar condition, two males which met had settled a contest against each other previously staged encounter another aquarium. Thus one opponent dominant pair member, its subordinate. Unfamiliar were not acquainted with but independently undergone previous experience victory or defeat. We tested hypothesis pairs would conform some behaviourial predictions an «asymmetrical game perfect information». As for pairs, being uninformed asymmetries at onset, they have acquire information on these during course interaction («asymmetrical assessment») alternatively persist certain time cost («war attrition»). All expectations derived from information» applied ones. In all prior roles reinstated without any escalation. Though winners predominantly defeated losers under both conditions cognizance, this difference more extreme dyads than This suggests respective less clearly identified latter. The costs conflicts terms aggressive behaviours used and also higher Unacquainted individuals required longer period assess other. addition, rely pugnacious behaviour settle disputes comparison pairs. expected also, already cognizant initial characterized behavioural patterns typical roles. Differences between ultimate clear appeared earlier conflict. It possible discriminate predict using interactions. most unacquainted could be forecasted multivariate discriminant analyses, mainly by their offering «resistance» future losers. A «war attrition» did fit