Biogenic amines influence aggressiveness in crayfish but not their force or hierarchical rank

摘要: This study aimed at understanding the influence of biogenic amines on agonistic behaviour crayfish Procambarus clarkii, a model organism for crustacean decapods. Specifically, we investigated whether hierarchical rank fighting individuals might be altered by injecting solutions either serotonin or octopamine into their haemolymph. First, assessed effect and duration bioamines behaviour, posture, chelar force 60 adult males paired size. Then, examined potential to modify dominance hierarchies observing, 2 h after treatment, three categories familiar size-matched pairs: (1) 20 ‘control pairs’ (both injected with physiological solution), (2) ‘reinforced (the dominant individual, alpha, serotonin, subordinate beta, octopamine), (3) ‘inverted (alpha beta serotonin). The results clearly show that two were able alter posture aggressiveness treated in opposite directions without affecting force. However, large majority retained former position hierarchy. role intrinsic characteristics prior social experience play maintaining is discussed.