Assessment of energy reserves by damselflies engaged in aerial contests for mating territories

摘要: Abstract Abstract. Male Calopteryx maculata (Odonata) damselflies engage in prolonged, highly escalated aerial contests for mating territories. A previous study (Marden & Waage 1990, Anim. Behav. , 39, 954-959) found that winners of had a higher fat content than losers 88% cases, whereas differences physical variables related to size and flight ability were not the outcome contests. Here is extended order determine whether proceed until one contestant reaches lower limit reserve, or alternatively, contestants are able assess each other's reserves thereby settle before limits reached. The limitation hypothesis was supported, as showed no reduction variability relative winners. assessment supported by an increase accuracy 'fatter wins' rule with increasing contest duration. Winners fatter 17 25 (68%) short (duration 500 s), which suggests gradual accumulation information during further negative relationship between duration energetic asymmetry long Duration also positively total two contestants, perceive status may vary depending on absolute levels energy reserves. model assumes asymptotic performance (i.e. Michaelis-Menten 'saturation' kinetics) proposed explain simultaneous effects duration, examine possible mechanisms use