Reproductive senescence and dynamic oviposition behaviour in insects

We explore the relationship between clutch size behaviour and the likelihoo d of egg limitation in insects with parasitoid-like life histories. We comp are the incidence of egg limitation in insects that produce clutch sizes co nsistent with maximizing fitness per host (i.e. the 'single host maximum', or Lack clutch size) with insects exhibiting two types of dynamic behaviour . In the first case, insects produce clutch sizes according to a rule that specifies a negative relationship between egg complement and clutch size; i n the second case, clutch size is determined by both egg complement and the host encounter rate using a dynamic state-variable model. The analyses are an extension of models presented by Rosenheim (1996), which predicted a st rong positive relationship between the risk of egg limitation and the host encounter rate in the absence of dynamic oviposition behaviour. Our results are consistent with Rosenheim's, but they show that dynamic behaviour can greatly reduce the risk of egg limitation and weaken the relationship betwe en the host encounter rate and egg limitation.