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Wiley InterScience | ||||||||||||||
  Ecological EntomologyVolume 22 Issue 1, Pages 97 - 108 Published Online: 30 Oct 2003 Journal compilation © 2010 The Royal Entomological Society
Abstract | Full Text: PDF (Size: 434K) | Related Articles | Citation Tracking  Responses of natural enemies to experimentally increased populations of the forest tent caterpillar, Malacosoma disstria Copyright Blackwell Science Ltd, Edinburgh ABSTRACT1. The responses of predators and parasitoids to increased forest tent caterpillar populations were studied by introducing eggs to two trembling aspen, Populus tremuloides Michx., forests where natural populations were at very low density. 2. Of five parasitoid species recovered, only the braconid Aleiodes malacosomatos (Mason) and the tachinid Patelloa pachypyga (Aldrich & Webber) exhibited spatially density-dependent responses, in dry upland forest and mesic lowland forest, respectively. Forest type restrictions on the abundance of these species and the weak density-dependent response by A. malacosomatos suggests that parasitoids may not be capable of regulating low-density tent caterpillar populations. 3. Predation of final-instar larvae and pupae by birds, in particular the northern oriole, Icterus galbula (L.), virtually eliminated the experimental populations. Avian predation was widespread and dominated mortality at all densities. 4. Implications for the initiation of outbreaks of cyclic defoliators are discussed.
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