Arthropod-Plant Interactions

, Volume 7, Issue 4, pp 445–453

Costly leaf shelters protect moth pupae from parasitoids

Original Paper

Abstract

Many caterpillars construct shelters by folding leaves and feeding from within. Many shelter-constructing species suffer high rates of parasitism as larvae or pupae. In spite of the likely significance, the effects of these shelters on the survival of pupae and the trade-off between feeding and constructing shelters have attracted little experimental attention. In both field and laboratory experiments, fern-feeding caterpillars [Herpetogramma theseusalis (Walker) (Lepidoptera: Crambidae)] invested heavily in shelters, losing weight and significantly delaying pupation rather than feeding or pupating in exposed locations. Experimentally thinning the walls of shelters in the field doubled the parasitism rate. Parasitism of pupae exceeded predation by an order of magnitude or more in both seasons of this study. Caterpillars constructed similarly sized shelters regardless of availability of fern fronds, resulting in incomplete shelters on especially small fronds, putting pupae at increased risk of parasitism. We suggest that similar interactions are common and merit more attention.

Keywords

Leaf shelters Host–parasitoid interactions Indirect interactions Caterpillars Pupae 

Supplementary material

Supplementary material 1 (MPG 5958 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Graduate Group in Ecology, Department of Entomology and Center for Population BiologyUniversity of California, DavisDavisUSA
  2. 2.Department of Ecology and Evolutionary BiologyBrown UniversityProvidenceUSA

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