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Three-trophic-level interactions in cattail hybrid zones

Oecologia volume 105, pages 258–265 (1996)Cite this article

Abstract

Plant-herbivore and herbivore-parasitoid wasp interactions were examined in three hybrid zones of the cattails Typha latifolia and T. angustifolia in south-eastern Michigan over a 2-year period. Patterns of resource use by two lepidopteran species of seed-eating herbivores were studied and herbivore densities sustained by the hybrid cattail T. x glauca and its parental species were determined. Densities of the commoner seed-eating lepidopteran, Lymnaecia phragmitella, were found to be highest in seed heads of both parental species and lowest in hybrid seed heads in zones of hybridization, thus supporting the hybrid resistance hypothesis of Fritz et al. (1994). Densities of the second herbivore, Dicymolomia julianalis, on the hybrid were lower than on the parental T. latifolia, but did not differ from the mean of the combined herbivore densities of the two parental species. D. julianalis in cattails appears to fit the additive hypothesis (Fritz et al. 1994). Parasitism of L. phragmitella by four species of parasitoid wasp, Itoplectis conquisitor (Ichneumonidae), Scambus hispae (Ichneumonidae), Macrocentrus delicatus (Braconidae), and Temelucha gracilipes (Ichneumonidae), was studied to determine if rates of parasitization by these natural enemics on the different cattails were similar to the patterns of plant exploitation exhibited by their hosts. Parasitism rates of L. phragmitella were significantly higher in larvae reared on hybrid cattails. This study reveals two different patterns of hybrid utilization by two very similar herbivores. Opposite patterns of plant utilization were found for the parasitoids compared with their host (L. phragmitella) in cattail hybrid zones.

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  1. Department of Biology, Eastern Michigan University, 48197, Ypsilanti, MI, USA

    Jamin Eisenbach

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  1. Jamin Eisenbach
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Eisenbach, J. Three-trophic-level interactions in cattail hybrid zones. Oecologia 105, 258–265 (1996). https://doi.org/10.1007/BF00328555

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  • DOI: https://doi.org/10.1007/BF00328555

Key words

  • Plant hybridization
  • Three-trophic-level interactions
  • Herbivores
  • Parasitoids
  • Typha