NDLI: Establishment and dominance of an introduced herbivore has limited impact on native host-parasitoid food webs

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Establishment and dominance of an introduced herbivore has limited impact on native host-parasitoid food webs

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Establishment and dominance of an introduced herbivore has limited impact on native host-parasitoid food webs

Content Provider	Springer Nature Link
Author	Timms, Laura L. Walker, Steven C. Smith, Sandy M.
Copyright Year	2011
Abstract	The gypsy moth is considered one of the most harmful invasive forest insects in North America. It has been suggested that gypsy moth may indirectly impact native caterpillar communities via shared parasitoids. However, the impact of gypsy moth on forest insect food webs in general remains unstudied. Here we assess such potential impacts by surveying forest insect food webs in Ontario, Canada. We systematically collected caterpillars using burlap bands at sites with and without histories of gypsy moth outbreak, and then reared these caterpillars until potential parasitoid emergence. This procedure allowed us to generate quantitative food webs describing caterpillar-parasitoid interactions. We estimated the degree of parasitoid sharing between gypsy moth and native caterpillars. We also statistically modeled the effect of gypsy moth outbreak history and current gypsy moth abundance on standard indices of quantitative food web structure and the diversity of parasitoid communities. Rates of gypsy moth parasitism were very low and gypsy moth shared very few parasitoids with native caterpillars, suggesting limited potential for indirect interactions. We did not detect any significant effects of gypsy moth on either food web structure or parasitoid diversity, and the small amount of parasitoid sharing strongly implies that this lack of significance is not merely due to low statistical power. Our study suggests that gypsy moth has limited impact on native host-parasitoid food webs, at least for species that use burlap bands. Our results emphasize that extrapolations of theoretical and experimental conclusions on the impacts of invasive species should be tested in natural settings.
Starting Page	229
Ending Page	244
Page Count	16
File Format	PDF
ISSN	13873547
Journal	Biological Invasions
Volume Number	14
Issue Number	1
e-ISSN	15731464
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-04-28
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gypsy moth Forest caterpillars Invasive species Parasitoids Indirect interactions Quantitative food webs Plant Sciences Ecology Developmental Biology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Ecology, Evolution, Behavior and Systematics

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Potential interactions between invasive woody shrubs and the gypsy moth (Lymantria dispar), an invasive insect herbivore

Costly leaf shelters protect moth pupae from parasitoids

Vertical canopy gradient shaping the stratification of leaf‐chewer–parasitoid interactions in a temperate forest

Introduced species provide a novel temporal resource that facilitates native predator population growth

Native generalist natural enemies and an introduced specialist parasitoid together control an invasive forest insect (Dataset)

Data from: Vertical canopy gradient shaping the stratification of leaf-chewer-parasitoid interactions in a temperate forest (Dataset)

Plant-phenotypic changes induced by parasitoid ichnoviruses enhance the performance of both unparasitized and parasitized caterpillars (Dataset)

Trophic overlap between native and invasive stream crayfish

Introduced parasites in food webs: new species, shifting structures?

Establishment and dominance of an introduced herbivore has limited impact on native host-parasitoid food webs

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Establishment and dominance of an introduced herbivore has limited impact on native host-parasitoid food webs