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Insect parasitoid species respond to forest structure at different spatial scales

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  • Jens Roland

    (University of Alberta)

  • Philip D. Taylor

    (Acadia University)

Abstract

There is now a solid body of theoretical work1–4 demonstrating that the spatial structure of the habitat combined with animal movement strongly influence host–parasitoid dynamics. The spatial pattern over which parasitoid search takes place can be affected by the distribution of the hosts5, by the spatial arrangement of the host's habitat6 and by the spatial scale at which the parasitoid perceives variation in host abundance7,8. Empirical work, however, has been largely restricted to small-scale field studies of less than one hectare6,9 with very few larger10,11. Here we report initial results of a many-year, large-scale study that is among the first to examine the interaction between a population-level process (parasitism) and anthropogenic forest fragmentation at large and at multiple spatial scales. We demonstrate that parasitism by four species of parasitoids attacking the forest tent caterpillar, Malacosoma disstria, is significantly reduced or enhanced depending on the proportion of forested to unforested land. Each of the parasitoid species responds to this mosaic at four different spatial scales that correspond to their relative body sizes. Our data give empirical support to the argument that changes in landscape structure can alter the normal functioning of ecological processes such as parasitism, with large-scale population consequences3,4.

Suggested Citation

  • Jens Roland & Philip D. Taylor, 1997. "Insect parasitoid species respond to forest structure at different spatial scales," Nature, Nature, vol. 386(6626), pages 710-713, April.
  • Handle: RePEc:nat:nature:v:386:y:1997:i:6626:d:10.1038_386710a0
    DOI: 10.1038/386710a0
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    Cited by:

    1. Stallman, Heidi R. & James, Harvey S., 2015. "Determinants affecting farmers' willingness to cooperate to control pests," Ecological Economics, Elsevier, vol. 117(C), pages 182-192.
    2. Laura E Farrell & Daniel M Levy & Therese Donovan & Ruth Mickey & Alan Howard & Jennifer Vashon & Mark Freeman & Kim Royar & C William Kilpatrick, 2018. "Landscape connectivity for bobcat (Lynx rufus) and lynx (Lynx canadensis) in the Northeastern United States," PLOS ONE, Public Library of Science, vol. 13(3), pages 1-25, March.
    3. Cobbold, Christina A. & Roland, Jens & Lewis, Mark A., 2009. "The impact of parasitoid emergence time on host–parasitoid population dynamics," Theoretical Population Biology, Elsevier, vol. 75(2), pages 201-215.
    4. Babin-Fenske, Jennifer & Anand, Madhur, 2011. "Agent-based simulation of effects of stress on forest tent caterpillar (Malacosoma disstria Hübner) population dynamics," Ecological Modelling, Elsevier, vol. 222(14), pages 2561-2569.
    5. Noel G Hahn & Cesar Rodriguez-Saona & George C Hamilton, 2017. "Characterizing the spatial distribution of brown marmorated stink bug, Halyomorpha halys Stål (Hemiptera: Pentatomidae), populations in peach orchards," PLOS ONE, Public Library of Science, vol. 12(3), pages 1-20, March.

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