Climatic Unpredictability and Parasitism Of Caterpillars: Implications of Global WarmingProceedings of the National Academy of Sciences of the United State of America
Document TypeConference Proceeding
AbstractInsect outbreaks are expected to increase in frequency and intensity with projected changes in global climate through direct effects of climate change on insect populations and through disruption of community interactions. Although there is much concern about mean changes in global climate, the impact of climatic variability itself on species interactions has been little explored. Here, we compare caterpillar–parasitoid interactions across a broad gradient of climatic variability and find that the combined data in 15 geographically dispersed databases show a decrease in levels of parasitism as climatic variability increases. The dominant contribution to this pattern by relatively specialized parasitoid wasps suggests that climatic variability impairs the ability of parasitoids to track host populations. Given the important role of parasitoids in regulating insect herbivore populations in natural and managed systems, we predict an increase in the frequency and intensity of herbivore outbreaks through a disruption of enemy–herbivore dynamics as climates become more variable.
Citation InformationJohn O. Stireman, Lee A. Dyer, D. H. Janzen, M. S. Singer, et al.. "Climatic Unpredictability and Parasitism Of Caterpillars: Implications of Global Warming" Proceedings of the National Academy of Sciences of the United State of America Vol. 102 Iss. 48 (2005) p. 17384 - 17387 ISSN: 1091-6490
Available at: http://works.bepress.com/john_stireman/12/