Leafhopper-induced plant resistance enhances predation risk in a phytophagous beetle |
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Authors: | Ian Kaplan Margaret E Lynch Galen P Dively Robert F Denno |
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Institution: | (1) Department of Entomology, University of Maryland, 4112 Plant Sciences Building, College Park, MD 20742, USA |
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Abstract: | Many herbivores elicit biochemical, physiological, or morphological changes in their host plants that render them more resistant
to co-occurring herbivores. Yet, despite the large number of studies that investigate how induced resistance affects herbivore
preference and performance, very few have simultaneously explored the cascading effects of induction on higher trophic levels
and consequences for prey suppression. In our study system, early-season herbivory by leafhoppers elevated plant resistance
to subsequent attack by chrysomelid beetles sharing the same host plant. Notably, beetles feeding on leafhopper-damaged plants
incurred developmental penalties (e.g., prolonged time in early larval instars) that rendered them more susceptible to predation
by natural enemies. As a result, the combined bottom-up effect of leafhopper-induced resistance and the top-down effect of
enhanced predation resulted in the synergistic suppression of beetle populations. These results emphasize that higher trophic
level dynamics should be considered in conjunction with induced resistance to better understand how plants mediate interspecific
interactions in phytophagous insect communities. |
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Keywords: | Plant-mediated interactions Induced plant resistance Interspecific competition Slow-growth-high-mortality hypothesis Tri-trophic interactions |
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