Dual-guild herbivory disrupts predator-prey interactions in the field

Ecology
Carmen K BlubaughWilliam E Snyder

Abstract

Plant defenses often mediate whether competing chewing and sucking herbivores indirectly benefit or harm one another. Dual-guild herbivory also can muddle plant signals used by specialist natural enemies to locate prey, further complicating the net impact of herbivore-herbivore interactions in naturally diverse settings. While dual-guild herbivore communities are common in nature, consequences for top-down processes are unclear, as chemically mediated tri-trophic interactions are rarely evaluated in field environments. Combining observational and experimental approaches in the open field, we test a prediction that chewing herbivores interfere with top-down suppression of phloem feeders on Brassica oleracea across broad landscapes. In a two-year survey of 52 working farm sites, we found that parasitoid and aphid densities on broccoli plants positively correlated at farms where aphids and caterpillars rarely co-occurred, but this relationship disappeared at farms where caterpillars commonly co-occurred. In a follow-up experiment, we compared single and dual-guild herbivore communities at four local farm sites and found that caterpillars (P. rapae) caused a 30% reduction in aphid parasitism (primarily by Diaeretiella rapae), and i...Continue Reading

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Citations

Oct 22, 2019·Ecology Letters·Luis Abdala-RobertsChrister Björkman
Sep 21, 2018·Frontiers in Plant Science·Carmen K BlubaughWilliam E Snyder
Sep 26, 2019·Environmental Entomology·Karol L KreyWilliam E Snyder
Jan 29, 2021·Journal of Chemical Ecology·Lucille T S ChrétienDani Lucas-Barbosa

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