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Data from: Predator community structure and trophic linkage strength to a focal prey

Citation

Lundgren, Jonathan G.; Fergen, Janet K. (2014), Data from: Predator community structure and trophic linkage strength to a focal prey, Dryad, Dataset, https://doi.org/10.5061/dryad.c2n18

Abstract

Predator abundance and community structure can increase or decrease the suppression of lower trophic levels, although studies of these interactions under field conditions are relatively few. We investigated how the frequency of consumption (measured using PCR-based gut analysis) is affected by predator abundance, community diversity and evenness under realistic conditions. Soil arthropod communities in sixteen maize fields were measured (number of predators, diversity [Shannon H], and evenness [J]) and predator guts were searched for DNA of the focal subterranean herbivore, the corn rootworm (Diabrotica virgifera). Predator abundance and diversity were positively correlated with trophic linkage strength (the proportion positive for rootworm DNA), although the latter characteristic was not significantly so. The diversity and evenness of the predator community with chewing mouthparts was strongly correlated with their linkage strength to rootworms, whereas the linkage strength of fluid-feeding predators were unaffected by their community characteristics. Chewing predators are more affected by the rootworm’s hemolymph defense. This research clearly shows that predator abundance and diversity influences the strength of a community’s trophic linkage to a focal pest, and that these community characteristics may be particularly important for less palatable or protected prey species. We also make the case for conserving diverse and abundant predator communities within agroecosystems as a form of pest management.

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