WHAT THE EVIDENCE SAYS
Researchers used dietary DNA metabarcoding to build tri-trophic networks linking birds and bats, spiders and insect pests in apple and blueberry crops. The networks separated birds and bats into different prey modules: bats tended to be more directly connected to pests, while birds more frequently showed intraguild predation on arthropod natural enemies. Among birds in apple orchards, higher abundance increased direct pest predation, whereas greater insectivory favored intraguild predation.
WHY IT MATTERS / OUR READ
Functional labels such as ‘insectivore’ can obscure who is actually eating whom. The management signal is to treat natural pest control as a food-web problem: predator identity, abundance and interaction pathways matter, and combining complementary predator groups may perform differently from simply maximizing predator richness.
CAVEATS / UNCERTAINTY
Diet metabarcoding and network structure show feeding relationships, not realized crop yield, pest suppression or pesticide reduction. Sampling periods and spatial coverage differed among predator groups, and the authors’ management recommendation should be tested against orchard-scale outcomes before being generalized.
SOURCE
Journal of Applied Ecology · Original evidence
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