Journal of Applied Entomology (2019) 143, 380-386

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Arran Greenop, Andreas Cecelja, Ben A. Woodcock, Andrew Wilby, Samantha M. Cook and Richard F. Pywell (2019)
Two common invertebrate predators show varying predation responses to different types of sentinel prey
Journal of Applied Entomology 143 (4), 380-386
Abstract: Sentinel prey (an artificially manipulated patch of prey) are widely used to assess the level of predation provided by natural enemies in agricultural systems. Whilst a number of different methodologies are currently in use, little is known about how arthropod predators respond to artificially manipulated sentinel prey in comparison with predation on free-living prey populations. We assessed how attack rates on immobilized (aphids stuck to cards) and artificial (plasticine lepidopteran larvae mimics) sentinel prey differed to predation on free-moving live prey (aphids). Predation was assessed in response to density of the common invertebrate predators, a foliar-active ladybird Harmonia axyridis (Coleoptera: Coccinellidae), and a ground-active beetle Pterostichus madidus (Coleoptera: Carabidae). Significant increases in attack rates were found for the immobilized and artificial prey between the low and high predator density treatments. However, an increased predator density did not significantly reduce numbers of free-living live aphids included in the mesocosms in addition to the alternate prey. We also found no signs of predation on the artificial prey by the predator H. axyridis. These findings suggest that if our assessment of predation had been based solely on the foliar artificial prey, then no increase in predation would have been found in response to increased predator density. Our results demonstrate that predators differentially respond to sentinel prey items which could affect the level of predation recorded where target pest species are not being used.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Samantha M. Cook

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Harmonia axyridis (predator)
Pterostichus madidus (predator)