Two common invertebrate predators show varying predation responses to different types of sentinel prey

Greenop, Arran and Cecelja, Andreas and Woodcock, Ben A. and Wilby, Andrew and Cook, Samantha and Pywell, Richard F. (2019) Two common invertebrate predators show varying predation responses to different types of sentinel prey. Journal of Applied Entomology, 143 (4). pp. 380-386. ISSN 0931-2048

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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.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Applied Entomology
Additional Information:
This is the peer reviewed version of the following article:Greenop, A, Cecelja, A, Woodcock, BA, Wilby, A, Cook, SM, Pywell, RF. Two common invertebrate predators show varying predation responses to different types of sentinel prey. J Appl Entomol. 2019; 00: 1– 7. https://doi.org/10.1111/jen.12612 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/jen.12612 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1100/1102
Subjects:
ID Code:
130674
Deposited By:
Deposited On:
05 Feb 2019 15:05
Refereed?:
Yes
Published?:
Published
Last Modified:
30 May 2020 06:39