Effect of pollen supplement on intraguild predatory interactions between two omnivores: The importance of spatial dynamics

Sulochana Shakya, Phyllis G. Weintraub, Moshe Coll*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Arthropods often engage in complex trophic interactions such as intraguild predation (IGP), true omnivory (i.e., feeding on plants and prey), and apparent competition. Theoretical treatments of the effects of such interactions on herbivore populations have been concerned almost entirely with equilibrium conditions. Yet these interactions are common in non-equilibrium settings such as agroecosystems, where they are likely to have a strong influence on pest populations. We therefore tested short-term effects of IGP and food supplementation on interactions between two predators (the phytoseiid mite Neoseiulus cucumeris and the anthocorid bug Orius laevigatus) and their shared prey, Frankliniella occidentalis, on strawberry plants. All three consumers feed on strawberry pollen, both mites and bugs prey on thrips, and the bug also feeds on the mites (IGP). Strong IGP on mites (IG prey) by the bugs (IG predator) was recorded in structurally-simple arenas. In a more complex setting (whole-plants), however, the intensity of IGP differed among plant structures. Likewise, pollen supplementation reduced both IGP and predation on thrips in a structurally simple setting. In the whole-plant experiment, IGP was more intense on pollen-bearing than pollen-free flowers. The study illustrated how spatial dynamics, generated when consumers track food sources differently in the habitat and possibly when herbivorous and IG prey alter their distribution to escape predation, led to site-specific configuration of interacting populations. The intensity of resulting trophic interactions was weakened by food supplementation and by increased complexity of the habitat.

Original languageAmerican English
Pages (from-to)281-287
Number of pages7
JournalBiological Control
Volume50
Issue number3
DOIs
StatePublished - Sep 2009

Bibliographical note

Funding Information:
The authors thank Jay Rosenheim and two reviewers for their insightful comments on the manuscript, and Ruth Yonah for help with manuscript preparation. The study was supported in parts by CRAFT Project QLK5-CT-2001-70484 (BIOPROTECT) from the European Community (to M.C.).

Keywords

  • Frankliniella occidentalis
  • Intraguild predation
  • Neoseiulus cucumeris
  • Omnivory
  • Orius laevigatus
  • Pollen subsidies
  • Resource supplementation
  • Strawberry

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