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

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