Author:
Berg K. von,Traugott M.,Symondson W.O.C.,Scheu S.
Abstract
AbstractThe effects of predators on prey populations can be modified by a number of abiotic factors. Here, we investigated the combined and separate effects of rain and ground-dwelling predators on aphid populations in a microcosm experiment lasting for 21 days, using PCR to analyse the gut content of the predators. Rain significantly dislodged aphids from shoots and ears by 57% and 25%, respectively. The gut content analysis showed that more predators consumed aphids in the rain treatment than without rain, indicating higher availability of aphids to ground-dwelling predators after rain. However, no synergistic effects of rain and ground-dwelling predators on aphid population development could be demonstrated. Rain alone significantly decreased aphid populations by 27%, suggesting that this is a significant mortality factor. Predators alone had no significant effect on aphid numbers, but the gut content analyses showed aphid consumption also in the no-rain treatments, indicating that aphids were available to the predators on the soil surface even without rain. Our results suggest that weather conditions such as rain can modify predator-prey interactions in the field. Employing PCR-based predator gut content analyses proved to be useful as trophic links could be directly verified.
Publisher
Cambridge University Press (CUP)
Subject
Insect Science,Agronomy and Crop Science,General Medicine
Reference41 articles.
1. Behavioral aspects of staphylinid beetles that limit their aphid feeding potential in cereal crops;Dennis;Pedobiologia,1994
2. The development rate of Metopolophium dirhodum (Walker) (Hemiptera: Aphididae) on winter wheat
3. Can Generalist Predators be Effective Biocontrol Agents?
4. Pest control by a community of natural enemies;Sunderland;Acta Jutlandica,1997
5. Watson S.J. (1983) Effects of weather on the number of cereal aphids. PhD thesis, University of East Anglia, Norwich, UK.
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