Multi-Trophic Interactions

Photograph of a beetle on chicory flowerMulti-trophic Interactions is a new major research topic in Agroecology that combines existing lines of study at both SCRI and the University of Dundee. Trophic (or feeding) interactions drive the cycling of energy and nutrients in farmland. Insects and other invertebrates feed on plants and in turn are fed on by other insects, spiders, various symbionts, pathogens and vertebrates. A very small proportion of the total species in trophic interactions are pests of agriculture. Most mediate processes that are essential to the cropping cycle, such as the breakdown of dead organisms (crops, weeds, wood, animals), the regulation of pests and the pollination of flowers. These trophic interactions are exceedingly complex and are studied using advanced concepts and methods in organism biology, molecular biology and mathematical modelling.  Through gaining basic knowledge, the topic aims to provide a scientific basis for future management of invertebrate populations in farmland.

Above-ground - below-ground trophic interactions

There is now emerging consensus that above-ground and below-ground compartments are intimately linked, with many examples of spatially separated organisms interacting to shape community dynamics via plant-mediated mechanisms. Research at SCRI aims to gain a mechanistic understanding of the genetic and chemical plant-mediated processes which underpin interactions between organisms that exploit different parts of the plant. By understanding these key processes, we aim to exploit natural resistance mechanisms to herbivore attack and manipulate trophic interactions to manage crop pests and maintain system stability.

We work on several systems including barley, raspberry and brassicas, focusing on how soil-dwelling herbivores (predominantly root-feeding insects) affect above-ground herbivores, their antagonists (for example, parasitoids) and plant pathogens. At present our experimental and modelling research is funded by the Scottish Government, the Natural Environmental Research Council and the Engineering and Physical Sciences Research Council. Examples of our current research include the following.Image of aphids

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