Abstract
Predicting the direct and indirect effects of natural enemies on herbivorous insects in species-rich, highly connected arthropod food webs can be extremely difficult. Community ecologists developed the keystone species concept to help simplify this task. Keystone species are species that have disproportionately large effects on the abundance of many interacting species in a community. Keystone species, however, can be difficult to identify in some communities and the effect of species that seem to play key roles in community dynamics often vary dramatically in both space and time. In some communities, pairwise interactions among species may alter the community-wide effect of a species such that it functions as a keystone species. In this chapter, we term this a ‘keystone interaction’ and explore the possibility that mutualisms involving ants and honeydew-producing Hemipterans may alter the abundance and distribution of many species in a predictable manner via increased ant predation in the presence of Hemipterans. Mutualisms involving ants and honeydew-producing insects are incredibly widespread in terrestrial ecosystems and may alter the structure of entire arthropod communities. We review cases where these mutualisms result in interference of biological control via intraguild predation of important biological control agents as well as cases where ant mutualisms result in enhanced biological control via intensified ant predation of important plant-damaging herbivores. In addition, we report the results of our own work involving the ecological consequences of fire ant-aphid mutualisms. We conclude that ant-Hemiptera mutualisms rarely disrupt biological, but instead these mutualisms often increase the effectiveness of ants as biological control agents via the removal of insect herbivores that are more important pests than the Hemipterans that benefit from ant mutualisms.
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Eubanks, M.D., Styrsky, J.D. (2006). Ant-Hemipteran Mutualisms: Keystone Interactions that Alter Food Web Dynamics and Influence Plant Fitness. In: Brodeur, J., Boivin, G. (eds) Trophic and Guild in Biological Interactions Control. Progress in Biological Control, vol 3. Springer, Dordrecht. https://doi.org/10.1007/1-4020-4767-3_8
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