Is a healthy ecosystem one that is rich in parasites?

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Abstract

Historically, the role of parasites in ecosystem functioning has been considered trivial because a cursory examination reveals that their relative biomass is low compared with that of other trophic groups. However there is increasing evidence that parasite-mediated effects could be significant: they shape host population dynamics, alter interspecific competition, influence energy flow and appear to be important drivers of biodiversity. Indeed they influence a range of ecosystem functions and have a major effect on the structure of some food webs. Here, we consider the bottom-up and top-down processes of how parasitism influences ecosystem functioning and show that there is evidence that parasites are important for biodiversity and production; thus, we consider a healthy system to be one that is rich in parasite species.

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Hudson, P. J., Dobson, A. P., & Lafferty, K. D. (2006, July). Is a healthy ecosystem one that is rich in parasites? Trends in Ecology and Evolution. https://doi.org/10.1016/j.tree.2006.04.007

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