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Is a healthy ecosystem one that is rich in parasites?

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...

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Published in:	Trends in ecology & evolution (Amsterdam) 2006-07, Vol.21 (7), p.381-385
Main Authors:	Hudson, Peter J., Dobson, Andrew P., Lafferty, Kevin D.
Format:	Article
Language:	English
Subjects:	Animal and plant ecology Animal, plant and microbial ecology Animals Biodiversity Biological and medical sciences Ecosystem Evolution, Molecular Food Chain Fundamental and applied biological sciences. Psychology General aspects Health Host-Parasite Interactions - physiology Parasites - physiology Synecology
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creator	Hudson, Peter J. Dobson, Andrew P. Lafferty, Kevin D.
description	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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subjects	Animal and plant ecology Animal, plant and microbial ecology Animals Biodiversity Biological and medical sciences Ecosystem Evolution, Molecular Food Chain Fundamental and applied biological sciences. Psychology General aspects Health Host-Parasite Interactions - physiology Parasites - physiology Synecology
title	Is a healthy ecosystem one that is rich in parasites?
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