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Parasites in food webs: the ultimate missing links

June 1, 2008

Parasitism is the most common consumer strategy among organisms, yet only recently has there been a call for the inclusion of infectious disease agents in food webs. The value of this effort hinges on whether parasites affect food-web properties. Increasing evidence suggests that parasites have the potential to uniquely alter food-web topology in terms of chain length, connectance and robustness. In addition, parasites might affect food-web stability, interaction strength and energy flow. Food-web structure also affects infectious disease dynamics because parasites depend on the ecological networks in which they live. Empirically, incorporating parasites into food webs is straightforward. We may start with existing food webs and add parasites as nodes, or we may try to build food webs around systems for which we already have a good understanding of infectious processes. In the future, perhaps researchers will add parasites while they construct food webs. Less clear is how food-web theory can accommodate parasites. This is a deep and central problem in theoretical biology and applied mathematics. For instance, is representing parasites with complex life cycles as a single node equivalent to representing other species with ontogenetic niche shifts as a single node? Can parasitism fit into fundamental frameworks such as the niche model? Can we integrate infectious disease models into the emerging field of dynamic food-web modelling? Future progress will benefit from interdisciplinary collaborations between ecologists and infectious disease biologists.

Publication Year 2008
Title Parasites in food webs: the ultimate missing links
DOI 10.1111/j.1461-0248.2008.01174.x
Authors Kevin D. Lafferty, Stefano Allesina, Matias Arim, Cherie J. Briggs, Giulio A. De Leo, Andrew P. Dobson, Jennifer A. Dunne, Pieter T.J. Johnson, Armand M. Kuris, David J. Marcogliese, Neo D. Martinez, Jane Memmott, Pablo A. Marquet, John P. McLaughlin, Eerin A. Mordecai, Mercedes Pascual, Robert Poulin, David W. Thieltges
Publication Type Article
Publication Subtype Journal Article
Series Title Ecology Letters
Index ID 70177682
Record Source USGS Publications Warehouse
USGS Organization Western Ecological Research Center