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Parasites: Small Players with Crucial Roles in the Ecological Theater

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Abstract

Effective management of our natural resources requires an understanding of ecosystem structure and function; effectively, an ecosystem-based approach to management. Parasites occur, albeit cryptically, in almost all ecosystems, yet they are usually neglected in studies on populations and communties of organisms. Parasites can have pronounced or subtle effects on hosts affecting host behavior, growth, fecundity, and mortality. Furthermore, parasites may regulate host population dynamics and influence community structure. Many parasites have complex life cycles and depend for transmission on the presence of a variety of invertebrate and vertebrate intermediate hosts. Often transmission involves predator–prey interactions. Thus, parasites reflect the host’s position in the food web and are indicative of changes in ecosystem structure and function. Parasites can provide information on population structure, evolutionary hypotheses, environmental stressors, trophic interactions, biodiversity, and climatic conditions. I use examples from diverse freshwater and marine systems to demonstrate that parasites should be incorporated into research and monitoring programs to maximize information gathered in ecosystem-based studies and resource management.

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Acknowledgments

I thank Drs. Jenny Cook, Peter Daszak, Michael Pietrock, and two reviewers for providing helpful comments on the manuscript. I am grateful to Dr. Frank Morado for the invitation to present the opening address at a special symposium of the American Fisheries Society in Phoenix, Arizona in August 2001, upon which this work is based.

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  1. St. Lawrence Centre, Environment Canada, 105 McGill, 7th Floor, Montreal, Quebec, Canada, H2Y 2E7

    D.J. Marcogliese

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Marcogliese, D. Parasites: Small Players with Crucial Roles in the Ecological Theater. EcoHealth 1, 151–164 (2004). https://doi.org/10.1007/s10393-004-0028-3

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