Microbial mutualists and biodiversity in ecosystems

doi:10.1017/CBO9780511736551.025

Chapter Twenty - Microbial mutualists and biodiversity in ecosystems

Published online by Cambridge University Press: 05 February 2013

Jennifer A. Rudgers and

Edited by

Oswald Schmitz and

Jennifer A. Rudgers: Affiliation:
Department of Biology, University of New Mexico
Keith Clay: Affiliation:
Department of Biology, Indiana University
Takayuki Ohgushi: Affiliation:
Kyoto University, Japan
Oswald Schmitz: Affiliation:
Yale University, Connecticut
Robert D. Holt: Affiliation:
University of Florida

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Summary

Defining and detecting microbial trait-mediated indirect interactions

Microbial trait-mediated indirect interactions (TMIIs) occur when a microbe (species A) changes a trait of its host species (species B) that consequently affects another species in the community (species C, or the enemy of the host in a protection mutualism). This trait-mediated effect is distinguished from a density-mediated effect, in which the impact of the microbe would spread to other species exclusively through changes in the density of the host organism (e.g., via increased host mortality caused by a pathogen, density-mediated indirect interactions, DMII). Importantly, models reveal that TMIIs have different dynamical consequences than DMIIs (Chapter 1), thus it is important to distinguish between these effects.

Food web diagrams can bring clarity to the characterization of TMIIs. In contrast to typical predator–prey interactions, microbially-mediated protection mutualisms can involve a microbial partner at the same, or very similar, trophic level as the host organism (Fig. 20.1). Furthermore, symbioses involve the exchange of resources, for example photosynthetic carbon exchanged for soil nutrients in the symbiosis between plants and mycorrhizal fungi; this exchange is depicted explicitly in our diagrams, which include trait-mediated effects that are transmitted to a responding resource species (Fig. 20.1e) or to a consumer species (Fig. 20.1f).

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Type: Chapter
Information: Trait-Mediated Indirect Interactions
Ecological and Evolutionary Perspectives
, pp. 391 - 413
DOI: https://doi.org/10.1017/CBO9780511736551.025 [Opens in a new window]
Publisher: Cambridge University Press
Print publication year: 2012

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