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6 - Mycelial responses in heterogeneous environments: parallels with macroorganisms

from II - Functional ecology of saprotrophic fungi

Published online by Cambridge University Press:  03 November 2009

By
Lynne Boddy  and
T. Hefin Jones
Edited by
Geoffrey Gadd ,
Sarah C. Watkinson  and
Paul S. Dyer
Lynne Boddy
Affiliation:
Cardiff School of Biosciences, Cardiff University
T. Hefin Jones
Affiliation:
Cardiff School of Biosciences, Cardiff University
Geoffrey Gadd
Affiliation:
University of Dundee
Sarah C. Watkinson
Affiliation:
University of Oxford
Paul S. Dyer
Affiliation:
University of Nottingham
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Summary

Introduction

Terrestrial fungi are commonly studied in the laboratory, growing on artificial media in which nutrients are typically homogeneously distributed and supplied in superabundance, the environment is sterile and microclimate (temperature, moisture, gaseous regime) usually relatively constant. This contrasts with the natural environment, in which: nutrients are often patchily and sparsely distributed or not readily available, because they are locked in recalcitrant material (e.g. lignin); many other organisms are encountered, including other fungi, bacteria and invertebrates; and microclimate is constantly changing, both temporally and spatially. This chapter explores the ways in which fungi cope with environmental heterogeneity. Similar situations are faced by macroorganisms and analogies are drawn. Emphasis is placed on basidiomycetes, not only because they have been studied in most detail, but because of their dominant role as decomposers and mutualistic symbionts (Boddy & Watkinson, 1995; Smith & Read, 1997) and because they are better adapted to respond to environmental heterogeneity over scales ranging from micrometres to many metres than are other fungi.

Both saprotrophic and ectomycorrhizal Basidiomycota form extensive mycelial systems in woodland soil and litter, but it is the former that are the focus of this review. Saprotrophic, cord-forming Basidiomycota that ramify at the soil–litter interface, interconnecting disparate litter components, provide most examples. The key feature of these fungi that fits them for growth in environments where resources are heterogeneously distributed is that they are non-resource-unit restricted, i.e. they can grow out of one resource in search of others.

Type
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Fungi in the Environment , pp. 112 - 140
Publisher: Cambridge University Press
Print publication year: 2007

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