Evolutionary Processes Affecting Adaptation to Saprotrophic Life Styles in Ascomycete Populations

  • A. D. M. Rayner
Part of the NATO ASI Series book series (NSSA, volume 269)


An understanding of sources of phenotypic variation in natural ascomycete populations is critical to the evaluation of criteria for taxonomic delimitation. Such variation may reflect genetic differences between individuals due to mutational and recombinatorial processes, or result from epigenetic changes in developmental patterns within heterogeneous habitats.

Amongst saprotrophic fungi, the degree to which an organism is adapted to colonization of disturbed or undisturbed habitats may influence its breeding biology and somatic development. Disturbance imposes R-selection, favouring organisms that are quick to arrive at newly available domains and to exploit readily assimilable resources, hence reducing genetic and epigenetic variation. Organisms that colonize undisturbed habitats are S- or C-selected, being able respectively to survive selectively stressful conditions or a potentially high incidence of competitors; they tend to exhibit both genetic and epigenetic variation.

Patterns of variation amongst ascomycete populations and individuals are discussed in relation to environmental heterogeneity and compared with those exhibited by basidiomycetes. Possible mechanisms resulting in phenotypic instability are introduced, and the basis for general differences between ascomycetes and basidiomycetes.


Fungal Community Saprotrophic Fungus Mycological Research British Mycological Society Undisturbed Habitat 
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Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • A. D. M. Rayner
    • 1
  1. 1.School of Biology and BiochemistryUniversity of BathBathUK

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