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Ectomycorrhizas associated with a relict population of Dryas octopetala in the Burren, western Ireland. I. Distribution of ectomycorrhizas in relation to vegetation and soil characteristics

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Abstract

The distribution of ectomycorrhizas on Dryas octopetala L in grass heaths of the 450 km2 karst region known as the Burren in Western Ireland was examined in relation to soil factors and vegetation type. Ectomycorrhizas were identified or characterised from 56 soil cores from 30 sites, and the occurrence of each ectomycorrhizal (EM) type was quantified by estimating the total length of mycorrhizal tips of each type. Soil organic matter, total nitrogen, extractable phosphorus, pH and depth were the soil factors determined. In total, 24 EM types were recorded. The EM community of Dryas roots was significantly more species-rich in one vegetation type—Hyperico-Dryadetum—than in others (Arctostaphylo-Dryadetum or Asperulo-Seslerietum). Multiple linear regression analyses indicated that soil organic matter and soil depth explained a significant portion of the variation in EM abundance, while soil organic matter and extractable phosphorus explained a significant portion of the variation in EM diversity. Canonical correspondence analysis showed that some individual EM types (e.g. Craterellus lutescens, Cenococcum geophilum, Tomentella sp., Boletus sp.) exhibited distinct soil preferences, most markedly in relation to soil organic matter, which, in this analysis, was the main significant soil variable distinguishing the three vegetation types.

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Acknowledgements

The assistance and advice of Andy Taylor, Anna Rosling and Roger Finlay (Department of Forest Mycology and Pathology, Swedish University of Agricultural Sciences, Uppsala, Sweden) are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Life Sciences, University of Limerick, Limerick, Ireland

    Thomas J. Harrington

  2. Department of Botany, University College Dublin, Dublin, Ireland

    Derek T. Mitchell

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  1. Thomas J. Harrington
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  2. Derek T. Mitchell
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Correspondence to Thomas J. Harrington.

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Harrington, T.J., Mitchell, D.T. Ectomycorrhizas associated with a relict population of Dryas octopetala in the Burren, western Ireland. I. Distribution of ectomycorrhizas in relation to vegetation and soil characteristics. Mycorrhiza 15, 425–433 (2005). https://doi.org/10.1007/s00572-005-0347-4

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