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The natural exclusion of red deer from large boulder grazing refugia and the consequences for saxicolous bryophyte and lichen ecology

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Abstract

Large boulder grazing refugia permitted comparison of saxicolous bryophyte and lichen assemblages with those boulder tops accessible to red deer (Cervus elaphus) on a sporting estate in northwest Scotland. Plant succession was predicted to occur unchecked by grazing on the tops of these large boulders with cascading effects on bryophytes and lichens—assuming boulders had been in place over the same time period. Fifty pairs of boulders (one ≥2 m and the other accessible to red deer) were selected at random from various locations below north-facing crags. Percentage cover of each bryophyte and lichen species was estimated from three randomly placed quadrats on each boulder top. Due consideration was given to the influence of island biogeography theory in subsequent model simplification. Mean shrub cover and height, leaf-litter, bryophyte cover and bryophyte species richness were significantly higher within quadrats on large boulder tops that naturally excluded red deer. Lichen cover and lichen species richness were significantly higher on boulder tops accessible to red deer. Lichen cover was in a significant negative relationship with bryophyte cover, shrub cover and litter cover. Bryophyte cover showed a significant positive relationship with shrub height but there was an optimum shrub cover. Natural exclusion of red deer from the tops of large boulders has facilitated plant succession. The results suggest that grazing arrests the lithosere on boulder tops accessible to red deer at an early plagioclimax favouring saxicolous lichens. The results are relevant to situations where red deer might be excluded from boulder fields that hold lichen assemblages of conservation value.

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Acknowledgments

We thank the owners of Letterewe Estate for funding this research and for the provision of accommodation. We are also grateful to Brian Coppins for his assistance with identifying some of the more difficult lichen specimens. The comments and suggestions made by the anonymous reviewers on an earlier draft of this manuscript were very much appreciated.

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  1. Department of Biology, Imperial College London, Silwood Park Campus, ASCOT, Berks, SL5 7PY, UK

    Oliver Moore & Michael J. Crawley

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  1. Oliver Moore
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  2. Michael J. Crawley
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Correspondence to Oliver Moore.

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Communicated by T. G. Allan Green.

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Moore, O., Crawley, M.J. The natural exclusion of red deer from large boulder grazing refugia and the consequences for saxicolous bryophyte and lichen ecology. Biodivers Conserv 23, 2305–2319 (2014). https://doi.org/10.1007/s10531-014-0725-3

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  • DOI: https://doi.org/10.1007/s10531-014-0725-3

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