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Distribution patterns in British and Irish liverworts and hornworts

Preston, Christopher D.; Harrower, Colin A.; Hill, Mark O.. 2011 Distribution patterns in British and Irish liverworts and hornworts. Journal of Bryology, 33 (1). 3-16. 10.1179/1743282010Y.0000000001

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Abstract/Summary

The 300 species of British and Irish liverworts and hornworts are classified into ten groups, based on their recorded presence in 10 × 10 km grid squares (hectads). A two-stage classification initially amalgamated single species into clusters and then systematically removed the smallest clusters, redistributing their species until only ten clusters remained; in the second stage, species were reassigned to the cluster to which they showed the greatest similarity until they all remained stationary. The groups were named after the species with distributions which were most similar to that of the cluster as a whole (Pellia epiphylla, Phaeoceros laevis sens. lat., Cladopodiella fluitans, Lophocolea heterophylla, Scapania undulata, Anastrepta orcadensis, Harpalejeunea molleri, Moerckia blyttii, Scapania degenii, Marsupella condensata). Most groups are nested within at least one other group but the south-eastern L. heterophylla cluster is distinctive. Four groups, Phaeoceros laevis, Cladopodiella fluitans, Scapania degenii and (especially) Marsupella condensata contain a high percentage (30-73) of species which are classed by IUCN criteria as Critically Endangered, Endangered or Vulnerable.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1179/1743282010Y.0000000001
Programmes: CEH Topics & Objectives 2009 onwards > Biodiversity > BD Topic 1 - Observations, Patterns, and Predictions for Biodiversity
CEH Sections: Pywell
ISSN: 0373-6687
Additional Keywords: cluster analysis, hotspots, nested distributions, phytogeography, threat
NORA Subject Terms: Botany
Date made live: 16 May 2011 15:17
URI: http://nora.nerc.ac.uk/id/eprint/14158

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