Morph frequency in British Cepaea nemoralis: What has changed in half a century?

Laurence M. Cook

    Research output: Contribution to journalArticlepeer-review


    The Evolution Megalab database of Cepaea nemoralis provides shell morph frequencies in sets of samples collected from throughout the geographical range during the mid-20th and early 21st centuries. Using data from Britain only, historic and recent samples from woodland, hedgerow and grassland habitats, compared over different geographical distances apart, have been examined for change in frequency with time. There is evidence of changes in mean morph frequency over the last half century in some but not all habitats. Yellow and mid-banded morphs have increased in woodland, unbanded and mid-banded have increased in hedgerow habitats, while for grassland there were too few samples to draw a conclusion. Early and late samples are rarely situated very close to each other. Pairings over longer distances produce larger datasets but their value declines as they are increasingly influenced by factors associated with metapopulation structure; the maximum usable distance is not more than a few km. © 2013 © The Author 2013. Published by Oxford University Press on behalf of The Malacological Society of London, all rights reserved.
    Original languageEnglish
    Pages (from-to)43-46
    Number of pages3
    JournalJournal of Molluscan Studies
    Issue number1
    Publication statusPublished - Feb 2014


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