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Shell Shape Variation in Littorina Saxatilis and L. Arcana: A Case of Character Displacement?

Published online by Cambridge University Press:  11 May 2009

J. Grahame  and
P.J. Mill
J. Grahame
Affiliation:
Department of Pure and Applied Biology, University of Leeds, Leeds, LS2 9JT
P.J. Mill
Affiliation:
Department of Pure and Applied Biology, University of Leeds, Leeds, LS2 9JT
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Extract

It is now well established that there are several species in the group of rough periwinkles inhabiting European rocky shores. The usual consensus agrees on four, namely Littorina saxatilis (Olivi), Littorina arcana Ellis, Littorina nigrolineata Gray and Littorina neglecta Bean. The first two species are particularly difficult to distinguish in the field and have received much attention. Recent work indicates that the ovoviviparous L.saxatilis is a very variable species living in a wide range of habitats (e.g. Janson, 1985) and that, although it is close to the oviparous L. arcana in shell morphology and in genotype, the two are separate species (Ward & Warwick, 1980; Ward & Janson, 1985), and not reproductive morphs of the same species.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 69 , Issue 4 , November 1989 , pp. 837 - 855
Copyright
Copyright © Marine Biological Association of the United Kingdom 1989

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