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Intra-Population Variation of the Shell of Littorina rudis (Maton) (Mollusca: Prosobranchia)
Van Marion, P. (1981). Intra-Population Variation of the Shell of Littorina rudis (Maton) (Mollusca: Prosobranchia). J. Moll. Stud. 47(1): 99-107
In: Journal of Molluscan Studies. Oxford University Press: Reading. ISSN 0260-1230, more
Peer reviewed article  

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Keywords
    Environmental factors; Population characteristics; Shells; Littorina rudis (Maton, 1797) [WoRMS]; Marine

Author  Top 
  • Van Marion, P.

Abstract
    Shell variation within a single population of L. rudis , collected near the Biological Station at Trondheim, Norway, was studied. The variation of the shell features studied, which included the shape of the basal part of the outer lip, and the relative height of the spire, width of the shell and of the aperture, were found to be at least partially related to shell height. Furthermore, the shell shape in the population investigated, besides varying with age, also varies due to shell damage. No significant differences were found between the shapes of the shells of males and females. The shell characteristics of different populations of L. rudis also vary greatly, one of the causes being differences in the environmental conditions. When studying this variation between different populations, however, it must be emphasized that only undamaged shells of individuals of about the same age should be compared, in order to obviate the effects of the variability due to age differences and shell damage within each individual population.

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