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The Mollusca of the estuarine region of the rivers Rhine, Meuse, and Scheldt in relation to the hydrography of the area. 5. The Cardiidae
Koulman, J.G.; Wolff, W.J. (1977). The Mollusca of the estuarine region of the rivers Rhine, Meuse, and Scheldt in relation to the hydrography of the area. 5. The Cardiidae. Basteria 41(1-4): 21-32
In: Basteria: Tijdschrift van de Nederlandse Malacologische Vereniging. Nederlandse Malacologische Vereniging: Leiden; Lisse. ISSN 0005-6219, more
Peer reviewed article  

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Keywords
    Classification > Taxonomy
    Ecology
    Habitat
    Karyotypes
    Morphology
    Morphology
    Morphology
    Cardiidae Lamarck, 1809 [WoRMS]; Cerastoderma edule (Linnaeus, 1758) [WoRMS]; Cerastoderma glaucum (Bruguière, 1789) [WoRMS]
    Fresh water

Authors  Top 
  • Koulman, J.G.
  • Wolff, W.J., more

Abstract
    Based on literature data and personal investigations it is concluded that Cerastoderma edule and C. Glaucum are closely related, but distinct species. The haploid chromosome number of both species is 19. The distribution and ecology of the two species in the estuarine area of the rivers Rhine, Meuse and Scheldt are described in relation to environmental factors. C. Edule lives nearly exclusively in tidal environments, C. Glaucum in areas with stagnant water. This is in accordance with the hypotheses that C. Edule canot live in stagnant water, owing to a detrimental substance liberated by the living animals themselves, and that C. Glaucum does not tolerate wave-action or a long period of emersion. It is concluded that C. Edule shows a correlation between mean rib number and mean salinity, whereas C. glaucum does not. Therefore Eisma's (1965) method for determining the salinity of fossil seas is modified.

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