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Notes on relations between density, settling, and growth of two sympatric cockles, Cardium edule (L.) and C. glaucum (Bruguière)
Brock, V. (1980). Notes on relations between density, settling, and growth of two sympatric cockles, Cardium edule (L.) and C. glaucum (Bruguière), in: Christensen, A.M. et al. Proceedings of the 6th Symposium of the Baltic Marine Biologists: Relationship and exchange between the pelagic and benthic biota. Århus, Denmark, 20-26 August 1979. Ophelia. Supplementum, 1: pp. 241-248
In: Christensen, A.M.; Muus, K. (Ed.) (1980). Proceedings of the 6th Symposium of the Baltic Marine Biologists: Relationship and exchange between the pelagic and benthic biota. Århus, Denmark, 20-26 August 1979. Ophelia. Supplementum, 1. Marine Biological Laboratory: Helsingør. ISBN 87-981066-0-0. 304 pp., more
In: Ophelia. Supplementum. Ophelia Publications: Helsingør. ISSN 0107-5896, more
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Document type: Conference paper
Keywords
    Cardium edule Linnaeus, 1758 [WoRMS]; Cardium glaucum Bruguière, 1789 [WoRMS]
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  • Brock, V.
Abstract
    Density dependent survival, growth and settling in bottom cages was investigated during the growth
    period, 1 April to 15 October 1978. The cages contained different densities of either Cardium
    edule, C. glaucum or both. They were placed under natural conditions in a sublittoral locality in
    the Limfjord, where the two closely related species occur in sympatry. The mortality of the cockles
    placed in the cages was comparable to that of an undisturbed reference area at the locality.
    Neither the initial density nor species combination in the cages did affect the growth of the
    survived cockles. Only C. edule did settle in the area the year concerned. Settlement of this cockle
    within the cages was inversely related to the density of the cockles already there, showing no
    species specific preference. High densitites, up to 1648 indv. per m2 of newly settled cockles, were
    found in the cages, while the densities outside, due to predation, was only 2 indv. per m2. The
    growth of the newly settled cockles was similar at higher and lower cage densities, showing that
    food was not the limiting factor, whereas density dependent regulation was found to act upon the
    settling process of the young cockles.
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