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Studies on population dynamics and productivity of some bivalves in the German Bight
Rachor, E.; Salzwedel, H. (1976). Studies on population dynamics and productivity of some bivalves in the German Bight, in: Persoone, G. et al. (Ed.) Proceedings of the 10th European Symposium on Marine Biology, Ostend, Belgium, Sept. 17-23, 1975: 2. Population dynamics of marine organisms in relation with nutrient cycling in shallow waters. pp. 575-588
In: Persoone, G.; Jaspers, E. (Ed.) (1976). Proceedings of the 10th European Symposium on Marine Biology, Ostend, Belgium, Sept. 17-23, 1975: 2. Population dynamics of marine organisms in relation with nutrient cycling in shallow waters. IZWO/Universa Press: Wetteren. ISBN 90-6281-002-0. 712 pp., more

Available in  Authors 
    VLIZ: Proceedings [4874]
Document type: Conference paper

Keyword
    Marine

Authors  Top 
  • Rachor, E., more
  • Salzwedel, H.

Abstract
    In the course of long-term investigations on variations and productivity of sublittoral benthic macrofauna in the German Bight several bivalve species have been investigated since 1969. Report is given about annual variations and about the long-term development in numerical abundance. The species Nucula nitidosa, Tellina tabula and Cultellus pellucidus have been studied more intensively. C. pellucidus and T. tabula were found to breed in summer with the breeding season of the latter species being more prolonged. The reproduction of N. nitidosa starts in late summer lasting till spring. Large animals of C. pellucidus (30 mm length) and T. tabula (20 mm) are supposed to be 2-3 years old, whereas Nucula specimens of 9 mm length are about 5 years old. Data on growth are presented. The productivity of N. nitidosa was calculated with the annual P:B ratio (turnover-rate) being about 1.5 at a standing stock biomass of 1.3 g dry tissue wt/m².

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