On the biology of Appendicularia of the southeastern North Sea
Paffenhöfer, G.-A. (1976). On the biology of Appendicularia of the southeastern North Sea, 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. 437-455 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. European Marine Biology Symposia, 10(2). IZWO/Universa Press: Wetteren. ISBN 90-6281-002-0. 712 pp., more In: European Marine Biology Symposia., more |
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| Abstract | The densities of the appendicularians Oikopleura dioica and Fritillaria borealis and their potential food in the North Sea nearby the island of Sylt were investigated for 1 year. In conjunction with these studies feeding, growth, mortality and reproduction were measured in the laboratory at different phytoplankton concentrations at 13 °C. Generation times and fecundity of O. dioica were determined at temperatures between 7 and 18 °C in seawater passing through a 180pm mesh. The results indicate that generation times of 3-3.5 weeks and a fecundity of close to 250 eggs per female are sufficient to keep the standing stock of Appendicularia even during late winter and early spring, when they are preyed upon by larvae of plaice, Pleuronectes platessa L., and sandeel, Ammodytes sp., in the Southern Bight of the North Sea. |
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