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| Effects of dredging activities on growth of Laminaria saccharina Lyngby, J.E.; Mortensen, S.M. (1996). Effects of dredging activities on growth of Laminaria saccharina, in: Dworschak, P.C. et al. (1996). Influences of organisms on their Environment, the role of episodic events: Proceedings of the 29th European Marine Biology Symposium Vienna, 29 August-2 September 1994. Marine Ecology (Berlin), 17(1-3): pp. 345-354
In: Dworschak, P.C.; Stachowitsch, M.; Ott, J.A. (Ed.) (1996). Influences of organisms on their environment, the role of episodic events: Proceedings of the 29th European Marine Biology Symposium Vienna, 29 August-2 September 1994. European Marine Biology Symposia, 29. Marine Ecology (Berlin), 17(1-3). 568 pp.
In: European Marine Biology Symposia.
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| Beschikbaar in | Auteurs |
| Documenttype: Congresbijdrage | |
| Trefwoorden |
Dredging Population functions > Growth Sedimentation Laminaria saccharina (Linnaeus) J.V.Lamouroux, 1813 [WoRMS] Marien/Kust |
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| Abstract |
The field study showed that Laminaria growth was significantly affected by the fine-grained material. The growth in the control experiment was 20% higher than in the treated plants. The chlorophyll a concentrations in the treated plants were significantly lower than in the control experiment, and the results indicated a reduced nutrient uptake in the treated plants. In the laboratory experiments the growth of the treated plants was only 30% of the controls, but no differences in photosynthetic capacities were detected. Nitrogen uptake was reduced in the treated plants, but no effects were observed on phosphorus uptake. Thick layers of fine-grained material caused direct harmful effects and rotting. The results are discussed in relation to dredging activities; it is concluded that in heavy sedimentation areas, Laminaria growth may be significantly reduced beyond the indirect effect of shading from suspended material in the water. |
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