Abstract
During the last few decades the perennial seaweed Fucus vesiculosus L. has rapidly declined in large parts of the Baltic Sea. Indirect effects of eutrophication, such as increased turbidity, sedimentation, grazing and occurrence of filamentous algae, have generally been suggested as major factors causing the decline. It is only recently, however, that the effects of these factors have been experimentally tested and here we summarise these results in a new conceptual model. In many areas, it might be desirable to enhance the recovery of Fucus artificially, as the natural rate of re-establishment of this important macroalga is limited both in time and space. To be able to optimise and evaluate the potential of restoring Fucus belts in eutrophicated areas, we need to know how eutrophication affects critical steps in its life cycle, such as the attachment, germination and early growth of germlings. We suggest that more attention should be given to the survival of early post-settlement stages in Fucus as they are crucial for the maintenance and re-establishment of populations. We also stress that the two reproductive periods that the species exhibits are included in discussions concerning effects of eutrophication on Fucus, as it is likely that the outcome of reproduction will differ between the two reproductive periods. In the new conceptual model we distinguish between the effects on adult and juvenile life stages and we add the two reproductive strategies ofFucus.
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Berger, R., Bergström, L., Granéli, E., Kautsky, L. (2004). How does eutrophication affect different life stages of Fucus vesiculosus in the Baltic Sea? — a conceptual model. In: Kautsky, H., Snoeijs, P. (eds) Biology of the Baltic Sea. Developments in Hydrobiology, vol 176. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0920-0_22
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DOI: https://doi.org/10.1007/978-94-017-0920-0_22
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