Testing relationships between macroalgal cover and Secchi depth in the Baltic Sea |
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Authors: | Dorte Krause-Jensen, Jacob Carstensen, Karsten Dahl, Saara B ck,Samuli Neuvonen |
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Affiliation: | aUniversity of Aarhus, National Environmental Research Institute, Department of Marine Ecology, Vejlsøvej 25, DK-8600 Silkeborg, Denmark;bUniversity of Aarhus, National Environmental Research Institute, Department of Marine Ecology, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;cFinnish Environmental Institute, PL 140/P.O. Box 140, FIN-00251 Helsinki, Finland |
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Abstract: | The present study tests whether relationships between macroalgal cover and water quality, recently developed for Danish coastal waters, are more universal and also applies at the other extreme of the Baltic Sea in Finnish coastal waters. We found that algal cover increases as a function of Secchi depth according to the same logarithmic function in Danish and Finnish coastal waters. Algal cover at a given depth (here modelled for 4 m) increases with increasing Secchi depth and approaches a maximum at the high Secchi depths found in the clearest areas of the Danish coastal waters. For a given Secchi depth the combined Danish/Finnish algal model thus predicts a similar cover of the algal community at a given water depth at both extremes of the Baltic Sea which represent quite different algal habitats. These results suggest that light limitation, and thus shading effects of eutrophication may cause similar reductions of macroalgal cover across ecosystems. |
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Keywords: | Macroalgae Cover Secchi depth Empirical relationship Baltic Sea |
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