La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Reduced Cover of Drifting Macroalgae Following Nutrient Reduction in Danish Coastal Waters
Auteurs :	Jonas Ribergaard Rasmussen, Auteur ; Karsten Michael Dromph, Auteur ; Cordula Goke, Auteur ; Dorte Krause-Jensen, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (38(5) SEP 2015)
Article en page(s) :	1664-1677
Résumé :	Based on a large dataset from the national Danish monitoring programme, we analysed the temporal variability of drifting algae cover in shallow (1-2 m) water during a period of reduced nutrient loadings. Algal cover was analysed both in absolute terms and relative to eelgrass, Zostera marina, cover to test the hypotheses that (1) the cover of drifting algae and the relative dominance of algae versus eelgrass in shallow waters have declined in parallel to reductions in nutrient levels during the last decades, and (2) spatio-temporal differences in algal cover can be related to differences in nutrient conditions and environmental characteristics. The cover of drifting algae was positively related to total nitrogen concentration and Secchi depth but negatively related to exposure, salinity and mean summer temperature. The cover of drifting macroalgae showed significant declines over the past two decades, paralleling the reduction in nutrient concentrations. The present cover of drifting algae is low (

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