La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Depth colonization of eelgrass (Zostera marina) and macroalgae as determined by water transparency in Danish coastal waters
Auteurs :	S. L. Nielsen, Auteur ; K. Sand-Jensen, Auteur ; J. Borum, Auteur ; O. Geertz-hansen, Auteur
Type de document :	Article
Dans :	Estuaries (25(5) OCT 2002)
Article en page(s) :	1025-1032
Résumé :	We present a comparative analysis of lower depth limits for growth of eelgrass, large brown algae and other macroalgae measured by SCUBA-diving along 162 transects in 27 Danish fjords and coastal waters, coupled to 1,400 data series of water chemistry (especially nitrogen) and Secchi depth transparency collected between March and October. Danish coastal waters are heavily eutrophied and characterized by high particle concentrations, turbid water and lack of macrophyte growth in deep water. Median values are 3.6 to for Secchi depth and median lower-depth limits are 4.0 m for eelgrass, 5.3 m for brown algae and 5.0 m for other macroalgae. Depth limits for growth of eelgrass and macroalgae increase linearly with transparency in the coastal waters. The relationships are highly significant (p

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