The thematic report on Eutrophication as part of the Quality Status Report 2017 (QSR 2017) provides an overview of the present status of human induced nutrient input into the Wadden Sea, based on the Trilateral Monitoring and Assessment Program (TMAP). This status review describes ecological targets, eutrophication effects and trends and developments.

From the QSR 2017, thematic report on eutrophication:

Eutrophication is one of the factors that influence the environmental quality of the Wadden Sea area. Since the earliest nutrient measurements in the Wadden Sea during the mid-20th century (Postma, 1954; Postma, 1966; Hickel, 1989) a clear increase in nutrient concentrations until the 1990s has been documented (e.g., de Jonge & Postma, 1974, Hickel, 1989, van Beusekom et al., 2001). Among the negative effects associated with the increased nutrient inputs are more intense Phaeocystis-blooms (Lancelot et al., 1987), a decline in seagrass distribution (de Jonge & de Jong, 1992), increased cover with green macroalgae (Reise & Siebert, 1994) and anoxic sediments (Black Spots, de Jong et al., 1999a). Measures were taken during the 1970s and 1980s to address eutrophication (de Jong, 2007) through a reduction of riverine nutrient inputs to the North Sea, which have been effective since the mid-1980s (Radach & Pätsch, 1997). [….read more]

Quality Status Report 2017: Eutrophication (v. Beusekom et al.)
Quality Status Report 2009: Thematic Report No. 6: Eutrophication (v. Beusekom et al.)
Quality Status Report 2004: Chapter 5: Eutrophication: (v. Beusekom et al.)