Fig. 4
From: High mortality of Pacific oysters in a cold winter in the North-Frisian Wadden Sea
Changes (in %) of mean oyster densities per m2 (oysters >3 cm) on mussel beds in the List tidal basin (a) and between the islands of Amrum and Föhr (b). Data for mussel beds in the List tidal basin (a) refer to the period between autumn and spring of the following year, i.e. autumn 2003 in comparison to spring 2004. Data from the Amrum Deep (b) cover changes between annual summer samples