Fig. 2
From: High mortality of Pacific oysters in a cold winter in the North-Frisian Wadden Sea
Boxplots of Pacific oyster densities (n/m2) on four sites in the List tidal basin in the period September 2003 to May 2010 (left column) and on three sites between the islands of Amrum and Föhr (right column) in the period 2005–2010. Only oysters >3 cm were included. The thick horizontal line in the box is the median and the box is defined by the 25th and 75th percentiles. Points are outliers. Be aware of different y-axis scales