Fig. 2
From: Increasing nitrogen limitation during summer in the List Tidal Basin (Northern Wadden Sea)
Light- and nutrient limitation in the List Tidal Basin in the periods 1985–1991 and 1999–2005. The contour plot displays the gradients from strong light limitation (dark grey shadings) to strong nutrient limitation (white). The continuous lines represent the boundary lines between strong light limitation and co-limitation. The broken lines represent the boundary between co-limitation and strong nitrogen limitation