On the Myths of Indicator Species: Issues and Further Consideration in the Use of Static Concepts for Ecological Applications
Figure 6
Abundance-response curves (95th percentile QRS) of Corbula gibba along gradient of organic content (loss on ignition) in six different salinity classes in the North Sea and the Baltic Sea.
The dashed line marks the modelled optimum. Note that the y-axis had to be cut in some cases due to outliers.