Additionally, the available data for acute Cu toxicity in SW is no less variable than in FW (Fig. 1). The species sensitivity diagram (SSD) provided in Fig. 1 illustrates a variation of around four orders of magnitude among species/studies in acute
toxicity (see figure legend for details).Data collected fromsalinities of 25–38 ppt are included in Fig. 1 and water chemistries clearly varied among the studies forming the basis for the SSD. However, the variations in water chemistry at these high salinities are relatively small compared to relative variations in FW chemistry and therefore likely explain only a modest fraction of the variation in sensitivity.