Figure 2 | Scientific Reports

Figure 2

From: Widespread diminishing anthropogenic effects on calcium in freshwaters

Figure 2

Global distribution of long-term median calcium (Ca) concentrations in lakes and running waters. In dark red are site-specific long-term median Ca concentrations ≤ 1.5 mg HCO3 L−1 representing an approximate threshold considered critical for the reproduction and survival of a large variety of aquatic organisms. Some available long-term median Ca concentrations could not be shown in the figure, mainly from sites located in North America and Fennoscandia, due to the lack of exact geographical locations of sampling points.

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