Calcium declines in northeastern Ontario lakes

By W. Keller, S. Dixit, Jocelyne H. Heneberry. 2001

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The interactive effects of calcium concentration and temperature on the survival and reproduction of Daphnia pulex at high and low food concentrations (2008, background): “As a result, Ca concentrations in the soft-water lakes of the south-central Canadian Shield have dropped by over 45% on average since preindustrial times (Keller et al. 2001), with individual lakes experiencing losses of 10–60% since just the 1980s (Keller et al. 2003; Yan et al. in press).”
Emerging threats and persistent conservation challenges for freshwater biodiversity (2018, background): “…is the slow but widespread decline in calcium (Ca) concentrations in low-carbonate systems across eastern North America (Likens et al. , 1998; Keller, Dixit & Heneberry, 2001; Molot & Dillon, 2008), Europe (Stoddard et al. , 1999; Skjelkv ˚ ale et al. , 2005; Hessen et al. , 2017), and…”
Species identity and aqueous calcium concentrations as determinants of calcium concentrations of freshwater crustacean zooplankton (2006, background): “1999); hence lake-water Ca concentrations are now quite commonly in decline (Keller et al. 2001; Jeffries et al. 2003; Watmough and Dillon 2003).”