Recent but widespread observations of aqueous calcium (Ca) declines in softwater lakes/ponds have spurred research on Ca-rich crustacean zooplankton as paleoindicators of the ecological consequences of Ca declines attributable to acidification, forestry, and other environmental stressors.
Jeziorski, A., Paterson, A., Yan, N., & Smol, J. (2009). Tracking the effects of “aquatic osteoporosis” using paleolimnology. PAGES News, 17(3), 106–108. https://doi.org/10.22498/pages.17.3.106