Biologists find new environmental threat in North American lakes

A new and insidious environmental threat has been detected in North American lakes by researchers from Queen's and York universities. Along with scientists from several Canadian government laboratories, the team has documented biological damage caused by declining levels of calcium in many temperate, soft-water lakes. Calling the phenomenon 'aquatic osteoporosis,' Queen's PhD candidate Adam Jeziorski, lead author of the study, notes that calcium is an essential nutrient for many lake-dwelling organisms. 'Once calcium declines below a certain threshold, some keystone species can no longer reproduce,' he says...

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