Acid Rain Has Turned Canadian Lakes into a Kind of Jelly

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Acid Rain Has Turned Canadian Lakes into a Kind of Jelly

Swimmers who dive into a number of Canadian lakes might not emerge clean and refreshed, but dripping with globs that resemble slimy fish eggs. A legacy of industrial pollution has caused great changes in the country's water chemistry, creating a boom in tiny organisms that transform lakes into "jelly."

The news from scientists says that populations of this particular organism have doubled since the 1980s in many of Ontario's lakes. The reasons involve a complex dance of species, but here's the short version: Acid rain caused by smelting operations and other human activity removed calcium from the soil in drainage areas. That depleted the calcium levels in many lakes, which has hurt a kind of plankton that needs the element to build armor. Enter a competing plankton requires far less calcium to bulk up and is coated with a gel that's excellent at repelling predators.

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