Calcium loss turning lakes to 'jelly' critter habitats

Interesting

Falling calcium levels mean Daphnia cannot get the nutrients they need to survive and reproduce, and are consequently consuming less food and becoming more susceptible to predators, leaving more algae for other organisms to feed on.

This has left a small jelly-clad organism called Holopedium to take advantage. Holopedium are plankton competitors of the Daphnia that use less calcium, as well as a jelly coat that affords them greater protection from predators.