Scientists dig bugs to help lakes' health

Although for decades water experts have examined insect life near direct sources of pollution, it has only been in the past few years that scientists have learned how to use bug life to assess water quality as a whole in large lake systems; the macroinvertebrate assessment -- invertebrates are creatures, like worms, snails and insects, without backbones -- is a complex procedure but gives a more complete picture of a lake's well-being than standard chemical testing - Sep. 1, Orlando Sentinel