They were discovered only two years ago and already they have:
?Caused a partial
shutdown of Detroit Edison's largest power plant.
Michigan hospital to dismiss patients and cancel elective surgery.
destroy some game-fish spawning grounds in Lake Erie.
?Shut down the
water supply to Monroe, Mich., for two days.
Edison, which provides electricity for nearly two million customers in
southeastern Michigan, $500,000 a year in increased maintenance costs.
boaters on Lake Erie by sinking navigational markers.
water supply facilities of Cleveland and Detroit and several smaller
In the next few
years they may:
microscopic phytoplankton, a basic element in the freshwater food web, from