Wednesday, September 17, 1997
The University Daily Kansan
Section A·Page 5
Microscopic invaders assault area lakes
Exotic water fleas have potential to damage native aquatic wildlife
By Mike Perryman
Kansan staff writer
Exotic water organisms invading Kansas and Missouri lakes and ponds could potentially cause a decline in native aquatic wildlife.
The microscopic water flea Daphnia lumholzi, which typically inhabits freshwater in Africa, Australia and Asia, has been turning up in freshwater environments in southeastern parts of the United states for years.
The exotic zooplankton has been
found in 10 of 35 lakes and reservoirs sampled in Kansas and Missouri. In the Lawrence area, the zooplankton were found in Clinton Lake, Stockton Lake and Olathe Lake.
Andy Dzialowski, a Kalamazoo, Mich., graduate student in aquatic ecology, has been studying the effects of lumholtzi on native freshwater habitats.
Native Daphnia, a food staple, could die out and disrupt the food chain if exotic Daphnia take over
indigenous species, he said.
Dzialowski said the exotic zooplankton probably were dispersed throughout Kansas and Missouri by fisherman, boats and waterfowl.
If native zooplankton were eliminated, local fish populations could potentially decrease because the majority won't eat lumholtzi, he said.
Jay Lennon, Lawrence graduate student in aquatic ecology, agreed. He said ninety-five percent of local fishes would prefer to eat native zooplankton species over exotic ones.
"Because of its size and special features, Daphnia lumholtzi, the exotic zooplankton, can out-compete native species," Lennon said. "Local sunfish will eat the native
"If fish like bluegill decline in numbers, then fish such as bass, which feed on bluegill, might decline in numbers as well."
Andy Dzialowski
Aquatic ecology graduate student
water fleas and will spit out the exotic ones."
But don't expect all the fish to disappear overnight.
"The effect that lumholtzi has on
local aquatic wildlife will probably take sometime to notice, and if there were a decline in fish numbers, it would occur slowly," Dzialwalki said.
A spine and tail that extend from both ends of the exotic water flea make it bigger than native species and less attractive to predators, he said.
Lumholtzi can be as big as five millimeters in length, whereas a native species might reach only one millimeter.
These small species might affect larger water life.
"If fish like bluegill decline in numbers, then fish such as bass, which feed on bluegill, might decline in numbers as well," Dzialowski said.
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