Abstract
The Cladocera Bythotrephes cederstroemi appeared first in the nearshore waters of Lake Ontario in 1985 and had established itself in the offshore by 1987. Maximum offshore abundance in Lake Ontario in 1987 was 1,321 m -2 (102 m -3). During the autumn, the period of highest abundance, Bythotrephes accounted for 2% of the zooplankton biomass. The appearance of Bythotrephes in the offshore waters of Lake Ontario in 1987 is coincidental with a 65% decline in adult alewife abundance. In 1988, alewife abundance increased 50% and Bythotrephes was not present in zooplankton tows.
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