Abstract
Abstract Adult northern pike Esox lucius and largemouth bass Micropterus salmoides were monitored with ultrasonic transmitters in two 25-ha lakes in Colorado to evaluate the effect of water level drawdown on movement. Water levels in one lake were reduced from September through November, whereas an adjacent lake was held at full pool levels. Largemouth bass in the treatment lake moved greater distances and exhibited larger 24-h use areas during drawdown conditions. Increases in movement and use areas by northern pike associated with low water levels were not significantly different from those at full pool levels. Movement of largemouth bass and northern pike in the stable lake remained constant throughout the study. These results suggest that water level fluctuations may alter predator behavior.
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