On the Abundance of Tubificidae (Annelida: Oligochaeta) in the Profundal Benthos of Some Wisconsin Lakes

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Abstract
Data from a survey of the profundal benthos of 26 Wisconsin lakes [USA] suggested that tubificid worms occur more commonly, and are typically abundant, in the benthos of the more oligotrophic lakes but gave no evidence of overall relationships with trophic status. Correlation analysis indicated that conditions which favor tubificids are higher dissolved O2 concentrations (within the range encountered), great depth and low numbers of the dipteran predator Chaoborus. The observations led the the hypothesis that predation by dipteran larvae may strongly influence worm abundance in the profundal benthos and that predation may be particularly important when worm production is low because of anoxia or low dissolved O2 concentrations.

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