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Effects of low temperature change power plant temperatures on estuarine invertebrates



Effects of low temperature change power plant temperatures on estuarine invertebrates



Journal Water Pollution Control Federation 48(10): 2259-2272



A study was initiated to assess thermal impact that may occur to estuarine macroinvertebrates [Gammarus sp., Palaemonetes spp., Neomysis americana, Callinectes sapidus, Rhithropanopeus harrisii] entrained through low .DELTA.T [temperature change] (5.degree. C maximum) steam-electric generating stations with once-through cooling systems designed for rapid mixing in receiving streams. The time-temperature model used caused no immediate or latent mortality of any species at the seasonal temperatures studied; the question of sublethal thermal stress was addressed by using changes in whole animal O2 consumption patterns as an indicator of stress. Although some species responded by a significant increase in O2 consumption when exposed to the time-temperature model, the response was determined to be a normal physiological temperature compensation response and not a response indicative of thermal stress. Thermal impact to estuarine macroinvertebrates entrained through low .DELTA.T power plants with once-through cooling systems designed for rapid mixing in receiving streams should be minimal and should allow utilities to meet many current federal and state discharge temperature regulation requirements.

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Accession: 005312956

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