Accession Number : ADA293154

Title :   Thermal Tolerance of Zebra Mussels (Dreissena polymorpha) Relative to Rate of Temperature Increase and Acclimation Temperature.

Descriptive Note : Final rept.,

Corporate Author : TEXAS UNIV AT ARLINGTON DEPT OF BIOLOGY

Personal Author(s) : MaMahon, Robert F. ; Ussary, Thomas A.

PDF Url : ADA293154

Report Date : FEB 1995

Pagination or Media Count : 28

Abstract : For Dreissena polymorpha and other macrofouling species, upper lethal thermal limits are generally expressed as tolerance times of specific lethal temperatures. In some raw water systems, reduced efficiency and increased component wear make prolonged maintenance of elevated temperatures for thermal treatment of biological macrofouling infeasible. A more efficacious thermal treatment could involve increase in water temperature until instantaneous 100-percent mortality is achieved followed by rapid retum to normal operating temperatures. To provide baseline data for this strategy, the effects of rate of temperature increase and prior temperature experience (i.e., acclimation temperatures) on acute upper lethal temperature (AULT) of zebra mussels were assessed. Mussels were acclimated > 14 days to 5, 10, 15, 20, 25, and 30 0C. Their AULTs were determined as LT50, LT100 (i.e., estimated temperatures of 50-percent and near 100-percent sample mortality), and SM100 values (i.e., lowest actual temperature of 100-percent sample mortality). AULT values were assessed for mussels exposed to heating rates of 1 deg C per 5, 10. 15, 20, 30, 45, and 60 min.

Descriptors :   *THERMAL PROPERTIES, *MUSSELS, *FOULING ORGANISMS, *MOLLUSCACIDES, MAINTENANCE, TEMPERATURE, WATER, HIGH TEMPERATURE, RATES, EFFICIENCY, HEAT TREATMENT, REDUCTION, BASE LINES, HEATING, TOLERANCE, LETHALITY, WATER SUPPLIES, ACCLIMATIZATION.

Subject Categories : Stress Physiology
      Hydrology, Limnology and Potamology
      Air Condition, Heating, Lighting & Ventilating

Distribution Statement : APPROVED FOR PUBLIC RELEASE