Thermal Tolerance of Zebra Mussels (Dreissena polymorpha) Relative to Rate of Temperature Increase and Acclimation Temperature.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1995
- Accession Number
- ADA293154
Entities
People
- Robert F. Mamahon
- Thomas A. Ussary
Organizations
- University of Texas at Arlington