Chase, R., R. F. McMahon, 1995.   Starvation Tolerance of Zebra Mussels, Dreissena polymorpha, Center for Biological Macrofouling Research, The University of Texas at Arlington

Proceedings of The Fifth International Zebra Mussel and Other Aquatic Nuisance Organisms Conference, Toronto, Canada, February 1995

Starvation Tolerance of Zebra Mussels, Dreissena polymorpha

Abstract
Subsamples of zebra mussels, Dreissena polymorpha (n=30), were held for without food at 5°, 15°, or 25°C and examined daily for mortality. Further samples of 210 mussels at each test temperature were periodically subsampled (n =10) throughout the starvation period. Tissues and shells of sampled specimens were dried to a constant weight. Zebra mussels held at 25°C experienced 100% mortality after 166 days of starvation while mussels at 15°C experienced 100% mortality after 545 days. A mortality of 60% was recorded in mussels after 524 days at 5°C. Dry shell weight (DSW) of starving zebra mussels at 25°C remained constant; at 15°C, DSW increased, likely due to deposition of new shell without increase in length. At 5°C DSW decreased possibly due to the high volubility of shell calcium carbonate at this low temperature. Dry tissue weight (DTW) decreased linearly during starvation at all test temperatures with the rate of DTW loss increasing at higher holding temperatures. Estimated percent tissue biomass reductions in a 20 mm long starved individual were 73.8% after 132 days at 25°C, 68.9% after 545 days at 15°C and 61.6% after 516 days at 5°C. When DTW loss rates were converted to O2 consumption rates (O2) the O2of a 20 mm long mussel was estimated to be 22.2% of prestarvation O2 at 25°C, 11.0% at 15°C and 10.2% at 5°C. Major reduction in metabolic demand in starving zebra mussels at low temperatures allows overwintering without appreciable loss of organic energy stores.

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Keywords: Basic_biology, Biological_control, Zebra_mussel
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