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The Dreissena-Monitor is a biological early warning system for the aquatic environment. It is based on the valve movements of up to 2 × 42 specimens of the zebra mussel Dreissena polymorpha, exposed in a flow-through system of 2 experimental channels connected to the water to be tested. A computer records whether a mussel is open or closed. After an analysis period of 5 min, the percentage of open...
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