Ref ID : 838
Matyas Presing and Mihaly Vero; A new method for determining the heart beat rate of Daphnia magna. Water Research 17(10):1245-1248, 1983
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Daphnia is a very frequented test organism in aquatic toxicology. A suitable technique has been worked out to measure its heart beat rate. The intensity of light current passing through the heart of Daphnia magna changes according to its contractions. The changes of the light intensities are transformed by an opto-electronic circuit into potential changes. A sequential interval-time function was prepared by working out the measured records with a data logger. In this, the recording of the heart beat rate of Daphnia spp. could be realized with msec accuracy. The effect of a herbicide-Dikonirt, containing 2,4-D could be registered with the technique prepared on the heart beat rate of D. magna in solutions of 250 and 500 mg/l, respectively. The heart beat rate of the animal was reduced remarkedly with 500 mg/l and in a much smaller extent by 250 mg/l solutions, respectively.