MONITORING OF BEHAVIORAL-PATTERNS OF AQUATIC ORGANISMS WITH AN IMPEDANCE CONVERSION TECHNIQUE

An impedance converter, based on the tetrapole electrode system, was u sed to record the behavioral patterns of a wide range of aquatic organ isms, such as Daphnia magna, Gammarus pulex, Sialis lutaria, Leptophle bia vespertina, Baetis niger, Simuliidae, Dinocras cephalotes, Hydrops yche siltalai, and tadpoles of Rana temporaria. The method proved to b e sensitive for different kinds of behavior, e.g., ventilation, grazin g, filter feeding, net spinning, and locomotion (swimming, creeping, a nd looping), which makes it a promising tool for continuous biomonitor ing purposes.