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Fig. 9. O2 content (O2-data from North Rhine-Westphalia State
Environment Agency) and valve closure behaviour of C. fluminea (27
specimens in parallel) inside the Rhine at Bad Honnef during July 23-31 1998,
recorded by the Dreissena-Monitor®. Illustrated are the proportions of
opened clams inside the two parallel flumes of the monitor. Dotted lines
indicate the change of date, 0:00 h, water temperature varied between 22°C
and 24°C.
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