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Detection of transversal migration of larvae of chaoborus flavicans diptera chaoboridae by the use of a sonar system



Detection of transversal migration of larvae of chaoborus flavicans diptera chaoboridae by the use of a sonar system



Archiv fuer Hydrobiologie 109(3): 355-366



Horizontal echo sounding with a 200 kHz sonar system revealed a marked dlittoral migration of larvae of Chaoborus flavicans in the lake Heiligensee (Berlin-West [West Germany]) at night, confirming former findings of transversal migration of larvae. There is evidence that horizontal swimming speed is in the range of 20 m/h. It is hypothesized that transversal migration is the strategy for maintaining a stable time-space distribution of larvae. Concomitantly with larvae there is also a nocturnal immigration of fish into the littoral. Possible interactions on the basis of a predator-prey relationship are discussed.

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Accession: 005119452

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