The influence of mixing frequency and depth on phytoplankton mobility.

Flöder, Sabine

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The influence of mixing frequency and depth on phytoplankton mobility.

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Flöder, Sabine
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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引用

Flöder, S. (1999). The influence of mixing frequency and depth on phytoplankton mobility. International Review of Hydrobiology, 84(2), 119-128.

引用: https://hdl.handle.net/11858/00-001M-0000-000F-E112-9

要旨

The influence of mixing frequency and depth on phytoplankton functional group composition (mobile versus immobile species) was studied by enclosure experiments in a shallow, stratified lake. Mixing events were artificially induced at intervals from 2-12 d. The mixing depth was increased from the natural level (4 m) to 6 and 9 m. The mobile phytoplankton in the experiments consisted of cyanobacteria and flagellates. Among the latter, large and rapid swimming species were represented by dinoflagellates. An increase of the relative abundance of gas vacuolated cyanobacteria occurred with increasing frequency of mixing. Additionally Reynolds' hypothesis predicting the occurrence of certain mobile phytoplankton genera in response to the mixing regime could be confirmed for the condition when mixing depth exceeds the euphotic depth.