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The Influence of Mixing Frequency and Depth on Phytoplankton Mobility
Author(s) -
Flöder Sabine
Publication year - 1999
Publication title -
international review of hydrobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 1434-2944
DOI - 10.1002/iroh.199900016
Subject(s) - phytoplankton , mixing (physics) , abundance (ecology) , enclosure , cyanobacteria , algae , environmental science , plankton , oceanography , ecology , biology , geology , nutrient , physics , paleontology , telecommunications , quantum mechanics , computer science , bacteria
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 euphoric depth.