Circadian rhythms are thought of as means for adaptation helping survival fitness of a species. For algal species associated with harmful algal blooms (HAB) in eutrophied freshwater lakes usually light and nutrient availability, especially phosphate, seem to drive patterns of the vertical
migration within the water column. The vertical migration patterns of species associated with HAB in freshwater lakes (Cyanobacteria) should be taken as input parameters for modelling algae. As HAB present a health risk to the public they should be monitored and predicted via simulation models,
and the results of the predictions should be shared with the public using familiar tools such as smartphone apps or websites. To gather the data on which the model will be formulated, two shallow freshwater lakes (eutrophic condition: Lake Stadtgraben, Northern Germany, oligotrophic condition:
Lake Russo, Wisconsin, USA in temperate climates were selected to serve as models for investigating the vertical migration in different seasonal times under natural conditions. Phosphate concentrations, as well as light and temperature over time in hourly increments at the lake surface and
bottom were monitored. In addition the vertical migration pattern of Cyanobacteria and Chlorophyta populations was followed over 24 hrs in spring (May) and fall (August) in order to derive a behavior assumption as input for a model predicting HAB. In Lake Stadtgraben the vertical migration
pattern was strongly influenced by light rather than by phosphate availability in spring, as phosphate was readily available at that time in all depths, while temperature was significantly different between the top and -bottom. The vertical migration pattern was dampened in fall season in
both, the oligotrophic and the eutrophic lake, while temperature was not significantly different from the top to the bottom. Thus, vertical migration patterns observed may change slightly with season, which will impact on the outcome of simulation models dependent on the time of day and lake
depth, at which input parameters such as Chlorophyll-a are measured.
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HARMFUL ALGAL BLOOMS (HAB);
Document Type: Research Article
December 1, 2017
This article was made available online on December 7, 2017 as a Fast Track article with title: "Diurnal vertical migration of cyanobacteria and chlorophyta in eutrophied shallow freshwater lakes".
More about this publication?
Fundamental and Applied Limnology is an international journal for freshwater research in the widest sense, including problems of marine biology and brackish water research. Papers dealing with ecological topics are especially welcome in association with experimental or physiological studies. All papers published in this journal are subject to peer review.
Archiv für Hydrobiologie, now Fundamental and Applied Limnology has been published continuously since 1906.
Volumes prior to vol. 168 were published under the previous title Archiv für Hydrobiologie.
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