Abstract
Harmful algal blooms in eutrophic waters pose a serious threat to freshwater ecosystems and human health. In-situ light availability control is one of the most commonly used technologies to suppress algae in lakes and reservoirs. To develop a better understanding of the effects of light on algal growth, specific density, colony size and sinking loss, Anabaena flos-aquae (cyanobacteria) and Scenedesmus obliquus (green algae) were evaluated in varying light scenarios. The results showed that the specific density and colony size of these two species varied during growth, and there were obvious differences among the light scenarios. At the end of exponential phase, S. obliquus incubated under light-limited condition maintained a higher specific density and formed larger aggregates, whereas A. flos-aquae formed a longer filament length. Both species exhibited higher sinking loss rates with lower light availability. These results implied that the sinking loss rate was not always constant but should be considered as a variable response to the change of light availability, and in-situ light availability control might result in a significant increase of the sinking loss of algae due to the change of size and specific density, thereby further affecting the algal biomass in the water column.
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Supported by the National Natural Science Foundation of China (No. 41471393) and the Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration (No. SHUES2016B03)
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Huang, Y., Zhang, H., Gao, R. et al. Influence of light availability on the specific density, size and sinking loss of Anabaena flos-aquae and Scenedesmus obliquus. J. Ocean. Limnol. 36, 1053–1062 (2018). https://doi.org/10.1007/s00343-018-7154-1
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DOI: https://doi.org/10.1007/s00343-018-7154-1