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Grazing of zooplankton on phytoplankton may contribute to a reduction of harmful cyanobacteria in eutrophic waters. However, the feeding capacity and interaction between zooplankton and toxic cyanobacteria vary among grazer species. In this study, laboratory feeding experiments were designed to measure the grazing rate of the copepod  Cyclops vicinus  on  Microcystis aeruginosa  and the potential microcystin (MC) accumulation in the grazer. Copepods were fed a mixed diet of the edible green alga  Ankistrodesmus falcatus  and toxic  M. aeruginosa  for 10 days. The results showed that C.  vicinus  efficiently ingested toxic  Microcystis  cells with high grazing rates, varying during the feeding period (68.9–606.3  Microcystis  cells animal -1  d -1 ) along with  Microcystis  cell density.  Microcystis  cells exhibited a remarkable induction in MC production under grazing conditions with concentrations 1.67–12.5 times higher than those in control cultures. Furthermore, C.  vicinus  was found to accumulate MCs in its body with concentrations increasing during the experiment (0.05–3.21 μg MC animal -1 ). Further in situ studies are needed to investigate the ability of  Cyclops  and other copepods to assimilate and detoxify MCs at environmentally relevant concentrations before deciding on the biocontrol of  Microcystis  blooms by copepods.

oceanological and hydrobiological studies

Grazing of the copepod <i>Cyclops vicinus</i> on toxic <i>Microcystis aeruginosa</i>: potential for controlling cyanobacterial blooms and transfer of toxins

Grazing of the copepod Cyclops vicinus on toxic Microcystis aeruginosa: potential for controlling cyanobacterial blooms and transfer of toxins