Sampling at Lake Greifensee (CH) to analyze for cyanobacterial toxins – University of Copenhagen

13 August 2018

Sampling at Lake Greifensee (CH) to analyze for cyanobacterial toxins

Monitoring phytoplankton

Regiane Natumi (ESR10) and Elisabeth Janssen monitored the phytoplankton density particularly by following the pigments chlorophyll and phycoerythrin

By Regiane Natumi (ESR10) and Elisabeth Janssen

The summer in Europe is particularly intense this year and warm temperatures benefit the proliferation of periphyton in surface waters including cyanobacteria that are responsible for harmful “algal” bloom events.

The researchers from the ecology department at Eawag have a research station at Lake Greifensee in Switzerland where water parameters such as chlorophyll, dissolved oxygen, water temperature, pH etc. are monitored continuously and depth profiles are taken daily (http://parsivel-eawag.ch/greifensee/profile.php).  An automated plankton camera monitors phytoplankton (size range 10 µm – 150 µm) and zooplankton (size range 100 µm – 1.5 mm) at 3 m dept ( https://aquascope.eawag.ch/). 

Analytical probes at lake Greifensee monitoring station.

For the natural toxin project, we monitor the phytoplankton density particularly by following the pigments chlorophyll and phycoerythrin that guide us to the depth with the highest density.

Sampling with plankton net to obtain biomass samples (left) and with Niskin bottle (right) to collect lake samples at lake Greifensee.

We take water and biomass samples, that we later analyze back in the laboratory. We are interested in determining, which cyanobacterial toxins are present in these samples and compare the toxin profiles in the field to those obtained from pure bacterial strains in the laboratory.

Photos are taken by Elisabeth Janssen 2018.