Extensive field data was collected from lake complexes in the Romanian part of the Danube Delta, to assess the occurrence of harmful cyanobacterial blooms. Since detailed long-term monitoring data were missing from those lakes, from sediment cores we:
- reconstructed occurrence and structure of cyanobacterial blooms by PCR
- evaluated the presence of toxic genes by PCR
- resurrected Daphnia from resting eggs
- tested pre- and post-eutrophication Daphnia populations for local adaptation to cyanobacterial blooms in laboratory experiments.