2.3. Experimental set-up
To study interactions between Anabaena an deukaryotic algae,we
performed four different treatments in experimental laboratory
conditions. Anabaena was incubatedalone(A),withB.submarina(AB),
with R. salina (AR),andwithcopepodE. affinis (AZ). R. salina co-occurs
with the cyanobacterium throughout the Baltic Sea (Ha¨ llfors, 2004),
whereas distributions of our control species B. submarina and
Anabaena sp. do not overlap