As reported by Israel21c:
It almost sounds like the plot of a sci-fi thriller: A beautiful but deadly family of blue-green algae strong-arms other freshwater microorganisms into becoming their slaves, enabling them to take control of the water and threaten health the world over. These dastardly cyanobacteria algae – the bullies of the freshwater playground – are no fictional characters. In a paper published online on August 12 in the journal Current Biology, a researcher at the Hebrew University (HU) of Jerusalem describes how they out-muscle their competition and proliferate dangerously, causing international concern due to their detrimental impact on water quality.
Read more here