New laboratory research shows that when viruses attack a species that forms toxic algal blooms, those thick, blue-green slicks that choke waterways and that threaten ecosystems, drinking water, and public health, what results might be even worse than before the infection.
New laboratory research shows that when viruses attack a species that forms toxic algal blooms, those thick, blue-green slicks that choke waterways and that threaten ecosystems, drinking water, and public health, what results might be even worse than before the infection. The finding questions the long-held theory among scientists that the viruses help regulate the negative effects of these blooms.
A team of environmental microbiologists led by Dr. Jozef Nissimov, a professor at the University of Waterloo, has shown for the first time experimentally that when viruses infect and kill Microcystis aeruginosa, a common species responsible for harmful algal blooms (HABs), they cause the release of high levels of the toxin microcystin-LR into the water from the infected cells.
The microcystin-LR toxin, a known liver toxin, remained in the water at levels roughly 40 times higher than the recommended concentration for recreational waters for several days after the infected cells died, even when the water itself appeared clear. This finding is significant because water clarity is often a prime visual cue to trigger additional testing, which can ultimately determine the safety of water for drinking and recreational use.
Read more at: University of Waterloo
Victoria Lee, undergraduate student and first author, sampling virus-infected and non-infected cyanobacterial cells during the experiments for assessing concentrations of the microcystin-LR toxin. (Photo Credit: University of Waterloo)
