Knowledge Researchers identify blue-green algae responsible for dead dogs

Researchers at the University of Neuchâtel have identified the strain of blue-green algae responsible for six dead dogs. According to the researchers, the results could help to better understand similar incidents worldwide.

Similar toxic strains of blue-green algae are widespread worldwide, the University of Neuchâtel announced on Tuesday.

After six dogs died of blue-green algae poisoning after swimming in Lake Neuchâtel in 2020, the university was commissioned by the cantonal authorities to investigate the cases.

Toxicological analyses showed that a modified form of anatoxin-a (ATX) - a toxin produced by certain blue-green algae - was most likely responsible for the deaths.

Blue-green algae with special properties

In their study recently published in the journal "Water Research X", the researchers have now shown which strain of blue-green algae produced this toxin. Using genetic analyses, they identified the "Microcoleus anatoxicus" strain. According to the researchers, this belongs to the same species as strains isolated in New Zealand, the USA and Canada. According to the university, these strains have a 15 percent smaller genome compared to other representatives of the genus "Microcoleus", which could accelerate their growth.

With rising water temperatures as a result of climate change, there is a risk that blue-green algae will occur more frequently in Swiss lakes and rivers in the future, the experts warned in the press release. They call for national monitoring of blue-green algae strains that are closely related to M. anatoxicus to help predict and mitigate similar cytotoxic events.

Since blue-green algae do not have a nucleus, they are not true algae from a scientific point of view, but bacteria. Experts therefore refer to them as cyanobacteria.

SDA