Toxic cyanobacteria and cyanotoxins have been detected in water throughout Zion National Park. Cyanobacteria is more commonly known as “blue green algae,” and its cyanotoxins can cause harm to humans and animals if touched or ingested.
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(The Narrows are currently closed due to high flows.) Cyanobacteria are small, aquatic, unicellular life forms capable of photosynthesis; they often grow in large colonies.
Scientists have discovered cyanobacteria in Zion at the bottom of the Virgin River and its tributaries. Benthic cyanobacteria are the sort of cyanobacteria found adhering to river bottoms. On rocks, plants, along the banks of rivers, and on the river's edge, benthic cyanobacteria flourishes.
DRINKING WATER: Virgin River water in the Zion Narrows is not safe to drink untreated. Either carry all the water you will need or bring a water filter (removes bacteria and protozoan cysts like Giardia from contaminated water) or purifier (a purifier also removes viruses).
Leeches are unique to Zion because they are an important food source to other animals. Leeches are eaten by many other animals which helps keep animals from starving.
Victims can die if they aren't transported right away to a lower altitude, he says. Rob Wissinger, emergency medical services coordinator for Zion National Park, says altitude sickness at Zion is pretty rare.