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Gloeotrichia toxins
While research on toxin production of specific species of Gloeotrichia is limited, some species are potentially harmful. In Lake Sunapee, found in the northeast US, Gloeotrichia echinulata have been found to produce microcystin-LR which could become a risk to the health of humans and aquatic ecosystems. Microcystins are a group of potent heptapeptide hepatotoxins, which contains more than 85 known varieties, produced by different species of aquatic cyanobacteria. Gloeotrichia echinulata are found in a variety of ecosystems, but tend to form large, potentially dangerous blooms in lakes with eutrophic and  poor ecological status.