Chile coot case flags cyanobacterial bloom risk in protected wetland

A new case report in Veterinary Sciences describes probable microcystin toxicosis in a red-gartered coot (Fulica armillata) found during a broader wildlife mortality event at Laguna Petrel, a protected urban wetland in Pichilemu, central Chile. The authors combined environmental sampling, pathology, and toxicology to link the bird’s death to a cyanobacterial harmful algal bloom, adding to a still-limited body of well-documented avian cases with multi-layered evidence. The finding also stands out because Petrel was officially recognized by Chile’s Environment Ministry as the first urban wetland in the O’Higgins region in 2021, underscoring that protected status doesn’t eliminate bloom risk in eutrophic systems. (mma.gob.cl)

Why it matters: For veterinary professionals, the report reinforces that wildlife deaths can be an early warning for wider ecosystem and companion-animal risk. CDC-backed One Health guidance has highlighted animals as sentinels for harmful algal blooms because they may be exposed earlier or more intensely than people, while microcystins remain among the best-recognized cyanotoxins affecting animals through acute hepatotoxicity. In practice, that means unexplained bird die-offs near discolored, scummy, or foul-smelling water should prompt consideration of cyanotoxin exposure alongside infectious and chemical differentials, with attention to coordinated sampling of water, tissues, and local exposure history. (stacks.cdc.gov)

What to watch: Whether this case drives more routine cyanotoxin surveillance in Chilean wetlands, especially as recent research continues to document microcystin persistence and broader harmful algal bloom risks in the country. (pubmed.ncbi.nlm.nih.gov)