An extensive bloom of the invasive diatom known as “didymo” (Didymosphenia geminata) has been identified in South America for the first time (see "Didymo Confirmed in Remote Chilean Rivers"). Didymo is of significant concern because it can erupt into massive “nuisance blooms” that cover stream and river bottoms. These dense masses substantially alter the habitat of invertebrates, fish, and other aquatic life. FORT scientist and diatom expert Sarah Spaulding confirmed that this bloom, found on 35 river miles of two remote Chilean rivers near Esquel, Argentina, was caused by didymo. Because didymo can survive in damp conditions for more than 30 days, it is easily transported from one stream to another on the gear of anglers and boaters — the suspected cause of most occurrences, including the one in Chile. Didymo is found in streams and rivers in much of North America and is expanding its geographic range.
For more information contact: Sarah Spaulding
Increase in nuisance blooms and geographic expansion of the freshwater diatom Didymosphenia geminata
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Increase in nuisance blooms and geographic expansion of the freshwater diatom Didymosphenia geminata
The diatom Didymosphenia geminata, its spread, distribution, and formation of nuisance blooms
Confirmed distribution of Didymosphenia geminate (Lyngbye) Schmidt in North America
Proceedings of the 2007 International Workshop on Didymosphenia geminata
U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.fort.usgs.gov/News/News_story.asp
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