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News Release 11-109

River Mystery Solved

Scientists discover how "Didymo" algae bloom in pristine waters with few nutrients

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Photo of Rapid Creek, S.D.

Didymo is present at many points along Rapid Creek, S.D., and in pristine streams and rivers worldwide.

Credit: P. V. Sundareshwar


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Photo of streambed of Rapid Creek, S.D., covered with algal mats.

Streambed of Rapid Creek, S.D., covered with Didymo mats (brown) and other algae (green).

Credit: P. V. Sundareshwar


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Photo of scientist P.V. Sundareshwar on right and colleague examining Didymo.

Scientist P.V. Sundareshwar (right) and colleague get to know Didymo up close and personal.

Credit: Christie Sandvik


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Photo of a rock from the bottom of Rapid Creek covered with mats of Didymo.

A rock from the bottom of Rapid Creek, covered with mats of Didymo.

Credit: Christine Sandvik


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Photo of P.V. Sundareshwar with co-authors Berdanier and Honomichl analyzing water quality.

P.V. Sundareshwar, with paper co-authors Berdanier and Honomichl, analyzing water quality.

Credit: Karen Updegraff


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Photo of unpolluted river in Chilean Patagonia that has been invaded by Didymo.

Unpolluted river in Chilean Patagonia, among many such rivers invaded by Didymo.

Credit: P. V. Sundareshwar


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