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The biomass of Cladophora glomerata (L.) Kütz, was estimated at selected sites in the Colorado River between Glen Canyon Dam, Arizona, and River Kilometer 354. C. glomerata biomass was significantly higher at sites above Lees Ferry (25 km downstream from the Dam) than sites below the Ferry. Biomass and chlorophyll a were significantly reduced when C. glomerata was subjected to one-time exposures to the atmosphere for 12 daylight h or more. Repeated 12/12 h and 24/24 h and (exposure/submergence) cycles over a two-week period also showed a significantly reduction in biomass. The adaptations of C. glomerata to "stranding" during regulated flows are discussed. [ABSTRACT FROM AUTHOR]