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Increase in Nuisance Blooms and Geographic Expansion of the Freshwater Diatom Didymosphenia geminata

Open-File Report 2007-1425

Prepared in cooperation with the Federation of Fly Fishers
By:
,

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Abstract

The diatom Didymosphenia geminata (Lyngbye) Schmidt is emerging as an organism with an extraordinary capacity to impact stream ecosystems on a global scale. In recent years, streams in New Zealand, North America, Europe, and Asia have been colonized by unprecedented masses of "didymo" and its extracellular stalks (fig. 1). This diatom is able to dominate stream surfaces by covering up to 100 percent of substrate with thicknesses of greater than 20 cm, greatly altering physical and biological conditions within streams. This species is expanding its geographic range in North America and the rate that nuisance blooms are reported by the public and local media are increasing, yet little scientific investigation of the phenomenon in North America has been initiated.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Increase in Nuisance Blooms and Geographic Expansion of the Freshwater Diatom Didymosphenia geminata
Series title:
Open-File Report
Series number:
2007-1425
Year Published:
2007
Language:
ENGLISH
Publisher:
Geological Survey (U.S.)
Contributing office(s):
Fort Collins Science Center
Description:
iv, 38 p.
First page:
0
Last page:
0