Didymosphenia geminata algae

January 15, 2008

Bow River Pristine Ice Flows

Calgary is the world’s cleanest city and the Bow River is clean enough for fly fishers. Algal ecologists are closely monitoring a bumper crop of Didymosphenia geminata bloom, an algae that thrives on dams and clean water.

Folksonomy: algal ecologist, bumper-crop blooming, jet-set fly fishers, Canadian Journal of Fisheries and Aquatic Sciences, rock snot, NB, Quebec, East Coast, New Zealand, headwater rivers of South Saskatchewan River basin, Bow River, Red Deer River,

Who’s who

Didymosphenia geminata (aka Didymo, rock snot) is a single-celled algae called a diatom which is attracted to pristine clear water, an unusual characteristic for algae. When it blooms it covers river bottom rocks with a shag carpet that can completely inundate kilometres of river bottom. Trout like clean waters and their habitat can be destroyed by this invasive Didymosphenia geminata bloom. It has been noticed in the Bow River near Calgary. See Kirkwood, Andrea E.

Kirkwood, Andrea E. akirkwoo@uncalgary.ca; Shea, T.; Jackson, L. J.; McCauley, E. Department of Biological Sciences, University of Calgary, 2500 University Drive

TERA Environmental Consultants, Suite 1100, 815-8th Avenue S.W., Calgary, AB T2P 3P2


2002 “[A]nglers and provincial scientists noticed blooms on lower reaches of the Bow River near Calgary, and the Oldman River below the Oldman Dam (Kirkwood, Shea, Jackson, McCauley 2007 ).”

2004 a “large-scale periphyton study in Red Deer and Bow rivers to investigate natural and anthropolical driven transitions in Alberta rivers” [. . .] The Bow River sub-basin is 26,240 km squared, whereas the Red Deer River sub-basin is 47,831 squared. The SSRB is located in the transition between the Rocky Mountains of western Alberta and the eastern Great Plains. Source water for these rivers originates along the eastern slopes of the Rocky Mountains and is a mixture (depending on the time of year) of rain water, glacial and snowmelt water, and groundwater. Though the Bow and Red rivers share similar edaphic and land-use characteristics, they differ with respect to urban footprints, sewage-agricultural inputs, and flow regulation-diversion by dams and hydroelectric utilties. The Bow River has five dams and one substantial weir that regulates and stabilizes flows, while the Red Deer River has only one dam (Kirkwood, Shea, Jackson, McCauley 2007).”

2005 “95% of the freshwater users of the South Island of New Zealand knew about didymo, yet it is hardly recognized within the general populace of North America and Europe (Special Session on Didymosphenia geminata ).”

2006 Special Session on Didymosphenia geminata. Western Division American Fisheries Society Meeting. May 15-16, 2006 Bozeman, Montana. REVISED Post meeting update. Over 60 scientists and aquatic managers from across the US, western Canada, New Zealand, England, and Iceland gathered to exchange information and discuss new findings at the special symposium in Bozeman. The symposium offered the opportunity for people to meet, develop ideas and collaborations, and to express concerns about the impacts of didymo. Donors included Federation of Fly Fishers, US Environmental Protection Agency, the Trout and Salmon Foundation, the Black Hills Fly Fishers, and the Overmountain Chapter of Trout Unlimited.

2007 Kirkwood et al noted the relationship between dams and Didymosphenia geminata bloom.

Webliography and Bibliography

2006. Special Session on Didymosphenia geminata. Western Division American Fisheries Society Meeting. May 15-16, 2006 Bozeman, Montana.

Brooymans, Hanneke, 2008. “‘Rock snot’ threatens rivers.” Calgary Herald. January 14. B2.

Kirkwood, Andrea E.; Shea, T.; Jackson, L. J.; McCauley, E. 2007. “Didymosphenia geminate in two Alberta headwater rivers: an emerging invasive species that challenges conventional views on algal bloom development.” Vol. 64. pp.1703-1709. http://restigouche.org/reports/Didymo_CJFAS.pdf

Kirkwood, Andrea. 2008. Canadian Journal of Fisheries and Aquatic Sciences.

Flynn-Burhoe, Maureen. 2008. “Dams, Didymo and jetset flyfishers: Didymosphenia geminata algae.”

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