Cullis et al., 2015

Paper/Book

Hydrodynamic control of benthic mats of Didymosphenia geminata at the reach scale

Cullis, J., McKnight, M. and Spaulding, S. (2015)
Canadian Journal of Fisheries and Aquatic Sciences  

Abstract

Fig. 2.Photographs of the study sites in Boulder Creek: (A) Nederland, (B) Cold Springs, (C) Barker, (D) Ridge Road, (E) Rocky Knob, (F) Magnolia, (G) Sugarloaf, (H) Orodel, (I) Creek Path.

Fig. 2.Photographs of the study sites in Boulder Creek: (A) Nederland, (B) Cold Springs, (C) Barker, (D) Ridge Road, (E) Rocky Knob, (F) Magnolia, (G) Sugarloaf, (H) Orodel, (I) Creek Path.

Algal blooms caused by the stalk-forming diatom Didymosphenia geminata impact the habitat structure and functioning of stream ecosystems. We evaluated site-specific geomorphic controls on D. geminata in a cobble bed river in the Front Range of the Rocky Mountains. Entrainment potential, defined as the ratio of mean bed shear stress to the critical shear stress, was found to be the most important control on total abundance. A comparison with critical thresholds for sediment transport showed that the requirements for flushing flows to control D. geminata blooms are similar to that required for channel maintenance. Environmental parameters influencing the morphology of the algal mats and the potential for D. geminata to dominate the benthic algal community were also investigated. The results not only contribute to understanding of the controls on benthic algal growth in dynamic streams but also for management of water releases as mitigation for the control of future blooms of D. geminata.

Citation

Cullis, J., McKnight, M. and Spaulding, S. (2015): Hydrodynamic control of benthic mats of Didymosphenia geminata at the reach scale. Canadian Journal of Fisheries and Aquatic Sciences. DOI: 10.1139/cjfas-2014-0314

This Paper/Book acknowledges NSF CZO grant support.


Associated Data

Boulder Creek - Diatoms - Didymosphenia Geminata (2008-2010)
1 components    Boulder Creek Watershed    Biology / Ecology, Hydrology    James Cullis