BCCZO -- Diatoms -- Didymosphenia Geminata -- Boulder Creek -- (2008-2010)
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| Owners: | CZO BoulderCZO National |
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| Created: | Nov 19, 2019 at 3:35 a.m. |
| Last updated: | Oct 23, 2020 at 4:56 a.m. |
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Abstract
In the recent years, particularly since the 2002 drought, the presence of Didymosphenia Geminata have significantly increased in Colorado mountain streams. Didymosphenia geminata is a nuisance algal species also known as 'didymo' or 'rock snot'. Didymo can coat streambeds as a thick brown algal mat, with mats as thick as 1-2cm.
A study was conducted along Boulder Creek from 2008-2010 to investigate factors affecting the removal of D. geminta. Samples of D. geminata were collected at various points Boulder Creek between June 2008 and September 2010. Metrics for measuring didymo growth includes Didymo Rating Index (DRI), ash-free-dry-mass(AFDM), chlorophyll concentration and didymo cell densities. Didymo Rating Index(DRI) is a qualitative way to gauge didymo growth. It ranges from 0, representing no obvious signs of didymo growth, to a maximum of 10, representing 100% coverage and mats greater than 5 cm thick. The maximum DRI for Boulder Creek was a 6 or 7 (100% coverage with a mat thickness of 1 to 2cm).
Results of the study show the importance of taking into account site specific geomorphologic controls such as the potential for bed disturbance in addition to simple hydrologic controls such as variations in discharge. The results also show the importance of considering different controls for individual processes such distinguishing between the drivers of increased cell division or increased mat production in understanding the dynamics of complex ecological systems such as that presented by D. geminata.
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| Start Date: | 05/02/2008 |
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| End Date: | 09/30/2010 |
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Related Resources
| This resource is referenced by | Cullis J. (2010). Hydrologic Control of the Nuisance Diatom, Didymosphenia germinata . Colorado Water 2 (3) 4-6 |
| This resource is referenced by | Cullis, J., Crimaldi J., and McKnight, M. (2013). Hydrodynamic shear removal of the nuisance stalk-forming diatom Didymosphenia geminata. Limnology and Oceanography: Fluids and Environments http://dx.doi.org/10.1215/21573689-2414386 |
| This resource is referenced by | 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 http://dx.doi.org/10.1139/cjfas-2014-0314 |
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