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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.
Subject Keywords
Coverage
Spatial
Temporal
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Content
ReadMe.md
BCCZO -- Diatoms -- Didymosphenia Geminata -- Boulder Creek -- (2008-2010)
OVERVIEW
Description/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. http://westerndiatoms.colorado.edu/taxa/genus/Didymosphenia Click here to get more details and microscopic views of D. geminata.
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( http://czo.colorado.edu/html/mapPages/cullismap.html see map ) 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.
Creator/Author
James Cullis
CZOs
Boulder
Contact
BCCZOData@colorado.edu
SUBJECTS
Disciplines
Biology / Ecology|Hydrology
Topics
Diatoms
Subtopic
Didymosphenia Geminata
Keywords
Didymosphenia Geminata|diatom|Boulder Creek
Variables
Didymo Rating Index (DRI)|ash-free-dry-mass(AFDM)|chlorophyll concentration and didymo cell densities.
Variables ODM2
Biomass|Chlorophyll a, corrected for pheophytin
TEMPORAL
Date Start
2008-05-02
Date End
2010-09-30
SPATIAL
Field Areas
Boulder Creek Watershed
Location
Boulder Creek
North latitude
40.32340768787086
South latitude
39.68192824657209
West longitude
-105.73852879278799
East longitude
-104.96763506818859
REFERENCE
Citation
Cullis, James. Removal of benthic algae in swift-flowing streams: the significance of spatial and temporal variation in shear stress and bed disturbance. Thesis submitted to the Faculty of the Graduate School of the University of Colorado in partial fulfillment of the requirement for the degree of Doctor of Philosophy Department of Civil, Environmental and Architectural Engineering
Publications of this data
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
Cullis J. (2010). Hydrologic Control of the Nuisance Diatom, Didymosphenia germinata . Colorado Water 2 (3) 4-6
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
CZO ID
2862
Additional Metadata
| Name | Value |
|---|---|
| czos | Boulder |
| czo_id | 2862 |
| citation | Cullis, James. Removal of benthic algae in swift-flowing streams: the significance of spatial and temporal variation in shear stress and bed disturbance. Thesis submitted to the Faculty of the Graduate School of the University of Colorado in partial fulfillment of the requirement for the degree of Doctor of Philosophy Department of Civil, Environmental and Architectural Engineering |
| keywords | Didymosphenia Geminata, diatom, Boulder Creek |
| variables | Didymo Rating Index (DRI), ash-free-dry-mass(AFDM), chlorophyll concentration and didymo cell densities. |
| disciplines | Biology / Ecology, Hydrology |
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 |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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