BCCZO -- Diatoms -- Didymosphenia Geminata -- Boulder Creek -- (2008-2010)


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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

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Resource Level Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Boulder Creek Watershed, Boulder Creek
North Latitude
40.3234°
East Longitude
-104.9676°
South Latitude
39.6819°
West Longitude
-105.7385°

Temporal

Start Date:
End Date:

Content

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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

alt text



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

References

Related Resources

The content of this resource serves as the data for: 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
The content of this resource serves as the data for: Cullis J. (2010). Hydrologic Control of the Nuisance Diatom, Didymosphenia germinata . Colorado Water 2 (3) 4-6
The content of this resource serves as the data for: 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

Cullis, J. (2020). BCCZO -- Diatoms -- Didymosphenia Geminata -- Boulder Creek -- (2008-2010), HydroShare, http://www.hydroshare.org/resource/a1eced7cf4e14244b2ff409555148248

This resource is shared under the Creative Commons Attribution CC BY.

 http://creativecommons.org/licenses/by/4.0/
CC-BY

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