Dataset Listing

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

Variables:  Didymo Rating Index (DRI), ash-free-dry-mass(AFDM), chlorophyll concentration and didymo cell densities.

Date Range:  (2008-05-02 to 2010-09-30)

Dataset Creators/Authors:  James Cullis

Contact:  BCCZOData@colorado.edu

Field Area:   Boulder Creek Watershed

Description
Keywords
Citation
Publications
  • Description

    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. 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(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.
  • Keywords

    Didymosphenia Geminata, diatom, Boulder Creek

  • Citation for This Dataset

    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

    Citation for This Webpage

    James Cullis (2010). "CZO Dataset: Boulder Creek - Diatoms (2008-2010) - Didymosphenia Geminata." Retrieved 20 Sep 2017, from http://criticalzone.org/national/data/dataset/2862/

  • Publications

    Primary Publications

    2013

    Hydrodynamic shear removal of the nuisance stalk-forming diatom Didymosphenia geminata. Cullis, J., Crimaldi J., and McKnight, M. (2013): Limnology and Oceanography: Fluids and Environments

    2010

    Hydrologic Control of the Nuisance Diatom, Didymosphenia germinata . Cullis J. (2010): Colorado Water 2 (3) 4-6

    2015

    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

Data

Boulder Creek - Didymo rating density, ash-free-dry-mass(AFDM), chlorophyll concentration

(xlsx)   Data Level 0

Data Use Policy
Data Sharing Policy
Overview Maps
  • Data Use Policy

    DRAFT v.0.4.0

    1. Use our data freely. All CZO Data Products* except those labelled Private** are released to the public and may be freely copied, distributed, edited, remixed, and built upon under the condition that you give acknowledgement as described below. Non-CZO data products — like those produced by USGS or NOAA — have their own use policies, which should be followed.

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    *CZO Data Products.  Defined as a data collected with any monetary or logistical support from a CZO.

    **Private. Most private data will be released to the public within 1-2 years, with some exceptionally challenging datasets up to 4 years. To inquire about potential earlier use, please contact us.

  • Data Sharing Policy

    DRAFT v.0.2.5

    All CZO investigators and collaborators who receive material or logistical support from a CZO agree to:

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    * CZO Data Products. Defined as data collected with any monetary or logistical support from a CZO. Logistical support includes the use of any CZO sensors, sampling infrastructure, equipment, vehicles, or labor from a supported investigator, student or staff person. CZO Data Products can acknowledge multiple additional sources of support.

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    † Dataset Creators. Defined as the people who are responsible for designing, collecting, analyzing and providing quality assurance for a dataset. The creators of a dataset are analogous to the authors of a publication, and datasets should be cited in an analogous manner following the emerging international guidelines described at http://www.datacite.org/whycitedata.

  • Overview Maps

    Map Showing locations of Samplings of Didymosphenia Geminata

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CZO Field Areas

 


CZO Authors