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Influence of Environmental Variables on Growth of Toxigenic Golden Alga (Prymnesium parvum): A Laboratory Test of Field-Generated Hypotheses


July 2015 - May 2020


A considerable amount of information is available concerning the primary environmental factors associated with toxic blooms of golden alga. This information is largely descriptive. The purpose of this study is conduct tests of hypotheses generated by field projects under controlled conditions in the laboratory. This study is being funded by intramural university sources in support of the PhD dissertation research of R. Rashel. The information obtained is expected to reveal causal associations between specific environmental variables and golden alga growth. This knowledge will be useful in efforts to anticipate and manage toxic blooms of this species.

Research Products and Activities

Peer Reviewed Publications

  • Rashel, R., Patiño, R. 2017. Influence of genetic background, salinity, and inoculum size on growth of the itchthyotoxic golden alga (Prymnesium parvum). Harmful Algae 66: 97-104.
  • Rashel, R.H. and Patiño, R. 2019. Growth response of the ichthyotoxic haptophyte, Prymnesium parvum Carter, to changes in sulfate and fluoride concentrations. PloS One 14(9): e0223266. Publisher Website | 


  • Rashel, R. Patiño, R. 2015. Influence of salinity, sulfate, and fluoride on growth of Golden Alga. Annual Conference, Texas Tech University Association of Biologists, Lubbock, Texas.
  • Rashel, R.H., Patiño, R. 2015. Influence of Salinity, Sulfate, and Fluoride on Growth of Golden Alga. 145th Meeting of the American Fisheries Society, Portland, Oregon.
  • Rashel, R., Patiño, R. 2016. Influence of salinity and other water quality variables on growth of the ichthyotoxic golden alga. Texas Chapter of the American Fisheries Society, Kerrville, Texas
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Current Staff

Federal Staff: 2

Masters Students: 6

Phd Students: 3

Post Docs: 1

University Staff: 2

5 Year Summary

Students graduated: 43

Scientific Publications: 68

Presentations: 159



Funding Agencies

  • Texas Tech University


Texas Cooperative Fish and Wildlife Research Unit Cooperators

  1. Texas Parks and Wildlife
  2. Texas Tech University
  3. U.S. Fish and Wildlife Service
  4. U.S. Geological Survey
  5. Wildlife Management Institute