Cooperative Fish and Wildlife Research Units Program: Texas
Education, Research and Technical Assistance for Managing Our Natural Resources

Texas Project

Effects of Glyphosate-Based Herbicide, Roundup, on Harmful Golden Alga (Prymnesium parvum) Growth

January 2017 - June 2018


Participating Agencies

  • Texas Tech University

Glyphosate-based herbicides (GBHs) are the most widely used herbicides in the USA and worldwide. Previous studies have documented tolerance to glyphosate by certain algae but data available are insufficient for generalizations. This study was partially funded by university funds in support of B. Dabney's MS thesis research. Results showed that glyphosate and GBHs stimulate growth the harmful alga, Prymnesium parvum, at environmentally relevant concentrations. Management of P. parvum blooms may therefore need to consider the potential contribution to bloom formation by glyphosate-contaminated runoff in areas where GBHs are being used or by the direct aquatic application of GBHs for the control of nuisance macrophytes.

Research Publications Publication Date
Dabney, B, Patiño, R. 2018. Low-dose stimulation of growth of the harmful alga, Prymnesium parvum, by glyphosate and glyphosate-based herbicides. Harmful Algae 80, 130-139 | Abstract November 2018
Theses and Dissertations Publication Date
Dabney, B. 2018. Hormetic effects of glyphosate and glyphosate-based herbicides on growth of Prymnesium parvum, a harmful alga. MS Thesis, Texas Tech University. August 2018