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Effects of glyphosate exposure, nutrient loading, and temperature on the population growth rates and cellular sizes of Chlorella vulgaris and Microcystis aeruginosa.

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Title: Effects of glyphosate exposure, nutrient loading, and temperature on the population growth rates and cellular sizes of Chlorella vulgaris and Microcystis aeruginosa.
Author: Shaw, Nicola
Department: Department of Integrative Biology
Program: Integrative Biology
Advisor: Fryxell, John
Abstract: Cyanobacterial-harmful algal blooms (CHABs) are on the rise globally, threatening aquatic ecosystems and public health. CHABs may be stimulated by high temperature caused by global warming and high levels of nutrients and glyphosate-based herbicides from agricultural runoff. The objective of this study is to investigate the sublethal effects of glyphosate and nutrient loading on cyanophytes and chlorophytes at different temperatures. I exposed cyanophyte, M. aeruginosa, and chlorophyte, C. vulgaris, to a range of glyphosate (1-12.1mg/L) and fertilizer (85.01[N]:8.71[P]-679.01[N]:138.63[P]mg/L) concentrations at 15, 20, and 25℃ for 26 days. Glyphosate did not affect population growth rates in either species, but decreased cell size in C. vulgaris and increased cell size in M. aeruginosa. Increases in fertilizer concentration and temperature enhanced population growth of only M. aeruginosa. These findings suggest that climate change and the elevated agricultural use of glyphosate and fertilizer may promote cyanobacteria and CHABs at the expense of chlorophytes.
URI: https://hdl.handle.net/10214/21226
Date: 2020-09
Rights: Attribution-NoDerivatives 4.0 International
Terms of Use: All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.


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Attribution-NoDerivatives 4.0 International Except where otherwise noted, this item's license is described as Attribution-NoDerivatives 4.0 International