Date of Award:
5-1-1981
Document Type:
Dissertation
Degree Name:
Doctor of Philosophy (PhD)
Department:
Biology
Department name when degree awarded
Life Sciences:Biology
Committee Chair(s)
Raymond I. Lynn
Committee
Raymond I. Lynn
Committee
John O. Evans
Committee
Charles W. Fowler
Committee
Vincent A. LaMarra
Committee
Donald A. Porcella
Committee
Fred W. Post
Abstract
The direct effects of simazine, an s-triazine herbicide, upon the green alga, Chlamydomonas reinhardii; and the invertebrate, Daphnia pulex, were studied by exposure of both organisms to different concentrations of simazine over long time periods. The effects of simazine upon growth and reproduction in Daphnia pulex were evaluated using both C. reinhardii and mixed bacterial culture as a food source. A simulation model was developed to assess the effects of simazine introduction into natural aquatic systems. Simazine in concentrations of 0.5ppm and above was shown to inhibit growth in cultures of C. reinhardii. Daphnia pulex reproduction and growth increased as simazine concentration increased when C. reinhardii was used as a food source. Reproduction was depressed at the higher levels of simazine when compared to controls without simazine when mixed bacterial cultures were used as food sources. Simulation results indicated that the introduction of simazine into natural aquatic systems could have adverse impacts upon overall productivity of the system if residence time of the herbicide was long.
Recommended Citation
Carter, John Gerald, "Effects of the Herbicide Simazine Upon Production in a Two Member Aquatic Food Chain" (1981). Biology. 467.
https://digitalcommons.usu.edu/etd_biology/467
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