Term of Award
1977
Degree Name
Master of Science in Biology
Document Type and Release Option
Thesis (restricted to Georgia Southern)
Department
Department of Biology
Committee Chair
Sturgis McKeever
Committee Member 1
William Dunster
Committee Member 2
Frank E. French
Abstract
Mysid shrimp, Neomysis americana Smith, were subjected to long term exposure of low concentrations of cadmium under dynamic conditions to determine changes in tissue cadmium or zinc concentrations. No appreciable accumulation was detected. However, this may be a reflection of the limitations of the analytical method used to determine cadmium and zinc concentration levels. Other groups of mysids were exposed to cadmium and zinc under static conditions to evaluate the extent of relative toxicity of each metal. Comparative 24 hour LC50 (concentration lethal to 50% of the population within 24 hours) values derived by multiple regression indicated relative toxicity of cadmium to zinc to be at an approximately 10:1 ratio (cadmium 24-hour LC50 = 82.30 ug/L; zinc 24-hour LC50 = 872.93 ug/L). The cadmium LC50 line exhibited a greated negative slope than the zinc LC50line, indicating a greater toxicity of cadmium. Also, curvalinearity of the regression lines indicated factors more complex than simple replacement or competition for sites on a specific protein effect the bioassays at higher concentration levels, the result being a greater toxicity of cadmium. Metal bioassays of both the dynamic and the static types of marine systems may be unsuitable for precise quantitative determinations of LC50 values due, at least in part, to the highly ionic environment.
OCLC Number
1034690954
Catalog Permalink
https://galileo-georgiasouthern.primo.exlibrisgroup.com/permalink/01GALI_GASOUTH/1r4bu70/alma9916059193802950
Copyright
To obtain a full copy of this work, please visit the campus of Georgia Southern University or request a copy via your institution's Interlibrary Loan (ILL) department. Authors and copyright holders, learn how you can make your work openly accessible online.
Recommended Citation
Willis, John A., "the Toxicity of Cadmium and Zinc to the Mysid Shrimp, Neomysis americana Smith (Crustacea: Mysidacea)" (1977). Legacy ETDs. 354.
https://digitalcommons.georgiasouthern.edu/etd_legacy/354