Date of Award
Honors College Theses
Dr. Joyce W. O'Rourke
Dr. Beverly Wade
Glyphosate (Roundup) is one of the most commonly used broad spectrum herbicides used with little to no toxicity to higher animals or the environment (Smith and Ochme, 1992). Due to its widespread use, there is a continuous contamination of the environment in both soil and water, with this herbicide. This study was developed to determine the effects of sublethal concentrations of glyphosate on development and survivability of Pseudosuccinea columella snails (intermediate host of Fasciola hepatica). This was assessed by acutely exposing third generation snails to varying concentrations (0.01-1ppm) of glyphosate. The snails were kept on artificial spring water to which doses of glyphosate were added and the laboratory in which water temp (22-25 0C) and photoperiod (approx. 12 hours of light) were unregulated. Abnormalities and polyembryony were observed in snails exposed to 0.01 and 0.1 ppm glyphosate. The results did not indicate that glyphosate affects the snails reproductivity and embryo development. The difference in generations used may play a factor in the fluctuation with these results. Hopefully in further experimentation, it may be proven that glyphosate affects the egg-laying capacity of Pseudosuccinea columella snails. This in turn, may influence the rate of infection of Fasciola hepatica in higher animals (mammals).
Osborn, Ambika N., "The Effect of Acute Exposure to Glyphosate on Reproductive Potential and Embryo Development of Pseudosuccinea Columella Snail" (1999). Electronic Dissertations and Theses. 95.