(full paper is archived in the Miller Library)
Title: The effects of sublethal concentrations of DDT on the rates of filtering and respiration of Mytilus claifornianus
Student Author(s): Shultis, Susan A.
Faculty Advisor(s): Abbott, Donald
Location: Final Papers Biology 175H
Date: June 1969
Abstract: Mytilus californianus maintained in solutions of filtered seawater of 1.0, 0.1,0.01, and 0.001 ppb DDT showed no consistent change in rate of respiration or filtering. Mytilus fed on Nitzschia in a 1 ppb DDT solution increased the level of DDT in the soft tissues to 562 (range 29 - 911) ppb in 24 hours; to 880 (range 451 - 1358) ppb in 48 hours; to 1253 (range 390 - 2056) ppb in 72 hours; and to 1307 (range 641 - 2692) ppb in 96 hours. Measurements of respiration and filetering rates taken of subsamples of the test group at 24 hour intervals showed no significant difference between the test organisms exposed to DDT and the controls. Mytilus californianus can concentrate DDT in its soft tissues up to 2.7 ppm by wet weight with no apparent reduction in the rates of filtering or respiration.