Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: The accumulation and transport of DDT residues in the lined shore crab, Pachygrapsus crassipes (Randall, 1839)
Student Author(s): Hansen, Chris B.
Faculty Advisor(s): Lee, Welton
Pages: 25
Location: Final Papers Biology 175H
Date: June 1969
Keywords: DDT
Abstract: The aims of this study were twofold: 1) to find the natural levels of DDT residues in a selected marine invertebrate, noting individual variations, as well as variation with respect to locality, age, sex, and type of tissue; and 2) to map the pathway after ingestion of labelled DDT through the body of the same organism. The lined shore crab, Pachygrapsus crassipes, was studied, since preliminary investigations suggested it was accumulating significant ammounts of DDT. This study indicates that excretion may play a decisive role in maintaining some sort of DDT level equilibrium between an organism and its environment. If this is indeed true, the present theory of pesticide accumulation through food chains may have to be re-evaluated.