Hopkins Marine Station Student Paper

Browse Titles | Search Citations & Abstracts

(full paper is archived in the Miller Library)

Title: Effects of DDT on action potential discharge in the nerves of the sand crab, Emerita analoga (Simpson)
Student Author(s): Kroener, John M.
Faculty Advisor(s): Mpistos, George
Pages: 21
Location: Final Papers Biology 175H
Date: June 1971
Keywords: marine pollution
Abstract: Large motor abberations were observed in the sand crab, Emerita analoga, allowed ot concentrate DDT from seawater to 1.4 ppm. This is close to some levels found in the field. In recordings made form a nerve innerviating the abdominal flexor muscles, 1 ppm DDT in the bathing medium greatly increases spontaneous neuronal bursting, length of tactually stimulated bursts and frequency of firing of the larger motor neurons. These effects appear cumulative and irreversible. Animals bathed in 100 ppb DDT and animals with 1.4 ppm DDT taken up over 12 days showed lesser but similar neurophysiological effects. Behavioral effects at concentrations found in the natural environment is deemed possible.