Hopkins Marine Station Student Paper

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(full paper is archived in the Miller Library)

Title: Inhibition of the photsynthetic process in marine phytoplankton by DDT and its derivatives
Student Author(s): Bailey, Susan Anne
Pages: 31
Location: Final Papers Biology 175H
Date: June 1969
Keywords: DDT
Abstract: DDT inhibits photosynthesis in natural populations of marine phytoplankton at levels as low as 10ppb, and reduces it to 5% of the normal rate at 1ppm. The rate of photosynthesis/unit chlorophyll A decreased with increasing concentration of DDT, with a corresponding increase in the rate of respiration. In exponentially growing cultures, the rate of chlorophyll A synthesis decreases with increasing concentration of DDT. DDE, the most common analog of DDT in the environment, inhibits photosynthesis at much lower concentrations, and to a greater extent, than DDT.