DDT Reduces Photosynthesis by Madne Phytoplankton

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Science  29 Mar 1968:
Vol. 159, Issue 3822, pp. 1474-1475
DOI: 10.1126/science.159.3822.1474


Concentrations of DDT [1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane] as low as a few parts per billion in water reduced photosynthesis in laboratory cultures of four species of coastal and oceanic phytoplankton representing four major classes of algae, and in a natural phytoplankton community from Woods Hole, Massachusetts. Toxicity to diatoms increased as cell concentration decreased. This inhibition may be of ecological importance.