DDT Residues in Marine Phytoplankton: Increase from 1955 to 1969

Science  02 Oct 1970:
Vol. 170, Issue 3953, pp. 71-73
DOI: 10.1126/science.170.3953.71


Phytoplankton samples collected in Monterey Bay, California, from 1955 to 1969 contained compounds identified as p,p'-DDT, p,p'-DDD, and p,p'-DDE. Total concentrations of these compounds were approximately three times greater in the later samples. Lower concentrations throughout the period were associated with higher densities of standing crop.