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Acute and long-term toxicities of 2 low molecular weight polycyclic aromatic hydrocarbons (PAHs) and 2 organochlorine pesticides on bacterial growth were assessed, using incorporation of tritiated thymidine (13H]TdR) into bacterial cell macromolecules as growth indicator of natural populations of coastal bacterioplankton. Acute toxicity of the 4 compounds increased in the following order: naphthalene < phenanthrene < Kepone = pentachlorophenol (PCP), the minimum significantly inhibiting concentrations (p < 0.05) being 1 mg I-' , 100 yg 1-l , 100 pg I ' , and 10 yg I-' , respectively. Comparisons with a past study on sediment microorganisms from a salt marsh near the sampling site (near New York, USA) used here indicate that bacterioplankton are more susceptible to organic pollutants than are sediment bacteria. In the long-term studies, total bacterioplankton activity recovered from lOmg 1-' naphthalene, 100pg l-' phenanthrene, and 1 mg 1-' Kepone after 1 d, whereas recovery from 1 mg 1-' PCP required 3 d. Recovery could have been due to adaptation of individuals or selective growth of resistant bacteria. Some of the population effects we observed could have been due to toxic effects on eukaryotic grazers that usually keep bacterial populations in check. It is concluded that of the 4 pollutants studied, PCP poses the greatest potential threat to manne bacterioplankton populations.

Effects of four organic pollutants on the growth of natural marine bacterioplankton populations