Figure from Detection of ultraviolet radiation induced DNA damage in microbial communities of the Gerlache Strait

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Figure 1. Depth profiles of UV-B-induced DNA damage in bacterioplankton in the Gerlache Strait on a calm day with low ozone concentrations (5 November 1995). Samples were collected via a submersible pump suspended at fixed depths from a buoy at sunrise (a.m.) and again at 1800 hours (p.m.). Water was prefiltered through a 0.8-m-pore Nuclepore cartridge and the filtrate collected onto a 0.2-m-pore filter for DNA damage analysis. The net amount of damage may be considered to be the difference between the p.m. and a.m. samples. Significant damage was observed in the surface water and could be detected to 20 m, deeper than usually detected, suggesting that low ozone may indeed produce greater impact in the water column on calm days.