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Controlled Ecosystem Pollution Experiment (CEPEX)

CEPEX was originally conceived as an international programme involving scientists from the United States, the United Kingdom, and Canada. It was organized as part of the International Decade of Ocean Exploration (IDOE), and its general purpose is to obtain an understanding of the chronic low-level effects of pollutants on the marine environment. In order to examine these effects, it was decided that large-scale experiments had to be performed in which isolated bodies of sea water were studied over periods of time long enough to observe the total effect of a pollutant on the whole food-chain in the sea. Previous experiments involving the isolation of large volumes of sea water have been discussed in the literature (e.g. Strickland & Terhune, 1961). In the CEPEX programme, a major departure from all previous designs is in the size of the containers to be used to hold a column of sea water. In order to accommodate at least three trophic levels, from phytoplankton through to fish, the polyethylene 'bags' are to measure ea 10 m in diameter by 30 m deep, and are hence to contain ca 2,500 tonnes of sea water each (Fig. 1, in which the diving figures below on left give scale). Initial experiments have commenced using 14 -scale models of the final containers; these can be employed to study the effects of pollutants on at least two trophic levels.