Conclusion 



The complexity of assessing the impact of pollutants on the marine 

 biota was recognized by all of the program scientists. It was agreed 

 that significant cases of lethal and sublethal biological effects had been 

 observed. The problem of using this knowledge to evaluate environ- 

 mental impacts for real ecosystems was known to all the participants. 

 Nevertheless it is generally concluded that at some point many small 

 cases of damage to organisms will result in significant damage to the 

 marine ecosystem. Because we are not yet able to say how many small 

 events add up to a major one it was urged that care be taken to pro- 

 tect the environment from toxic substances. 



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