The similarity in the behaviour of the microcosms and Narragansett Bay 
gives some confidence that these systems will be good experimental tools lor 
ecological and biogeochemical experiements. 
ACKNOWLEDGMENTS 
This work was supported by grant No. R803902020 from the 
Environmental Protection Agency. We thank Ann and Ted Durbin for allowing 
us to use their phytoplankton counts and zooplankton biomass data in Figures 
24-4 and 24-9, and Scott Nixon for helpful discussion. 
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