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It is possible to make statistically significant comparative measurements of similar sections of subestuaries under conditions where the large natural variations would mask all but drastic changes in the systems if they were studied individually. The comparative study is proposed as a modification to the baseline study of a single system for the assessment of the effects of man’s activities in an estuary. We have made temporally coincident measurements of phytoplankton production, standing crops and a range of physical and chemical parameters in comparable sections of the Rhode and West rivers and in an adjacent section of the Chesapeake Bay for the 3-year period 1970–1972. We analyzed the data for standing crops and demonstrated that at least at the trophic level of phytoplankton, the judicious application of a paired comparative sampling protocol to the Rhode and West rivers is superior to a study of either system alone. We calculate that the paired comparison sampling protocol requires approximately one tenth the sample size of the single-system sampling technique to achieve the same significance level.

chesapeake science

Growth and Dissipation of Phytoplankton in Chesapeake Bay. II. A Statistical Analysis of Phytoplankton Standing Crops in the Rhode and West Rivers and an Adjacent Section of the Chesapeake Bay