Abstract
A synoptic survey of Green Bay was undertaken in mid‐July 1970 to determine the horizontal distribution of major species of planktonic diatoms.Principal component analyses of R‐correlation and covariance matrices, and four methods of factor analysis described a general bipolar axis which grouped Melosira granulata, Stephanodiscus spp., Cyclotella meneghiniana, and Stephanodiscus niagarae at one pole and Fragilaria crotonensis, Asterionella formosa, Tabellaria flocculosa, and Cyclotella comta at the opposite pole.Cluster analysis of diatoms defined one major group, which predominated in the extreme southern part of the bay, as certain centric species plus the araphid Fragilaria capucina. Two other groups, consisting primarily of other araphids and species of the genus Cyclotella, characterized the rest of the bay.Cluster analysis of 68 stations, based on distribution of diatoms, divided the bay into three major areas: extreme southern Green Bay, southern and eastern Green Bay, and northern and western Green Bay.
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