An Ordination of Phytoplankton Populations in Ponds of Varying Salinity and Temperature

Phytoplankton populations and hydrographic variables in two transient beach ponds and nearby Long Island Sound, New York, were observed from June 1967 through November 1968. Various indices of sample similarity are discussed, and a measure of taxa content similarity having certain desirable features was calculated for all pairs among 70 samples. This set of relations was used to construct a three—dimensional ordination. Two of the resulting principal axes are seen to be related to salinity and temperature. In these projections, no separate clusters of points are seen that would suggest that the taxa observed belong to well—defined, mutually exclusive communities with respect to salinity or temperature.

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