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Species composition, abundance and seasonal variations of benthic macroinvertebrates in Simmons Bayou, Mississippi, and an adjoining deadend canal were investigated from July 1976 through June 1977. Cluster analysis of the data summed over five stations indicated four major time periods: July, August -November, Dccember-February, and March-June. Polychaetes and oligochaetes were most abundant in the winter and spring, amphipods in the summer, and chironomids in the spring. Temporal changes in abundance of polychaetes, oligochaetes, and chironomids appeared to reflect seasonal reproductive cycles. The peak in amphipod density correspondcd with dense growths of Ruppia maritima. Within the deadend canal, poor water quality and reduced infaunal densities appeared to be limitcd to the deeper water behind the sill.

Macrobenthos of Simmons Bayou and an Adjoining Residential Canal