Abstract
Abstract The seasonal successions of phytoplankton in Onondaga Lake during 1975–77 were generally similar to the 1973–74 period immediately after the reduction in phosphorus entering the lake. Diatoms and flagellates were dominant in spring and replaced in importance by chlorococcalean green algae and the diatom Cyelotellaglomerata during summer. A die-off of summer algae was observed in 1977. During the summer, silica was depleted in the epilimnion by diatom growths and phosphorus by chlorococcalean green algae. Enrichment studies indicated that availability of phosphorus to green algae and silica to diatoms may have contributed to determining their periods of dominance. Blue-green algae continued to be relatively unimportant in the plankton, in contrast to the conditions before 1972 when they caused late summer blooms.
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