The impact of 3 low level copper sulfate applications to Cazenovia Lake, New York [USA] was assessed through a high frequency monitoring program. Monitored parameters included filtered and total Cu; phytoplankton identification and enumeration; chlorophyll a, in situ 14C assimilation; bacteria numbers; zooplankton identification and enumeration, macrophyte nutrient status and filtered reactive and total P. The low level application caused only small increases (maximum of 5 .mu.g/l) of short duration (2-5 days) in filtered Cu. The treatments failed to induce effective algicidal action in the target phytoplankton populations of the lake, but they did induce short term stress and alterations in the natural seasonal succession processes within these populations. No definitive responses in the zooplankton, submerged macrophytes or water column P levels were noted. Dramatic reductions in the water column bacteria occurred immediately following each treatment, indicating direct negative impact. Phytoplankton and bacteria populations recovered within 1 wk and several days, respectively.
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