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Primary production in 10 reservoirs in southern brazil


, : Primary production in 10 reservoirs in southern brazil. Hydrobiologia 122(1): 81-88

The phytoplankton primary production of 10 reservoirs in Sao Paulo Sate was measured using the 14C method. Production rates, depth profiles and integral productivity were analyzed with respect to chlorophyll a data and various abiotic environmental factors. Productivity was low (except in Americana Reservoir), and peaked in summer. Maximum production rates in the depth profiles ranged 0.8-160.3 mgCm-2 h-1. Nanoplankton was responsible for most of the primary production. Nutrients (especially P) were the principal factors limiting production but turbidity was often critical during winter (monomictic reservoirs) and at other times (polymictic examples).

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