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NET PLANKTON AND NANOPLANKTON PRODUCTION AND BIOMASS IN A NORTH TEMPERATE ZONE LAKE
Author(s) -
Kalff J.
Publication year - 1972
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1972.17.5.0712
Subject(s) - plankton , biomass (ecology) , eutrophication , phytoplankton , environmental science , temperate climate , trophic state index , zooplankton , diatom , algae , biology , zoology , ecology , nutrient
In a small, naturally eutrophic lake with annual phytoplankton production rates of about 82 and 78 g C/m 2 in 1966 and 1967, daily production ranged from undetectable levels to about 1,100 mg C/n 2 , and the epilimnetic biomass between 21 mg/m 3 and 1,232 mg/m 3 . Selective filtration showed that on an annual integrated basis between 75 and 79% of the production in both years was synthesized by the nanoplankton (<64 µ m). About half of the annual photosynthate in 1967 was produced by organisms <20 µ m. The net plankton (>64 µ m) contributed more than half of the recorded epilimnetic biomass on one occasion but never more than half the daily production. The conspicuous blue‐green alga‐diatom complex that characterized the lake during stratification was photosynthetically inefficient as compared to the nanoplankton.