Phytoplankton community photosynthesis and primary production in a hypereutrophic lake, Lake Apopka, Florida

摘要: A study of in situ primary productivity (light- and dark-bottle oxygen exper- iments) was conducted biweekly 1990 1991 to measure volumetric rates phytoplankton photosynthesis estimate integral production. Concurrently, ambient conditions including water temperature, photosynthetically active radiation (PAR), Secchi disc transparency, dissolved biomass (chlorophyll- a) were measured. Results both light- experiments are used 1) demonstrate that Lake Apopka is not hetero- trophic as reported the literature, 2) provide preliminary estimates production, 3) discuss shortcomings experimental methodology 4) evaluate sources temporal variability No strong seasonal patterns found physical chemical with exception temperature. Whole-basin net organic carbon sedi- mentation an independent approach pro- duction. The magnitude production ranged from approximately 1 2gCm -2 d -1 for three direct 3 5gC m indirect method. We conclude short-term controlled mainly by meteorological forcing wind-induced turbulence resuspen- sion meroplankton. Our shows obtaining precise accurate esti- mates more complex than might be anticipated application standard techniques.