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Journal of Plankton Research, Vol 21, 373-385, Copyright © 1999 by Oxford University Press

ORIGINAL ARTICLES

Temporal and vertical dynamics of phytoplankton net growth in Castle Lake, California

P Huovinen, M Brett and C Goldman
Department of Environmental Science and Policy, University of California, Davis, CA 95616, USA; Present address: University of Jyvaskyla, Department of Biological and Environmental Science, PO Box 35, FIN-40351 Jyvaskyla, Finland; Present address: Department of Civil and Environmental Engineering, University of Washington, Box 352700, Seattle, WA 98195, USA

The impact of nutrient additions, zooplankton grazing and light intensity on phytoplankton net growth with depth and season was studied with five microcosm experiments in meso-oligotrophic, subalpine Castle Lake, California, during the period of summer stratification in June-September 1994. The incubations (4 day) were performed at 5 m intervals from the surface to the bottom using natural phytoplankton and zooplankton assemblages, with enrichments of phosphorus and nitrogen. The phytoplankton community was only limited by nutrients in the upper 5 m (epilimnion), as indicated by change in chlorophyll concentration. Nutrient enrichments had the greatest effect on the phytoplankton net growth in June and July. High light inhibited the phytoplankton net growth at the surface. Low light intensities limited phytoplankton at 20 m and below, and at the end of the growing season already around 10-15 m. A deep chlorophyll maximum in the hypolimnion in June-August was not limited by either light or nutrients. The results showed variation in grazers' impact on phytoplankton. These results suggest the importance of nutrient limitation only in the epilimnion with light inhibition at the surface, light limitation in the hypolimnion, and varying impact of zooplankton grazing in influencing the development of the phytoplankton in Castle Lake.
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