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JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 7 | PAGES 891-906 | 1997
© Oxford University Press

research-article

Nutrient limitation in relation to phytoplankton carotenoid/chiorophyll a ratios in freshwater mesocosms

Louise Schitüter, Bo Riemann1 and Morten Søndergaard2

The International Agency for 14 Determination, VKI Water Quality Institute Agern Allé 11, DK-2970 Hørsholm, Denmark 1Present address: National Environmental Research Institute, Department of Marine Ecology and Microbiology PO Box 358, DK-4000 Roskilde 2Freshwater Biological Laboratory, University of Copenhagen Helsingørsgade 51, DK-3400 Hillerød, Denmark

Received on July 13, 1996; accepted on February 26, 1997 The 480/665 nm absorption ratio for pigment extracts was evaluated as an indicator of nutrient limitation using freshwater plankton communities and a mesocosm approach. The mesocosm design was used to create various nutrient regimes for the phytoplankton communities, and nutrient limitation was detected by means of growth response assays (14 fixation and pigment increase following addition of nutrients) and the 480/665 ratio. Results from four periods in 1993 and one period in 1994 showed that high 480/665 ratios (indicative of nutrient limitation) were only found at chlorophyll a concentrations <20 µg I–1, where nutrient limitation was not detected. Periods with potential nutrient limitation exhibited low 480/665 ratios. Consequently, the absolute values of the 480/665 ratio could not be used to predict nutrient limitation. However, when nutrients were added to nutrient- limited phytoplankton communities in growth response assays, the ratio decreased, indicating that the 480/665 ratio can be used as a relative index to detect nutrient limitation in bioassays.


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