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JOURNAL OF PLANKTON RESEARCH | VOLUME 12 | NUMBER 2 | PAGES 381-396 | 1990
© Oxford University Press

research-article

Optical assessment of phytoplankton nutrient depletion

M.R. Heath, K. Richardson1 and T. Ki{pi}rboe1

DAFS Marine Laboratory PO Box 101, Victoria Road, Aberdeen AB9 8DB, UK 1Danish Institute for Fisheries and Marine Research Charlottenlund Castle, DK-2920 Charlottenlund, Denmark

Received on May 2, 1989; accepted on November 22, 1989 The ratio of light absorption at 480 and 665 nm by 90% acetone extracts of marine phytoplankton pigments has been examined as a potential indicator of phytoplankton nutritional status in both laboratory and field studies. The laboratory studies demonstrated a clear relationship between nutritional status (carbon/nitrogen ratio) and the absorption ratio that was independent of light and temperature climate. The absorption ratio for nutrient-replete cells was shown to vary between taxonomic groups. However, the inter-specific variation was less than the differences observed between nutrient-replete and nutrient-depleted cells. The field data suggest that the absorption ratio may be a useful indicator of nutritional status of natural phytoplankton populations, and can be used to augment the interpretation of other data.


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