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JOURNAL OF PLANKTON RESEARCH | VOLUME 11 | NUMBER 3 | PAGES 583-593 | 1989
© Oxford University Press

research-article

Does the chlorophyll a content of phytoplankton vary with trophic status in lakes on the New Zealand central volcanic plateau?

Rick D. Pridmore, Judi E. Hewitt and A.Bryce Cooper

Water Quality Centre, Department of Scientific and Industrial Research PO Box 11–115, Hamilton, New Zealand

Received on October 4, 1988; accepted on January 31, 1989 Recently, it has been shown that ratios of chlorophyll a to particulate phosphorus (Chl a/PP) and chlorophyll a to particulate nitrogen (Chl a/PN) were significantly higher in eutrophic than oligo/mesotrophic waters in 17 lakes on the central volcanic plateau, North Island, New Zealand. This difference was thought to be due to an increase in the chlorophyll a content of phytoplankton in these eutrophic lakes. Corresponding measurements of chlorophyll a and phytoplankton cell volume made during this study do not support this hypothesis. However, ratios of chlorophyll a to adenosine triphosphate and estimates of percentage phytoplankton biomass were significantly higher (P<0.05) in our eutrophic than oligo/mesotrophic samples, suggesting that Chl a/PP and Chl a/PN may be high in eutrophic waters simply because phytoplankton comprise more of the total microbial biomass. This hypothesis is supported by a strong linear relationship (r=0.88, P<0.001) between Chl a/PP and percentage phytoplankton biomass in six of our study lakes where corresponding measurements were made.


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