Abstract
Abstract The relationship between measurements of phytoplankton cell volume (CV) and chlorophyll a (Chla) in the near surface waters (1 m) of 12 North Island lakes was investigated between January and December 1982 to determine the usefulness of Chla as a biomass indicator. A strong linear relationship was obtained between the two parameters (F = 262, n = 131) which explained 66% of the variation. There was a distinct seasonal trend, however, in the amount of chlorophyll a measured per unit algal cell volume (Chla/CV). Values of Chla/CV ranged between .1.9 and .12.4 μg.mm-1 and were generally high dunng the wlO.ter (interquartile range 6.6-10.5, n = 33) and low dunng the summer (interquartile range 2.8-3.9, n = 47). When this effect was taken into account, the explanatory power of the Chla-CV relationship increased to 78%. This relationship was not significantly affected by changes in phytopla~kton taxonomic composition (i.e., Bacillariophyceae Chlorophyceae, Dinophyceae), and reliably predicts either Chl...
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