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Use of Modified Diurnal Curves for the Measurement of Metabolism in Standing Water

Harold E. Welch
Limnology and Oceanography
Vol. 13, No. 4 (Oct., 1968), pp. 679-687
Stable URL: http://www.jstor.org/stable/2834101
Page Count: 9
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Use of Modified Diurnal Curves for the Measurement of Metabolism in Standing Water
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Abstract

A modification of diurnal oxygen curves is described, whereby community metabolism can be easily estimated from a succession of twice-nightly points. The method can be adapted to stratified limnetic waters by using suitable sampling techniques. Results of a study using the method are given for a small, fertile Georgia farm pond. Gross photosynthesis averaged 6.0 g O2 M-2 day-1, ranging from 1.0 to 14 g O2 m-2 day-1. The approximate net loss of oxygen due to diffusion was 101.1 g O2 m-2 yr-1, less than 5% of total gross photosynthesis.

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