Variability in Microbiological Data from a Stratified Eutrophic Lake |
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Authors: | J G JONES B M SIMON |
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Institution: | Freshwater Biological Association, The Ferry House, Ambleside, Cumbria LA22 OLP, U.K. |
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Abstract: | A survey of a stratified eutrophic lake was undertaken to determine the degree of variability in direct counts of bacteria, electron transport system activity, ATP concentration, chlorophyll a concentration and chemiluminescence, in the water column and the sediment. Heterogeneity in the horizontal and vertical dimension was studied in detail and the scale of variability was compared with within-sample and between-sample errors, and with seasonal fluctuations. Variability was greater in the sediment samples, and the coefficient of variation of samples taken at a single site was often as large as that between sites in a transect across the lake. Although this was not an exhaustive survey, the values provided should allow rough estimates to be made of the number of samples required to achieve a given level of precision in future investigations. |
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