Bottom samples were taken throughout the year at 1600 and 2300 hours from a riffle region of a brown‐water stream of Alberta, Canada. For the abundant taxa, the variance of numbers was much greater than the mean for both day and night samples. For the entire study period, there were no significant differences between day and night samples for total numbers, total number of taxa, and total volume‐biomass.
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Hugh F. Clifford (1972) studied this question.