Abstract
We examined spatial variation in daytime drift density of Baetis larvae collected from 42 habitat patches in Clearwater Creek, southwest Washington, USA. Drift density ranged between 22 and 525 100 m-3. Variation in drift density appeared to be inversely related to current velocity, although only weakly. Drift density showed no relationship with substrate size, time of day (daylight hours only), length of sampling interval, or size of substrate patch sampled. Although significant variation in drift density can occur within relatively short reaches of stream the mechanisms promoting observed variation are not well understood.
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