Efficiency estimates of a stream Benthos suction sampler

Abstract

The efficiency of a modified Boulton suction sampler was tested in 2 riffle zones, using multiple removals. Macroinvertebrate fauna was sampled with approximately 70% efficiency on first removal, while organic matter was sampled with 55% efficiency. Sampling efficiencies for specific taxa ranged from 86% (Plecoptera) to 66% (Chironomidae) and 59% (Trichoptera). The results of this study indicate that sampling efficiency can be improved either by taking multiple samples at one location or by increasing the time spent disturbing the substratum and pumping water from the stand pipe. The results also indicate the importance of conducting pilot studies to determine the efficiency of a sampler at sites where the efficiency is likely to be different.