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community accurately at a given station. One sample per station costs less <br /> but has little value for aquatic habitat assessment , one never knows if <br /> f <br /> or an average of <br /> such single samples represent the best, the worst ' <br /> possible conditions at the sampling site. Also as a side benefit, three I <br /> samples per station provides a basis for various statistical analyses, if <br /> random samples are all taken from a rubble substrate in as similar habitat <br /> as possible, taking into account mainly the velocity of flow and depth in ` <br /> the stream. Biologists have found that compared to other sampling devices, <br /> the Winget—modified surber net yields the highest coefficient of - <br /> correlation (similarity of samples) . _ <br /> 4 f <br /> potential for p i <br /> streams natural p productivity, habitat quality and <br /> A „ �� b quantitative <br /> water quality can be compared to the actual y taking q <br /> samples of aquatic macroinvertebrates. Careful analysis of <br /> macro invertebrate communities can reveal condition and trends in aquatic <br /> ecosystems. Sampling and analysis is conducted in accordance with <br /> procedures outlined in FSH R-4 2609.23 , March 1985 , Fisheries Habitat <br /> Surveys Handbook. <br /> This report is based upon 114 aquatic macro invertebrate samples from <br /> twenty stations on ten streams, along with the physical habitat and water <br /> chemistry data provided by your aquatic specialists. Various management <br /> activities throughout the forest were monitored <br /> in to 1989.estab Streamishselines itored <br /> include Brush Creek and East Fork Brush Creek, <br /> proposed Adam's Rib ski area; <br /> data <br /> that may be used to evaluate effects of the prop <br /> Crystal River and Coal Creek, sampled to monitor the effects of the coal <br /> mine operation which was in the area of Coal Creek; Dutch Creek and Gypsum <br /> Creek, monitored to determine the effects of the Lincoln Creek, perueCreekn <br /> treatment and road building in the watershed; <br /> North Fork White River, and Snake River. <br /> 2 <br />