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- r <br /> COAL CREEK <br /> Pour stations were sampled in September 1989 and in June 1990. In June, the aquatic <br /> /inacroinvertebrate community at Station 1 had JDv diversity. There were indications of omit <br /> enrichment. The simuliids were the most numerous taxa in the community, with over 250/m2. There <br /> were cleanwater spec�rreesent, which indicated at least fairly good conditions in this ecosystem and <br /> included mayflies Epeorus and Rhithrogena and di teran Agathon and Bibiocephala. <br /> �It/""` ;�= ti <br /> At Station 2, the community had better diversity, but there were indications of sediment and some <br /> organic nutrients. eanwater species present in irly good conditi <br /> icated at least faons and included <br /> mayflies Epeorus and Rhith or gena, stoneflies Podmosta,Zapada cinctipes,Amphinerrrura, and Perlomyia <br /> / utahensis, and dipterans Agathon and Bibiocephala. <br /> M�S '-r <br /> At Station 3, there was fairly good diversity, as found at Station 2. There were more indications <br /> of sediment and organic nutrients at drys s a r i —C'feanwater species had less diversity, which indicated <br /> more impacts at this station but included low numbers of mayflies Epeorus and Mtithrogena, stonefly <br /> Podmosta, and dipteran Agathon. <br /> At Station 4, there w��wersity iust nine taxa, compared to twenty taxa at Stations 2 and <br /> 3. None of the species in the community had resident population numbers, which indicated they were <br /> not living rng successfully under existing cnnclitinnc_ ®haw w�� <br /> Van <br /> v When compared with data from June 1989, the analysis elements in June 1990 indicated that the eJ``ll <br /> were even more stress conditions present than were observed in June of the prior year, particularly at the O� ? <br />;o lower station. The BCI values and other data appeared similar at Station 1. At the other stations, the <br />' h�,g�1 DAT diversity index value, the standing crop, and the BCI values were all lower in 1990, particularly �O <br /> —it—thelower two stations. <br /> In September, there was fairly good diversity at the upper Station (1), which had twenty taxa. <br /> Cleanwater species indicated that there was good water quality and some good instream substrate and <br /> included mayfly Mithrogena and stoneflies Podmosta and Zapada cinctipes. There were some indications <br /> of sediment and organic nutrients, and most of the taxa did not have resident population numbers, which <br /> often indicates instability. <br /> At Stations 2 and 3, there was low diversity and extremely low numbers of individuals for taxa <br /> in the communities. None had resident population numbers. There was just one cleanwater species <br /> present at these stations, a mayfly, Rhithrogena, which had less than resident population numbers. 'There <br /> were just eight taxa at Station 2 and six at Station 3. <br /> 13 t� <br /> � to� <br />