. Aquatic surveys and re-assessment of sites within the Middle Powder River Watershed. Aquatic ecology; Aquatic biology; Invertebrates; Mayflies; Coalbed methane. I Sand Shiner l Flathead Chub I Longnose Dace I Plains Minnow l Channel Catfish I Western Silvery Minnow Goldeye River Carpsucker 2011. I Flathead Chub I Sand Shiner f Western Silvery Minnow I Plains Minnow i Channel Catfish Goldeye Longnose Dace Stonecat Figure 6. Powder River study reach fish community proportion for the dominant 8 species by total individuals in 2005 (top) and 20011 (bottom). Relative utility of Fish IBI vs. O/E A
. Aquatic surveys and re-assessment of sites within the Middle Powder River Watershed. Aquatic ecology; Aquatic biology; Invertebrates; Mayflies; Coalbed methane. I Sand Shiner l Flathead Chub I Longnose Dace I Plains Minnow l Channel Catfish I Western Silvery Minnow Goldeye River Carpsucker 2011. I Flathead Chub I Sand Shiner f Western Silvery Minnow I Plains Minnow i Channel Catfish Goldeye Longnose Dace Stonecat Figure 6. Powder River study reach fish community proportion for the dominant 8 species by total individuals in 2005 (top) and 20011 (bottom). Relative utility of Fish IBI vs. O/E Although the fish IBI is inadequate to determine the fish community integrity, it is a useful tool for monitoring sites between years, and it correlated strongly with the habitat quality index (r=, p25 and <75). Even when Powder River sites had their full fish community present (POW5 in 2005), they still ranked only "fair" in biointegrity with the IBI (Figure 5). This can be explained in part because the lowest-scoring metrics were those with adjustments for catchment area, such as number of native species and number of native families. The Powder River is a diverse aquatic system, but one cannot expect a linear increase in fish species with increasing watershed area. For example, to bring the IBI to over 70, a sample of all 20 native species in the Powder River with no tolerant individuals would be required. This situation brings into question the suitabilty of the IBI to a watershed of this size. The largest catchment area of sites used by Bramblett et al. (2005) in developing the fish IBI was about 14,000 km2 while catchment areas for our sites on the Powder River ranged from about 20,000km2 to well over 23,000 km2. By extrapolating beyond the range of the calibration data, we risk serious prediction errors. By using the O/E model as a direct measure of community completeness, the highest expected score in the 11. Please note that these images are extracted
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Keywords: ., bhlcoll, bookleafnumber20, booksubjectinvertebrates, bookyear2012
