. Aquatic surveys and re-assessment of sites within the Middle Powder River Watershed. Aquatic ecology; Aquatic biology; Invertebrates; Mayflies; Coalbed methane. â 2005 â 2011 POW#l POW#2 POW#12 POW#3 POW#6 POW#5 MOOR S ISl Powder River Fish O/E. -2005 -2011 POW#l POW#2 POW#12 POW#3 POW #6 POW #5 MOOR Figure 5. Powder River study reach fish community IBI (top) and Observed/ Expected (O/E) (bottom) Scores for 2005 and 2011. Flathead chubs dominated the community composition across all sites in 2011 (avg. 66% of individuals), representing a complete shift from the sand s
. Aquatic surveys and re-assessment of sites within the Middle Powder River Watershed. Aquatic ecology; Aquatic biology; Invertebrates; Mayflies; Coalbed methane. â 2005 â 2011 POW#l POW#2 POW#12 POW#3 POW#6 POW#5 MOOR S ISl Powder River Fish O/E. -2005 -2011 POW#l POW#2 POW#12 POW#3 POW #6 POW #5 MOOR Figure 5. Powder River study reach fish community IBI (top) and Observed/ Expected (O/E) (bottom) Scores for 2005 and 2011. Flathead chubs dominated the community composition across all sites in 2011 (avg. 66% of individuals), representing a complete shift from the sand shiner dominated assemblages of 2005 and 2008 (Stagliano 2006, Peterson et al. 2009) (Figure 6). These data do not support the recent hypthesis that the switch in dominance to the sand shiner community was linked to a decrease in water quality More likely, this shift was caused by spatial or temporal variability in fish communities per reach. In addition, overall decreases in the abundance of longnose dace in 2011, which are intolerant of poor water quality, lends some support to this conclusion. In contrast, an increase in the percent of western and silvery plains minnows in the catch in 2011 is a positive indicator of water quality because these species are also considered less tolerant to water quality changes, but the low numbers of total fish per site that we derived these percentages from is still troubling. 10. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stagliano, David M. ,author; Montana Natural Heritage Program; United States. Bureau of Land Management. Miles City District; Interagency BLM Aquatic Task Group. Helena, Montana : Montana Natural heritage Program
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