. A Cumulative biological assessment of macroinvertebrate sites in the Custer National Forest Ashland Ranger District [electronic resource] : a report to the Custer National Forest, Ashland Ranger District. Custer National Forest (Mont. and S. D. ); Research natural areas; Invertebrates. improving biointegrtiy to the low end of unimpaired (Figure 8, Table 6). Otter Creek reported 15 fewer taxa and declined in integrity with the MMI score (18 to 15) causing a shift to slightly-impaired (Figure 8). Figure 8. Site Revisits during the 2004-2008 study. MMI Score is the DEQ 1998 f / ./ * * *
. A Cumulative biological assessment of macroinvertebrate sites in the Custer National Forest Ashland Ranger District [electronic resource] : a report to the Custer National Forest, Ashland Ranger District. Custer National Forest (Mont. and S. D. ); Research natural areas; Invertebrates. improving biointegrtiy to the low end of unimpaired (Figure 8, Table 6). Otter Creek reported 15 fewer taxa and declined in integrity with the MMI score (18 to 15) causing a shift to slightly-impaired (Figure 8). Figure 8. Site Revisits during the 2004-2008 study. MMI Score is the DEQ 1998 f / ./ * * * P> <£ <£ 5^ *~ *~ *~ *~ vv° vv° o* O* o° o° o° o° ,/ ,/ These temporal community changes are found in examining only two years of data. The stream reaches considered for reference sites in a biomonitoring program should be sampled annually to encompass all possible within-site variability, as they are compared to newly sampled sites elsewhere in the watershed. A new site sampled in 2008, Parrish Spring compares very favorably to the other reference macroinvertebrate sites in the Ashland and will also be considered a high biointegrity S005 spring (Table 4, Figure 9). The DEQ 2006 Plains MMI seemed upresponsive to changes in the Cow Creek macroinvertebrate communities and ranks all sites as unimpaired (>37), upstream and downstream of the reservoir despite obvious silt and instream degradation downstream of the reservior and identified by the other metrics (Table 4, Figure 9). The DEQ LowVal MMI is designed to be used in the valleys of the Middle Rockies Ecoregion and therefore is inapplicable here, but I ran the samples to evaluate the response, and this Index seemed to track the community changes better than the Plains MMI (Table 4). We believe the 1998 DEQ MMI and S005 Spring O/E better reflect the "true conditions" on the ground and within the 15. Please note that these images are extracted from scanned page images that may have been digitally e
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