. 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. (Amphinemura cf. banksi) reported in the Ashland District was found at the three reference condition spring systems. Amphinemura can persist in springs and intermittent streams through a long egg-diapause period during the summer months, and perform much of their growth in the fall and winter months emerging i
. 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. (Amphinemura cf. banksi) reported in the Ashland District was found at the three reference condition spring systems. Amphinemura can persist in springs and intermittent streams through a long egg-diapause period during the summer months, and perform much of their growth in the fall and winter months emerging in May (Stewart and Stark 1993). The S005 reference condition indicator mayfly, Baetis tricaudatus was found at seven of the higher integrity spring sites, and in Otter Creek 2004, but not in 2005. Three mayflies, Callibaetis ferrugineus, C. fluctuans and Caenis latipennis were the most ubiquitously distributed of EPT taxa across the Ashland District, occurring at nine, eleven and 12 sites respectively; these species occupied stock pond habitats and pool areas of Figure 7. Sites with NWGP Spring S005 Indicator Taxa. Excellent = >11 species, Good 9-11, Fair 5-8, Degraded =< 5. streams with aquatic vegetation. The caddisfly, Hesperophylax cf. designatus (Figure 6), a Reference Spring Indicator Taxon (Table 4) was found at eleven springs and streams with at least some clean gravel substrate and large cobbles or woody debris present (Figure 7). Sites containing the most high-integrity spring indicator taxa were predominately in the southwestern part of the Ashland District where shale and sandstone is more prevalent (Figure 7). The maximum number of EPT taxa present in excellent condition springs was four: the stonefly {Amphinemura banksi), mayfly {Baetis tricaudatus) and two caddisflies. An interesting taxon reported from the 2005 Charcoal Creek site, was the Dryopid riffle beetle, Helichus cf. lithophilus, which has not been collected at any other spring site, while two othe
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