Group 3 - Transitional Prairie River Assemblage. This widespread community type occurred in the 

 Little Missouri River (4* -7* order medium to large warmwater rivers). The habitat quality of these 

 systems was rated medium to high with grazing and agriculture dominant land uses in these systems, so 

 sediment could be a problem. Genera associated with this group are moderately tolerant to sediment and 

 nutrients. Representative indicator taxa: Camelobatidius, Stemlmis, Leucotrichia pictipes, 

 Tricorythodes. 



Group 9 - Prairie Stream Assemblage. This ubiquitous prairie stream community type is found in all 

 basins and is associated with small to medium (2nd-5th order) prairie streams with the lowest elevation 

 and gradient. Although this group is found in small to large stream systems, it typically occurs in slow 

 current areas with silted, sand /gravel /cobble substrates, often with aquatic vegetation. The riffle areas of 

 these may have clean mixed cobble substrates similar to Group 3 habitats, but with less flow. Prairie 

 streams examples: S F Grand River, Jones Creek #2. Indicator taxa are typical of low-gradient streams 

 and are tolerant to disturbance: Caenis latipennis, Ceratopogon. Coenagrion. Enallagma civile, 

 Physella, Dubiraphia. 



Group 11 - Large Prairie River Assemblage. This group occurred in downstream confluence areas 

 and is associated with warm-water medium and large rivers (4*-7"' order) of lower elevation and 

 moderate gradient. Although this group is a large stream system community similar to Group 1 , it is found 

 in areas with more agricultural land use and sediment deposition than Group 1 . Indicator taxa are 

 relatively tolerant to disturbance and typical of low gradient streams with stable substrates and a slow- 

 moderate current velocity. Example rivers: Frenchman Creek, Missouri River, and Powder Rivers. 

 Indicator taxa consist of genera from many insect orders tolerant of sedimentation and moderate pollution: 

 Cheumatopsyche, Neochoroterpes Oklahoma. Choroterpes, Ambrysus mormom, Hemerodromia, 

 Microcylloepus, Hydropsyche morosa grp. 



Group 12 - Prairie Pool Assemblage. This group is associated with slow-moving small to medium 

 warm-water prairie streams (2"'' -5* order) of low-mid elevation, low gradient, typically with heavy 

 aquatic vegetation and low current or stagnant pool areas. Group 1 2 is a highly tolerant group of 

 invertebrates that can withstand low oxygen, high temperatures and siltation. Even though this group can 

 be found in large warmwater prairie systems, similar to Groups 9 and 1 1, it is found in areas with less 

 current and higher sediment influences. Stream examples: Hanging Woman, Sarpy, Coffee, O' Fallon 

 Creek, Thompson, Otter Creeks. Indicator taxa: Hyalella. Coenagrion/Enallagma, Gammarus sp., 

 Callibaetis, Glyptotendipes. Trichocorixa nais. Gyraulus, Erpobdella, Corisella. Stagnicola 



Group 37 - Filtering-Collector Assemblage. This moderately tolerant macroinvertebrate group is 

 associated with warm-water medium and large rivers (4*-6'*' order) of low elevation (2000-3500 ft), high 

 nutrient/turbidity and slow-moderate current velocity with stablea shifting substrates. This community 

 occurs in sand/gravel substrates of large rivers (A003, B005) or smaller (COOS) degraded streams with 

 sediment and nutrient problems. Two indicator taxa, Simulium and Hydropsyche confusa. can quickly 

 colonize newly exposed substrates, so shifting sediments will not disturb this community. Most indicator 

 taxa are filterer-col lectors or predators and can tolerate streams with higher sediment influences than 

 most other large stream/ river communities. Stream and river examples: Little Missouri River, SF Grand, 

 NF Moreau. Indicator taxa: Simulium, Isonychia, Stylurus, Eukiefferella claripennis grp., 

 Pseudocloeon, Hydropsyche confusa 



Appendix D - I 



