TABLE 6. Macroinvertebrate Bioassessment Data for Blue River 2001. Reference: Mitchell River, North Carolina
|
Site No. |
3 |
Score |
6 |
Score |
7 |
Score |
Reference |
|
Site Location |
White Cloud |
|
Rothrock’s Dam |
|
Milltown |
|
Mitchell River |
|
Taxa Richness, Families |
26
|
100%=6
|
19
|
6
|
17
|
4
|
21 Families |
|
FBI |
3.96 |
100%=6 |
3.99 |
6 |
3.5 |
6 |
4.59 |
|
EPT/Chironomidae |
49.9% |
2 |
36.1 |
6 |
5.8 |
4 |
9.286 |
|
CPOM Community Shredders/ Total |
0.01
|
0
|
.01
|
0
|
.02
|
0
|
6
|
|
EPT index |
9 |
6 |
8 |
6 |
6 |
2 |
8 |
|
% Contribution Dom. Family |
23% |
6 |
47.6% Elmidae |
4
|
18%
|
6
|
34%=3
|
|
Community Loss |
Used as Reference |
6 |
79% |
4 |
23% |
6 |
6 |
|
Ratio of Scrapers to Filterers |
>50% |
1.50=6 |
300% |
6 |
60% |
6 |
1.50 |
|
Total Score |
|
38 |
|
38 |
|
36 |
45 |
Analysis: Site 3--38/45=84.4% Non-impaired. Best situation to be expected
within an ecoregion. Balanced trophic structure. Optimum community structure for
stream size and habitat quality. Analysis: Site 6 --38/45=84.4% Non-impaired.
Best situation to be expected within an ecoregion. Balanced trophic structure.
Optimum community structure for stream size and habitat quality. Analysis: Site
7--36/45=80.0% Non-impaired. Best situation to be expected within an ecoregion.
Balanced trophic structure. Optimum community structure for stream size and
habitat quality. Taxa Richness=Site TR/RefTR x 100 >80%=6; 60-80=4; 40-60=2;
<40=0
FBI=Site FBI/Ref FBI x 100 >85%=6; 70-85=4; 50-70=2; <50%=0
EPT/Chironomidae=Site Ratio/Ref Ratio x 100 >75%=6; 50-75=4; 50-70=2; <50=0
Shredder Community/Total=>50%=6; 35-50%=4; 20-35%=2; <20%=0.
EPT Index=Site/8 x 100 >90%=6; 80-90%=4; 70-80=2; <70=0
% Contribution of Dominant Family 0-35%=6; 35-50%=4; 50-75%=2; >75%=0
Scrapers/Filterers=Ratio of Site/ Ref Ratio x 100 >50%=6; 35-50=4; 20-35=2;
<20%=0
Community Loss (Comparing Site 3 to other sites=<0.5=6; 0.5-1.5=4; 1.5-4=2; >4=0