20080868 Ver 2_I-54 2017 Long Ponar Downstream Biotic Index Table_20180629

Table 1-54. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Long Creek
downstream station in May 2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance Product of
value (n) (SV)(n)
Annelida
Polychaeta
Amphicteis floridus
1
2.0
1
2.0
Eteone heteropoda
6
1.6
3
4.8
Heteromastus filiformis
1
1.1
1
1.1
Marenzelleria viridis
101
2.6
100
260.0
Mediomastus ambiseta
3
2.0
3
6.0
Streblospio benedicti
7
1.1
3
3.3
Arthropoda
Insecta
Coleoptera
Berosus sp.
1
1.5
1
1.5
Diptera
Chironomus decorus
62
1.0
30
30.0
Tanypus neopunctipennis
9
1.0
3
3.0
Odonata
Enallagma sp.
1
1.5
1
1.5
Malacostraca
Amphipoda
Gammarus tigrinus
14
2.0
10
20.0
Isopoda
Cyathura polita
1
2.0
1
2.0
Mollusca
Bivalvia
Macoma balthica
14
1.5
10
15.0
Macoma tenta
25
2.0
10
20.0
Rangia cuneata
17
1.0
10
10.0
Gastropoda
Littoridinops sp.
32
2.0
30
60.0
Total
217
440.2
Estuarine Biotic Index = 2.03
Total taxa = 17
Total taxa with sensitivity values = 16
a Only those taxa for which a Sensitivity value is available are displayed
bTotal number of individuals caught in all five ponar replicates.
° Sensitivity values provided by NCDWR.