20080868 Ver 2_I-78 2017 DCUT19 Ponar Downstream Biotic Index Table_20180629

Table 1-78. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the DCUT19
downstream station in May 2017.
Species/taxona
Number of Sensitivity
individualsb value (SV)`
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Naididae sp. w/o hair
28
1.0
10
10.0
Tubificoides heterochaetus
43
1.1
30
33.0
Polychaeta
Amphicteis floridus
500
2.0
100
200.0
Eteone heteropoda
4
1.6
3
4.8
Laeonereis culveri
76
1.0
30
30.0
Marenzellaria viridis
47
2.6
30
78.0
Polydora cornuta
4
1.2
3
3.6
Arthropoda
Insecta
Coleoptera sp.
Berosus sp.
4
1.5
3
4.5
Diptera
Beezia/Palpomyia complex
80
2.3
30
69.0
Chironomus decorus
208
1.0
100
100.0
Dicrotendipes nervosus
109
1.0
100
100.0
Goeldichironomus devineyae
4
2.0
3
6.0
Tanytarsus sp.
72
2.3
30
69.0
Malacostraca
Amphipoda
Apocorophium lacustre
72
2.2
30
66.0
Apocorophium sp.
48
2.2
30
66.0
Gammarus tigrinus
500
2.0
100
200.0
Isopoda
Cyathura polity
49
2.0
30
60.0
Edotia montosa
4
2.6
3
7.8
Mollusca
Bivalvia
Mytilopsis leucophaeta
3
1.5
3
4.5
Rangia cuneata
8
1.0
3
3.0
Gastropoda
Littoridinops sp.
282
2.0
100
200.0
Total
771
1315.2
Estuarine Biotic Index = 1.71
Total taxa = 24
Total taxa with sensitivity values = 19
a Only those taxa for which a sensitivity value is available are displayed
b Total number of individuals caught in all five ponar replicates.
° Sensitivity values provided by NCDWR.