20080868 Ver 2_I-14 2015 Long Sweeps Downstream Biotic Index Table_20160708

Table 1-14. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Long Creek downstream station in
Mav 2015.
Species/taxon'
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Enchytraeidae sp.
5
1.0
3
3.0
Tubificidae sp. w/o hair
2
1.0
1
1.0
Tubificoides heterochaetus
1
1.1
1
1.1
Polychaeta
Amphicteis floridus
23
2.0
10
20.0
Eteone heteropoda
2
1.6
1
1.6
Laeonereis culveri
2
1.0
1
1.0
Polydora cornuta
10
1.2
10
12.0
Arthropoda
Insecta
Coleoptera
Tropisternus sp.
2
1.0
1
1.0
Diptera
Bezzia/Palpomyia complex
1
2.3
1
2.3
Chironomus decorus
87
1.0
30
30.0
Dicrotendipes nervosus
12
1.0
10
10.0
Goeldichironomus devineyae
37
2.0
30
60.0
Parachironomus sp.
8
1.1
3
3.3
Tanytarsus sp.
83
2.3
30
69.0
Ephemeroptera
Callibaetis sp.
1
1.1
1
1.1
Hemiptera
Corixidae sp.
8
1.3
3
3.9
Odonata
Enallagma sp.
27
1.5
10
15.0
Malacostraca
Amphipoda
Apocorophium lacustre
17
2.2
10
22.0
Apocorophium louisianum
64
2.2
30
66.0
Apocorophium sp.
209
2.2
100
220.0
Gammarus mucronatus
236
2.3
100
230.0
Gammarus tigrinus
172
2.0
100
200.0
Decapoda
Palaemonetes pugio
43
2.5
30
75.0
Rhithropanopeus harrisii
7
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
11
2.0
10
20.0
Cyathura polita
14
2.0
10
20.0
Edotia montosa
6
2.6
3
7.8
Mysida
Americamysis almyra
14
2.2
10
22.0
Tanaidacea
Hargeria rapax
110
1.6
100
160.0
Mollusca
Bivalvia
Mytilopsis leucophaeata
2
1.5
1
1.5
Gastropoda
Littoridinops sp.
148
2.0
100
200.0
Total
753
1,487.1
Estuarine Biotic Index = 1.97
Total We = 37
Total taxa with sensitivitv values = 29
aOnly those taxa for which a sensitivity value is available are displayed
bTotal number of individuals caught in all three sweep replicates.
'Sensitivity values provided by NCDWR.
1-20