20080868 Ver 2_I-13 2017 Long Sweeps Upstream Biotic Index Table_20180629

Table 1-13. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Long Creek upstream station in May
2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)'
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Naididae sp. w/o hair
8
1.0
3
3.0
Paranais sp.
2
1.1
1
1.1
Polychaeta
Amphicteis floridus
132
2.0
100
200.0
Eteone heteropoda
10
1.6
10
16.0
Laeonereis culveri
24
1.0
10
10.0
Polydora cornuta
2
1.2
1
1.2
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
12
2.3
10
23.0
Chironomus decorus
74
1.0
30
30.0
Cricotopus sp.
8
1.4
3
4.2
Dicrotendipes nervosus
36
1.0
30
30.0
Goeldichironomus devineyae
22
2.0
10
20.0
Parachironomus sp.
2
1.1
1
1.1
Polypedilum sp.
2
1.5
1
1.5
Tanytarsus sp.
52
2.3
30
69.0
Ephemeroptera
Callibaetis sp.
16
1.1
10
11.0
Hemiptera
Corixidae sp.
50
1.3
30
39.0
Trichocorixa sexcinta
4
1.0
3
3.0
Odonata
Enallagma sp.
26
1.5
10
15.0
Malacostraca
Amphipoda
Apocorophium lacustre
2
2.2
1
2.2
Apocorophium louisianum
24
2.2
10
22.0
Apocorophium sp.
202
2.2
100
220.0
Gammarus tigrinus
300
2.0
100
200.0
Decapoda
Palaemonetes pugio
25
2.5
10
25.0
Isopoda
Cassidinidea lunifrons
12
2.0
10
20.0
Edotia montosa
4
2.6
3
7.8
Mysida
Americamysis almyra
4
2.2
3
6.6
Mollusca
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
630
1,181.7
Estuarine Biotic Index = 1.88
Total taxa = 31
Total taxa with sensitivitv values = 24
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.
1-17