20080868 Ver 2_I-5 2017 Jacobs Sweep Upstream Biotic Index Table_20180629

Table 1-5. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Jacobs Creek upstream station in
May 2017.
Species/taxon a
Number of
individuals"
Sensitivity
value (SV)'
Abundance
value n
Product of
(SV)(n)
Annelida
Oligohaeta
Enchytraeidae sp.
8
1.0
3
3.0
Naididae sp. w/o hair
54
1.0
30
30.0
Polychaeta
Amphicteis floridus
70
2.0
30
60.0
Laeoenreis culveri
70
1.0
30
30.0
Polydora cornuta
2
1.2
1
1.2
Arthropoda
Insecta
Coleoptera
Berosus sp.
26
1.5
10
15.0
Peltodytes sp.
12
1.4
10
14.0
Diptera
Apedilum sp.
4
4.0
3
12.0
Bezzia/Palmonyia complex
8
2.3
3
6.9
Dicrotendipes nervosus
22
1.0
10
10.0
Goeldichironomus devineyae
6
2.0
3
6.0
Tanytarsus sp.
2
2.3
1
2.3
Ephemeroptera
Callibaetis sp.
2
1.1
1
1.1
Hemiptera
Abedus/Belostoma complex
6
1.0
3
3.0
Corixidae sp.
252
1.3
100
130.0
Trichocorixa sexcinta
136
1.0
100
100.0
Odonata
Enallagma sp.
4
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium lacustre
2
2.2
1
2.2
Apocorophium louisianum
50
2.2
30
66.0
Apocorophium sp.
256
2.2
100
220.0
Gammarus tigrinus
56
2.0
30
60.0
Decapoda
Palaemonetes pugio
6
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
16
2.0
10
20.0
Mollusca
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
615
1,004.7
Estuarine Biotic Index = 1.63
Total taxa = 25
Total taxa with sensitivitv values = 22
'Only 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.
1-9