20080868 Ver 2_I-3 2017 Jacks Sweep Upstream Biotic Index Table_20180629

Table 1-3. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Jacks Creek upstream station in May
2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)'
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Enchytraeidae sp.
6
1.0
3
3.0
Naididae sp. w/o hair
3
1.0
3
3.0
Polychaeta
Amphicteis floridus
49
2.0
30
60.0
Polydora cornuta
2
1.2
1
1.2
Arthropoda
Insecta
Coleoptera
Berosus sp.
1
1.5
1
1.5
Peltodytes sp.
2
1.4
1
1.4
Diptera
Bezzia/Palmonyia complex
28
2.3
10
23.0
Chironomus decorus
56
1.0
30
30.0
Dicrotendipes nervosus
64
1.0
30
30.0
Goeldichironomus devineyae
4
2.0
3
6.0
Parachironomus sp.
3
1.1
3
3.3
Tanypus neopunctipennis
2
1.0
1
1.0
Tanytarsus sp.
75
2.3
30
69.0
Ephemeroptera
Callibaetis sp.
4
1.1
3
3.3
Hemiptera
Corixidae sp.
188
1.3
100
130.0
Trichocorixa sexcintca
86
1.0
30
30.0
Odonata
Enallagma sp.
4
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium lacustre
8
2.2
3
6.6
Apocorophium louisianum
26
2.2
10
22.0
Apocorophium sp.
149
2.2
100
220.0
Gammarus tigrinus
185
2.0
100
200.0
Uhlorchestia uhleri
5
2.0
3
6.0
Decapoda
Palaemonetes pugio
3
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
24
2.0
10
20.0
Mollusca
Bivalvia
Mytilopsis leucophaeata
2
1.5
1
1.5
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
612
1,083.8
Estuarine Biotic Index = 1.77
Total taxa = 33
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.
1-31