20080868 Ver 2_I-3 2014 Jacks Sweep Upstream Biotic Index Table_20150717

Table 1 -3. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Jacks Creek upstream station in May
2014.
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Number of
Sensitivity
Abundance
Product of
Species /taxona
individuals"
value (SV)°
value (n)
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
20
1.0
10
10.0
Polychaeta
Amphicteis floridus
52
2.0
30
60.0
Polydora cornuta
1
1.2
1
1.2
Streblospio benedicti
2
1.1
1
1.1
Arthropoda
Insecta
Coleoptera
Berosus sp.
2
1.5
1
1.5
Peltodytes sp.
10
1.4
10
14.0
Diptera
Bezzia/Palmonyia complex
9
2.3
3
6.9
Chironomus decorus
141
1.0
100
100.0
Dicrotendipes nervosus
1
1.0
1
1.0
Goeldichironomus devineyae
66
2.0
30
60.0
Parachironomus sp.
5
1.1
3
3.3
Procladius sp.
39
1.2
30
36.0
Tanypus neopunctipennis
9
1.0
3
3.0
Tanytarsus sp.
17
2.3
10
23.0
Hemiptera
Abedus/Belostoma sp.
2
1.0
1
1.0
Corixidae sp.
131
1.3
100
130.0
Trichocorixa sexcinta
15
1.0
10
10.0
Odonata
Enallagma sp.
27
1.5
10
15.0
Libellula sp.
2
1.1
1
1.1
Malacostraca
Amphipoda
Apocorophium louisianum
12
2.2
10
22.0
Apocorophium sp.
59
2.2
30
66.0
Gammarus tigrinus
96
2.0
30
60.0
Isopoda
Cassidinidea lunifrons
12
2.0
10
20.0
Cyathura polita
2
2.0
1
2.0
Mollusca
Bivalvia
Mytilopsis leucophaeta
3
1.5
3
4.5
Gastropoda
Littoridinops tenuipes
300
2.0
100
200.0
Total
539
852.6
Estuarine Biotic Index = 1.58
Total taxa = 33
Total taxa with sensitivity values = 26
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.
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