20080868 Ver 2_I-27 2014 DCUT11 Sweep Upstream Biotic Index Table_20150717

Table 1 -27. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the DCUT11 upstream station in May
2014.
1 -31
Number of
Sensitivity
Abundance
Product of
Species /taxona
individuals"
value (SV)°
value (n)
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
57
1.0
30
30.0
Polychaeta
Amphicteis floridus
135
2.0
100
200.0
Laeonereis culveri
4
1.0
3
3.0
Arthropoda
Insecta
Coleoptera
Berosus sp.
53
1.5
30
45.0
Hydaticus bimarginatus
1
1.1
1
1.1
Peltodytes sp.
28
1.4
10
14.0
Diptera
Bezzia/Palmonyia complex
7
2.3
3
6.9
Cricotopus sp.
3
1.4
3
4.2
Dicrotendipes nervosus
156
1.0
100
100.0
Goeldichironomus devineyae
26
2.0
10
20.0
Procladius sp.
1
1.2
1
1.2
Tanytarsus sp.
98
2.3
30
69.0
Hemiptera
Abedus/Belostoma sp.
27
1.0
10
10.0
Corixidae sp.
3
1.3
3
3.9
Odonata
Ischura sp.
2
1.0
1
1.0
Enallagma sp.
9
1.5
3
4.5
Libellula sp.
5
1.1
3
3.3
Malacostraca
Amphipoda
Apocorophium louisianum
17
2.2
10
22.0
Apocorophium sp.
149
2.2
100
220.0
Gammarus tigrinus
300
2.0
100
200.0
Orchestia uhleri
1
2.0
1
2.0
Isopoda
Cassidinidea lunifrons
63
2.0
30
60.0
Mollusca
Gastropoda
Littoridinops tenuipes
300
2.0
100
200.0
Total
682
1,221.1
Estuarine Biotic Index = 1.79
Total taxa = 28
Total taxa with sensitivity values = 23
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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