20080868 Ver 2_I-25 2014 DCUT19 Sweep Upstream Biotic Index Table_20150717

Table 1 -25. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the DCUT19 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
128
1.0
100
100.0
Polychaeta
Amphicteis floridus
187
2.0
100
200.0
Eteone heteropoda
1
1.6
1
1.6
Laeonereis culveri
2
1.0
1
1.0
Streblospio benedicti
3
1.1
3
3.3
Arthropoda
Insecta
Coleoptera
Berosus sp.
12
1.5
10
15.0
Diptera
Bezzia/Palpomyia complex
31
2.3
30
69.0
Chironomus decorus
149
1.0
100
100.0
Dicrotendipes nervosus
2
1.0
1
1.0
Goeldichironomus devineyae
172
2.0
100
200.0
Parachironomus sp.
10
1.1
10
11.0
Tanypus neopunctipennis
4
1.0
3
3.0
Tanytarsus sp.
148
2.3
100
230.0
Hemiptera
Abedus/Belostoma sp.
5
1.0
3
3.0
Corixidae sp.
3
1.3
3
3.9
Odonata
Enallagma sp.
2
1.5
1
1.5
Libellula sp.
2
1.1
1
1.1
Malacostraca
Amphipoda
Apocorophium louisianum
97
2.2
30
66.0
Apocorophium sp.
250
2.2
100
220.0
Gammarus mucronatus
10
2.3
10
23.0
Gammarus tigrinus
141
2.0
100
200.0
Decapoda
Palaemonetes pugio
33
2.5
30
75.0
Isopoda
Cassidinidea lunifrons
3
2.0
3
6.0
Tanaidacea
Hargeria rapax
13
1.6
10
16.0
Mollusca
Gastropoda
Littoridinops tenuipes
300
2.0
100
200.0
Total
950
1,750.4
Estuarine Biotic Index = 1.84
Total taxa = 27
Total taxa with sensitivity values = 25
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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