20080868 Ver 2_I-28 2014 DCUT11 Sweep Downstream Biotic Index Table_20150717

Table 1 -28. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the DCUT11 downstream station in May
of 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
65
1.0
30
30.0
Polychaeta
Amphicteis floridus
148
2.0
100
200.0
Arthropoda
I nsecta
Coleoptera
Berosus sp.
25
1.5
10
15.0
Peltodytes sp.
2
1.4
1
1.4
Diptera
Bezzia/Palpomyia complex
18
2.3
10
23.0
Chironomus decorus
7
1.0
3
3.0
Dicrotendipes nervosus
147
1.0
100
100.0
Goeldichironomus devineyae
138
2.0
100
200.0
Tabanus sp.
7
1.4
3
4.2
Tanytarsus sp.
268
2.3
100
230.0
Hemiptera
Abedus/Belostoma sp.
9
1.0
3
3.0
Corixidae sp.
31
1.3
30
39.0
Ranatra nigra
1
2.6
1
2.6
Odonata
Enallagma sp.
8
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium louisianum
9
2.2
3
6.6
Apocorophium sp.
114
2.2
100
220.0
Gammarus tigrinus
300
2.0
100
200.0
Decapoda
Palaemonetes pugio
9
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
12
2.0
10
20.0
Cyathura polita
1
2.0
1
2.0
Hargeria rapax
12
1.6
10
16.0
Mysida
Americamysis almyra
1
2.2
1
2.2
Mollusca
Bivalvia
Polymesoda caroliniana
1
1.0
1
1.0
Gastropoda
Littoridinops tenuipes
300
2.0
100
200.0
Total
823
1,531.0
Estuarine Biotic Index = 1.86
Total taxa = 28
Total taxa with sensitivity 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.
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