20080868 Ver 2_I-8 2014 PA2 Sweep Downstream Biotic Index Table_20150717

Table 1 -8. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the PA2 Creek downstream 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
32
1.0
30
30.0
Polychaeta
Amphicteis floridus
5
2.0
3
6.0
Eteone heteropoda
2
1.6
1
1.6
Laeonereis culveri
3
1.0
3
3.0
Polydora cornuta
12
1.2
10
12.0
Arthropoda
Insecta
Coleoptera
Berosus sp.
2
1.5
1
1.5
Peltodytes sp.
6
1.4
3
4.2
Diptera
Bezzia/Palpomyia complex
4
2.3
3
6.9
Chironomus decorus
119
1.0
100
100.0
Goeldichironomus devineyae
236
2.0
100
200.0
Parachironomus sp.
7
1.1
3
3.3
Odonata
Enallagma sp.
3
1.5
3
4.5
Ischnura sp.
6
1.0
3
3.0
Malacostraca
Amphipoda
Apocorophium louisianum
77
2.2
30
66.0
Apocorophium sp.
226
2.2
100
220.0
Gammarus mucronatus
12
2.3
10
23.0
Gammarus tigrinus
7
2.0
3
6.0
Decapoda
Palaemonetes pugio
4
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
11
2.0
10
20.0
Cyathura polita
1
2.0
1
2.0
Tanaidacea
Hargeria rapax
2
1.6
1
1.6
Mollusca
Gastropoda
Littoridinops tenuipes
300
2.0
100
200.0
Total
521
922.1
Estuarine Biotic Index = 1.77
Total taxa = 30
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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