20080868 Ver 2_I-6 2014 Jacobs Sweep Downstream Biotic Index Table_20150717

Table 1 -6. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Jacobs Creek downstream station in
May 2014.
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Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)`
value (n)
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
4
1.0
3
3.0
Polychaeta
Amphicteis floridus
68
2.0
30
60.0
Eteone heteropoda
42
1.6
30
48.0
Laeonereis culveri
3
1.0
3
3.0
Polydora cornuta
15
1.2
10
12.0
Arthropoda
Insecta
Coleoptera
Peltodytes sp.
3
1.4
3
4.2
Tropisternus sp.
15
1.0
10
10.0
Diptera
Bezzia/Palmonyia complex
10
2.3
10
23.0
Chironomus decorus
272
1.0
100
100.0
Cricotopus sp.
13
1.4
10
14.0
Dicrotendipes nervosus
12
1.0
10
10.0
Goeldichironomus devineyae
72
2.0
30
60.0
Parachironomus sp.
94
1.1
30
33.0
Polypedilum sp.
3
1.5
3
4.5
Procladius sp.
3
1.2
3
3.6
Tanytarsus sp.
3
2.3
3
6.9
Odonata
Enallagma sp.
12
1.5
10
15.0
Oecetis inconspicua
3
4.6
3
13.8
Malacostraca
Amphipoda
Apocorophium lacustre
8
2.2
3
6.6
Apocorophium louisianum
52
2.2
30
66.0
Apocorophium sp.
274
2.2
100
220.0
Gammarus mucronatus
212
2.3
100
230.0
Gammarus tigrinus
163
2.0
100
200.0
Decapoda
Rhithropanopeus harrisii
97
2.5
30
75.0
Isopoda
Cassidinidea lunifrons
31
2.0
30
60.0
Cyathura polita
19
2.0
10
20.0
Edotia montosa
19
2.6
10
26.0
Mysida
Americamysis almyra
78
2.2
30
66.0
Tanaidacea
Hargeria rapax
224
1.6
100
160.0
Maxillopoda
Sessilia
Balanus improvisus
3
2.0
3
6.0
Mollusca
Gastropoda
Littoridinops tenuipes
232
2.0
100
200.0
Total
947
1,759.6
Estuarine Biotic Index = 1.86
Total taxa = 35
Total taxa with sensitivity values = 31
'Only 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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