20080868 Ver 2_I-26 2015 DCUT19 Sweep Downstream Biotic Index Table_20160708

Table I-26. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the DCUT19 downstream station in
Mav of 2015.
Species/taxon'
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
66
1.0
30
30.0
Tubificoides heterochaetus
10
1.1
10
11.0
Polychaeta
Amphicteis floridus
158
2.0
100
200.0
Laeonereis culveri
6
1.0
3
3.0
Marenzellaria viridis
2
2.6
1
2.6
Polydora cornuta
6
1.2
3
3.6
Arthropoda
Insecta
Coleoptera
Peltodytes sp.
8
1.4
3
4.2
Diptera
Bezzia/Palpomyia complex
112
2.3
100
230.0
Chironomus decorus
162
1.0
100
100.0
Dicrotendipes nervosus
151
1.0
100
100.0
Goeldichironomus devineyae
10
2.0
10
20.0
Larsia sp.
8
1.3
3
3.9
Nanocladius sp.
3
2.0
3
6.0
Tanypus neopunctipennis
54
1.0
30
30.0
Tanytarsus sp.
300
2.3
100
230.0
Hemiptera
Abedus/Belostoma sp.
4
1.0
3
3.0
Corixidae sp.
10
1.3
10
13.0
Odonata
Enallagma sp.
4
1.5
3
4.5
Malacostraca
Amphipoda
Ameroculodes complex
2
2.6
1
2.6
Apocorophium lacustre
2
2.2
1
2.2
Apocorophium louisianum
38
2.2
30
66.0
Apocorophium sp.
75
2.2
30
66.0
Gammarus tigrinus
221
2.0
100
200.0
Decapoda
Palaemonetes pugio
14
2.5
10
25.0
Isopoda
Cassidinidea lunifrons
10
2.0
10
20.0
Cyathura polita
46
2.0
30
60.0
Edotia montosa
72
2.6
30
78.0
Mysida
Americamysis almyra
2
2.2
1
2.2
Tanaidacea
Hargeria rapax
86
1.6
30
48.0
Mollusca
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
985
1,764.8
Estuarine Biotic Index = 1.79
Total taxa = 34
Total taxa with sensitivitv values = 28
'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.
1-32