20080868 Ver 2_I-25 2015 DCUT19 Sweep Upstream Biotic Index Table_20160708

Table 1-25. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the DCUT19 upstream station in May
2015.
Species/taxon'
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Enchytraeidae sp.
9
1.0
3
3.0
Paranais litoralis
14
1.1
10
11.0
Polychaeta
Amphicteis floridus
28
2.0
10
20.0
Arthropoda
Insecta
Coleoptera
Berosus sp.
3
1.5
3
4.5
Diptera
Atrichopogon sp.
1
2.3
1
2.3
Bezzia/Palpomyia complex
35
2.3
30
69.0
Chironomus decorus
55
1.0
30
30.0
Dicrotendipes nervosus
21
1.0
10
10.0
Goeldichironomus devineyae
2
2.0
1
2.0
Larsia sp.
46
1.3
30
39.0
Tanypus neopunctipennis
10
1.0
10
10.0
Tanytarsus sp.
107
2.3
100
230.0
Hemiptera
Abedus/Belostoma sp.
2
1.0
1
1.0
Odonata
Enallagma sp.
1
1.5
1
1.5
Pachydiplax longipennis
1
1.1
1
1.1
Malacostraca
Amphipoda
Apocorophium sp.
1
2.2
1
2.2
Gammarus tigrinus
92
2.0
30
60.0
Isopoda
Cassidinidea lunifrons
3
2.0
3
6.0
Cyathura polita
1
2.0
1
2.0
Tanaidacea
Hargeria rapax
1
1.6
1
1.6
Mollusca
Bivalvia
Rangia cuneata
1
1.0
1
1.0
Gastropoda
Littoridinops sp.
266
2.0
100
200.0
Total
378
707.2
Estuarine Biotic Index = 1.87
Total taxa = 30
Total taxa with sensitivitv values = 22
'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.
1-31