20080868 Ver 2_I-27 2015 DCUT11 Sweep Upstream Biotic Index Table_20160708

Table 1-27. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the DCUT11 upstream station in May
2015.
Species/taxon'
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Dero sp.
4
1.0
3
3.0
Tubificidae sp. w/ hair
4
1.0
3
3.0
Tubificidae sp. w/o hair
58
1.0
30
30.0
Polychaeta
Amphicteis floridus
134
2.0
100
200.0
Arthropoda
Insecta
Coleoptera
Berosus sp.
90
1.5
30
45.0
Diptera
Bezzia/Palmonyia complex
14
2.3
10
23.0
Chironomus decorus
3
1.0
3
3.0
Dicrotendipes nemosus
166
1.0
100
100.0
Glyptotendipes sp.
5
1.3
3
3.9
Larsia sp.
20
1.3
10
13.0
Parachironomus sp.
2
1.1
1
1.1
Tanypus neopunctipennis
21
1.0
10
10.0
Tanytarsus sp.
155
2.3
100
230.0
Ephemeroptera
Callibaetis sp.
2
1.1
1
1.1
Hemiptera
Abedus/Belostoma sp.
19
1.0
10
10.0
Corixidae sp.
15
1.3
10
13.0
Odonata
Enallagma sp.
13
1.5
10
15.0
Malacostraca
Amphipoda
Gammarus tigrinus
300
2.0
100
200.0
Isopoda
Cassidinidea lunifrons
65
2.0
30
60.0
Cyathrua polita
3
2.0
3
6.0
Mollusca
Bivalvia
Mytilopsis leucophaeata
3
1.5
3
4.5
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
670
1,174.6
Estuarine Biotic Index = 1.75
Total taxa = 29
Total taxa with sensitivitv values = 21
'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.
1-33