20080868 Ver 2_I-28 2015 DCUT11 Sweep Downstream Biotic Index Table_20160708

Table 1-28. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the DCUT11 downstream station in
Mav of 2015.
Species/taxon a
Number of
individualsb
Sensitivity
value (SV)'
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Dero sp.
8
1.0
3
3.0
Limnodrilus hoffineisteri
4
1.0
3
3.0
Tubificidae sp. w/ hair
10
1.0
10
10.0
Tubificidae sp. w/o hair
53
1.0
30
30.0
Polychaeta
Amphicteis floridus
201
2.0
100
200.0
Arthropoda
Insecta
Coleoptera
Berosus sp.
25
1.5
10
15.0
Diptera
Bezzia/Palpomyia complex
58
2.3
30
69.0
Chironomus decorus
2
1.0
1
1.0
Corynoneura sp.
3
2.5
3
7.5
Dicrotendipes nervosus
300
1.0
100
100.0
Larsia sp.
3
1.3
3
3.9
Tanypus neopunctipennis
68
1.0
30
30.0
Tanytarsus sp.
300
2.3
100
230.0
Hemiptera
Abedus/Belostoma sp.
30
1.0
30
30.0
Corixidae sp.
5
1.3
3
3.9
Ranatra nigra
8
2.6
3
7.8
Ranatra sp.
7
2.6
3
7.8
Odonata
Enallagma sp.
3
1.5
3
4.5
Libellula sp.
8
1.1
3
3.3
Pachydiplax longipennis
2
1.0
1
1.0
Trichoptera
Oecetis inconspicua
7
4.6
3
13.8
Malacostraca
Amphipoda
Apocorophium lacustre
12
2.2
10
22.0
Apocorophium sp.
4
2.2
3
6.6
Gammarus tigrinus
300
2.0
100
200.0
Decapoda
Rhithropanopeus harrisii
3
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
104
2.0
100
200.0
Cyathura polita
38
2.0
30
60.0
Mollusca
Bivalvia
Mytilopsis leucophaeata
3
1.5
3
4.5
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
821
1,475.1
Estuarine Biotic Index = 1.80
Total taxa = 31
Total taxa with sensitivitv values = 26
80nly 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.
1-34