20080868 Ver 2_I-28 2017 DCUT11 Sweep Downstream Biotic Index Table_20180629

Table 1-28. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the DCUT11 downstream station in
May of 2017.
Species/taxon a
Number of
individualsb
Sensitivity
value SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Naididae sp. w/o hair
1
1.0
1
1.0
Paranais sp.
1
1.1
1
1.1
Polychaeta
Amphicteis floridus
78
2.0
30
60.0
Laeonereis culveri
4
1.0
3
3.0
Arthropoda
Insecta
Coleoptera
Berosus sp.
33
1.5
30
45.0
Pelodytes sp.
1
1.4
1
1.4
Diptera
Bezzia/Palpomyia complex
3
2.3
3
6.9
Dicrotendipes nervosus
21
1.0
10
10.0
Tanytarsus sp.
106
2.3
100
230.0
Hemiptera
Abedus/Belostoma complex
16
1.0
10
10.0
Corixidae sp.
4
1.3
3
3.9
Ranatra nigra
7
2.6
3
7.8
Odonata
Enallagma sp.
1
1.5
1
1.5
Malacostraca
Amphipoda
Apocorophium lacustre
3
2.2
3
6.6
Apocorophium sp.
5
2.2
3
6.6
Gammarus tigrinus
278
2.0
100
200.0
Isopoda
Cassidinidea lunifrons
60
2.0
30
60.0
Mollusca
Bivalvia
Mytilopsis leucophaeta
2
1.5
1
1.5
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
433
856.3
Estuarine Biotic Index = 1.98
Total taxa = 24
Total taxa with sensitivity values = 17
'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