20080868 Ver 2_I-27 2017 DCUT11 Sweep Upstream Biotic Index Table_20180629

Table 1-27. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the DCUT11 upstrean
2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)c
Abundance
value (n)
Annelida
Oligochaeta
Enchytraeidae sp.
2
1.0
1
Naididae sp. w/o hair
10
1.0
10
Paranais sp.
5
1.1
3
Polychaeta
Amphicteis floridus
13
2.0
10
Laeonereis culveri
7
1.0
3
Arthropoda
Insecta
Coleoptera
Berosus sp.
10
1.5
10
Peltodytes sp.
1
1.4
1
Diptera
Bezzia/Palmonyia complex
6
2.3
3
Dicrotendipes nervosus
8
1.0
3
Tanytarsus sp.
29
2.3
10
Hemiptera
Abedus/Belostoma complex
16
1.0
10
Odonata
Enallagma sp.
7
1.5
3
Malacostraca
Amphipoda
Gammarus tigrinus
300
2.0
100
Isopoda
Cassidinidea lunifrons
82
2.0
30
Mollusca
Bivalvia
Mytilopsis leucophaeta
2
1.5
1
Gastropoda
Littoridinops sp.
300
2.0
100
Total
298
Estuarine Biotic Index = 1.89
Total taxa = 23
Total taxa with sensitivity values = 15
aOnly 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

i station in May
Product of
(SV)(n)
1.0
10.0
3.3
20.0
3.0
15.0
1.4
6.9
3.0
23.0
10.0
4.5
200.0
60.0
1.5
200.0
562.6
1-31