20080868 Ver 2_I-25 2017 DCUT19 Sweep Upstream Biotic Index Table_20180629

Table 1-25. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the DCUT19 upstream station in May
2017.
Species/taxon a
Number of
individualsb
Sensitivity
value SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Naididae sp. w/ hair
2
1.0
1
1.0
Naididae sp. w/o hair
90
1.0
30
30.0
Polychaeta
Amphicteis floridus
122
2.0
100
200.0
Laeonereis culveri
22
1.0
10
10.0
Arthropoda
Insecta
Coleoptera
Berosus sp.
116
1.5
100
150.0
Peltodytes sp.
2
1.4
1
1.4
Diptera
Bezzia/Palpomyia complex
16
2.3
10
23.0
Chironomus decorus
10
1.0
10
10.0
Dicrotendipes nervosus
96
1.0
30
30.0
Goeldichironomus devineyae
6
2.0
3
6.0
Tabanus sp.
2
1.4
1
1.4
Tanytarsus sp.
118
2.3
100
230.0
Hemiptera
Abedus/Belostoma complex
10
1.0
10
10.0
Pelocoris femoratus
2
2.3
1
2.3
Odonata
Libellula sp.
2
1.1
1
1.1
Malacostraca
Amphipoda
Apocorophium sp.
16
2.2
10
22.0
Gammarus tigrinus
250
2.0
100
200.0
Uhlorchestia uhleri
4
2.0
3
6.0
Isopoda
Cassidinidea lunifrons
40
2.0
30
60.0
Mollusca
Bivalvia
Mytilopsis leucopaeata
2
1.5
1
1.5
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
652
1,195.7
Estuarine Biotic Index = 1.83
Total taxa = 30
Total taxa with sensitivitv values = 21
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.
1-29