20080868 Ver 2_I-26 2017 DCUT19 Sweep Downstream Biotic Index Table_20180629

Table 1-26. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the DCUT19 downstream station in May of
2017.
Species/taxono
Number of Sensitivity
individualsb value (SV)`
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Enchytraeidae sp.
4
1.0
3
3.0
Limnodrilus hoffineisteri
14
1.0
10
10.0
Naididae sp. w/o hair
53
1.0
30
30.0
Tubificoides heterochaetus
3
1.1
3
3.3
Polychaeta
Amphicteis floridus
179
2.0
100
200.0
Marenzelleria virdis
1
2.6
1
2.6
Polydora cornuta
1
1.2
1
1.2
Arthropoda
Insecta
Coleoptera
Berosus sp.
7
1.5
3
4.5
Peltodytes sp.
2
1.4
1
1.4
Diptera
Apedilum sp.
2
4.0
1
4.0
Bezzia/Palpomyia complex
13
2.3
10
23.0
Chironomus decorus
4
1.0
3
3.0
Dicrotendipes nervosus
140
1.0
100
100.0
Polypedilum sp.
2
1.5
1
1.5
Tanytarsus sp.
205
2.3
100
230.0
Odonata
Enallagma sp.
3
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium lacustre
49
2.2
30
66.0
Apocorophium louisianum
6
2.2
3
6.6
Apocorophium sp.
104
2.2
100
220.0
Gammarus tigrinus
300
2.0
100
200.0
Decapoda
Palaemonetes pugio
1
2.5
1
2.5
Hemiptera sp.
Corixidae sp.
3
1.3
3
3.9
Isopoda
Cassidinidea lunifrons
25
2.0
10
20.0
Cyathura polita
8
2.0
3
6.0
Edotia montosa
3
2.6
3
7.8
Mollusca
Bivalvia
Mytilopsis leucophaeata
1
1.5
1
1.5
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
1
724
1,356.3
Estuarine Biotic Index = 1.87
Total taxa = 29
Total taxa with sensitivity values = 25
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.
1-30