20080868 Ver 2_I-14 2017 Long Sweeps Downstream Biotic Index Table_20180629

Table 1-14. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Long Creek downstream station in
May 2017.
Species/taxona
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
Polychaeta
Amphicteis floridus
1
2.0
1
2.0
Marenzelleria viridis
4
2.6
3
7.8
Streblospio benedicti
1
1.2
1
1.2
Arthropoda
Insecta
Coleoptera
Peltodytes sp.
1
1.4
1
1.4
Diptera
Apedilum sp.
2
4.0
1
4.0
Bezzia/Palpomyia complex
4
2.3
3
6.9
Chironomus decorus
3
1.0
3
3.0
Dicrotendipes nervosus
44
1.0
30
30.0
Parachironomus sp.
52
1.1
30
33.0
Tanytarsus sp.
6
2.3
3
6.9
Ephemeroptera
Callibaetis sp.
14
1.1
10
11.0
Hemiptera
Corixidae sp.
9
1.3
3
3.9
Trichocorixa sexcinta
2
1.0
1
1.0
Odonata
Enallagma sp.
26
1.5
10
15.0
Malacostraca
Amphipoda
Apocorophium lacustre
106
2.2
100
220.0
Apocorophium louisianum
49
2.2
30
66.0
Apocorophium sp.
300
2.2
100
220.0
Gammarus mucronatus
276
2.3
100
230.0
Gammarus tigrinus
300
2.0
100
200.0
Decapoda
Palaemonetes pugio
2
2.5
1
2.5
Isopoda
Cassidinidea lunifrons
3
2.0
3
6.0
Cyathura polita
2
2.0
1
2.0
Tanaidacea
Hargeria rapax
30
1.6
30
48.0
Maxillopoda
Sessilia
Balanus improvisus
20
2.0
10
20.0
Mollusca
Bivalvia
Geukensia demissa
1
3.4
1
3.4
Mytilopsis leucophaeata
4
1.5
3
4.5
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
680
1,350.5
Estuarine Biotic Index = 1.99
Total taxa = 28
Total taxa with sensitivity values = 26
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.
M