20080868 Ver 2_I-18 2017 Muddy Sweep Downstream Biotic Index Table_20180629

Table I-18. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Muddy 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. Wo hair
26
1.0
10
10.0
Polychaeta
Amphicteis floridus
42
2.0
30
60.0
Eteone heteropoda
4
1.6
3
4.8
Polydora cornuta
26
1.2
10
12.0
Arthropoda
Insecta
Coleoptera
Peltodytes sp.
8
1.4
3
4.2
Diptera
Apedilum sp.
30
4.0
30
120.0
Bezzia/Palpomyia complex
8
2.3
3
6.9
Chironomus decorus
114
1.0
100
100.0
Cricotopus sp.
50
1.4
30
42.0
Dicrotendipes nervosus
26
1.0
10
10.0
Goeldichironomus devineyae
76
2.0
30
60.0
Parachironomus sp.
66
1.1
30
33.0
Tanytarsus sp.
132
2.3
100
230.0
Ephemeroptera
Callibaetis sp.
8
1.1
3
3.4
Hemiptera
Abedus/Belostoma complex
10
1.0
10
10.0
Corixidae sp.
92
1.3
30
39.0
Trichocorixa sexcinta
14
1.0
10
10.0
Odonata
Enallagma sp.
38
1.5
30
45.0
Malacostraca
Amphipoda
Apocorophium lacustre
36
2.2
30
66.0
Apocorophium louisianum
48
2.2
30
66.0
Apocorophium sp.
194
2.2
100
220.0
Gammarus mucronatus
14
2.3
10
23.0
Gammarus tigrinus
300
2.0
100
200.0
Isopoda
Cassidinidea lunifrons
4
2.0
3
6.0
Edotia montosa
2
2.6
1
2.6
Maxillopoda
Sessilia
Balanus improvisus
2
2.0
1
2.0
Mollusca
Bivalvia
Mytilopsis leucophaeta
4
1.5
3
4.5
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
850
1,590.4
Estuarine Biotic Index = 1.87
Total taxa = 32
Total taxa with sensitivitv 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.
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