20080868 Ver 2_I-17 2017 Muddy Sweep Upstream Biotic Index Table_20180629

Table 1-17. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Muddy Creek upstream station in
May 2017.
Species/taxon a
Number of
individualsb
Sensitivity
value (SV)c
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Enchytraeidae sp.
12
1.0
10
10.0
Naididae sp. Wo hair
16
1.0
10
10.0
Paranais sp.
2
1.1
1
1.1
Polychaeta
Amphicteis floridus
134
2.0
100
200.0
Eteone heteropoda
2
1.6
1
1.6
Laeonereis culveri
2
1.0
1
1.0
Polydora cornuta
22
1.2
10
12.0
Arthropoda
Insecta
Diptera
Apedilum sp.
2
4.0
1
4.0
Bezzia/Palpomyia complex
12
2.3
10
23.0
Chironomus decorus
56
1.0
30
30.0
Cricotopus sp.
132
1.4
100
140.0
Dicrotendipes nervosus
8
1.0
3
3.0
Goeldichironomus devineyae
20
2.0
10
20.0
Parachironomus sp.
30
1.1
30
33.0
Tanytarsus sp.
84
2.3
30
69.0
Ephemeroptera
Callibaetis sp.
12
1.1
10
11.0
Hemiptera
Abedus/Belostoma complex
8
1.0
3
3.0
Corixidae sp.
106
1.3
100
130.0
Pelocoris femoratus
4
2.3
3
6.9
Trichocorixa sexcintca
14
1.0
10
10.0
Odonata
Enallagma sp.
24
1.5
10
15.0
Malacostraca
Amphipoda
Apocorophium lacustre
4
2.2
3
6.6
Apocorophium louisianum
128
2.2
100
220.0
Apocorophium sp.
300
2.2
100
220.0
Gammarus mucronatus
2
2.3
1
2.3
Gammarus tigrinus
300
2.0
100
200.0
Orchestia uhleri
2
2.0
1
2.0
Decapoda
Palaemonetes pugio
8
2.5
3
7.5
Rhithropanopeus harrisii
2
2.5
1
2.5
Isopoda
Cassidinidea lunifrons
14
2.0
10
20.0
Cyathura polita
2
2.0
1
2.0
Mollusca
Bivalvia
Mytilopsis leucophaeata
14
1.5
10
15.0
Gastropoda
Littoridinops sp.
236
2.0
100
200.0
Total
913
1,631.5
Estuarine Biotic Index = 1.79
Total taxa = 34
Total taxa with sensitivitv values = 30
'Only 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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