20080868 Ver 2_I-18 2014 Muddy Sweep Downstream Biotic Index Table_20160708

Table 1-18. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Muddy Creek downstream station in
Mav 2015.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
3
1.0
3
3.0
Polychaeta
Amphicteis floridus
135
2.0
100
200.0
Eteone heteropoda
4
1.6
3
4.8
Marenzelleria viridis
3
2.6
3
7.8
Polydora cornuta
21
1.2
10
12.0
Arthropoda
Insecta
Coleoptera
Peltodytes sp.
4
1.4
3
4.2
Diptera
Apedilum sp.
2
4.0
1
4.0
Bezzia/Palmonyia complex
1
2.3
1
2.3
Chironomus decorus
138
1.0
100
100.0
Dicrotendipes nervosus
9
1.0
3
3.0
Goeldichironomus devineyae
92
2.0
30
60.0
Parachironomus sp.
16
1.1
10
11.0
Tanytarsus sp.
124
2.3
100
230.0
Hemiptera
Corixidae sp.
12
1.3
10
13.0
Trichocorixa sexcinta
8
1.0
3
3.0
Odonata
Enallagma sp.
4
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium lacustre
40
2.2
30
66.0
Apocorophium louisianum
94
2.2
30
66.0
Apocorophium sp.
292
2.2
100
220.0
Gammarus mucronatus
145
2.3
100
230.0
Gammarus tigrinus
240
2.0
100
200.0
Decapoda
Palaemonetes pugio
16
2.5
10
25.0
Rhithropanopeus harrisii
17
2.5
10
25.0
Isopoda
Cassidinidea lunifrons
2
2.0
1
2.0
Cyathura polita
25
2.0
10
20.0
Edotia montosa
7
2.6
3
7.8
Mysida
Americamysis almyra
36
2.2
30
66.0
Tanaidacea
Hargeria rapax
129
1.6
100
160.0
Mollusca
Bivalvia
Mytilopsis leucophaeata
2
1.5
1
1.5
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Physidae sp. (physa/physella)
4
1.4
3
4.2
Total
1011
1,956.1
Estuarine Biotic Index = 1.93
Total taxa = 32
Total taxa with sensitivity values = 29 1-24

20nly 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.
1-24