20080868 Ver 2_I-4 2015 Jacks Sweep Downstream Biotic Index Table_20160708

Table 1-4. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Jacks Creek downstream station in
May 2015.
Species/taxon'
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value (n)
Product of
(SV)(n)
Annelida
Polychaeta
Amphecteis floridus
7
2.0
3
6.0
Marenzelleria viridis
1
2.6
1
2.6
Polydora cornuta
9
1.2
3
3.6
Streblospio benedicti
2
1.1
1
1.1
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
1
2.3
1
2.3
Chironomus decorus
77
1.0
30
30.0
Dicrotendipes nervosus
13
1.0
10
10.0
Goeldichironomus devineyae
4
2.0
3
6.0
Parachironomus sp.
57
1.1
30
33.0
Procladius sp.
2
1.2
1
1.2
Tanytarsus sp.
16
2.3
10
23.0
Ephemeroptera
Callibaetis sp.
1
1.1
1
1.1
Hemiptera
Abedus/Belostoma sp.
3
1.0
3
3.0
Corixidae sp.
4
1.3
3
3.9
Odonata
Enallagma sp.
3
1.5
3
4.5
Malacostraca
Amphipoda
Apocophorium lacustre
44
2.2
30
66.0
Apocorophium sp.
232
2.2
100
220.0
Gammarus mucronatus
22
2.3
10
23.0
Gammarus tigrinus
300
2.0
100
200.0
Decapoda
Palaemonetes pugio
11
2.5
10
25.0
Rhithropanopeus harrisii
130
2.5
100
250.0
Isopoda
Cassidinidea lunifrons
13
2.0
10
20.0
Cyathura polita
6
2.0
3
6.0
Edotia montosa
12
2.6
10
26.0
Mysida
Americamysis almyra
135
2.2
100
220.0
Tanaidacea
Hargeria rapax
59
1.6
30
48.0
Mollusca
Bivalvia
Mytilopsis leucophaeata
35
1.5
30
45.0
Mulinia lateralis
2
2.3
1
2.3
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
737
1,482.6
Estuarine Biotic Index = 2.01
Total taxa = 31
Total taxa with sensitivity values = 28
1-10

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.
1-10