20080868 Ver 2_I-4 2017 Jacks Sweep Downstream Biotic Index Table_20180629

Table 1-4. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Jacks Creek downstream station in
May 2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)'
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Enchytraeidae sp.
1
1.0
1
1.0
Naididae sp. w/o hair
2
1.0
1
1.0
Paranais sp.
1
1.1
1
1.1
Tubificoides heterochaetus
2
1.1
1
1.1
Polychaeta
Amphecteis floridus
6
2.0
3
6.0
Marenzelleria viridis
5
2.6
3
7.8
Arthropoda
Insecta
Diptera
Dicrotendipes nervosus
9
1.0
3
3.0
Goeldichironomus devineyae
1
2.0
1
2.0
Hemiptera
Corixidae sp.
3
1.3
3
3.9
Trichocorixa sexcintca
2
1.0
1
1.0
Malacostraca
Amphipoda
Apocophorium lacustre
38
2.2
30
66.0
Apocophorium sp.
124
2.2
100
220.0
Gammarus tigrinus
224
2.0
100
200.0
Uhlorchestia uhleri
3
2.0
3
6.0
Decapoda
Palaemonetes pugio
5
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
8
2.0
3
6.0
Cyathura polita
2
2.0
1
2.0
Edotia montosa
1
2.6
1
2.6
Mysida
Americamysis almyra
4
2.2
3
6.6
Maxillopoda
Sessila
Balanus subalbidus
3
2.0
3
6.0
Mollusca
Bivalvia
Mytilopsis leucophaeata
7
1.5
3
4.5
Rangia cuneata
3
1.0
3
3.0
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
371
758.1
Estuarine Biotic Index = 2.04
Total taxa = 24
Total taxa with sensitivitv values = 20
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.
ID