20080868 Ver 2_I-8 2017 PA2 Sweep Downstream Biotic Index Table_20180629

Table 1-8. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the PA2 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.
8
1.0
3
3.0
Naididae sp. w/o hair
2
1.0
1
1.0
Polychaeta
Amphicteis floridus
54
2.0
30
60.0
Laeonereis culveri
4
1.0
3
3.0
Marenzelleria viridis
1
2.6
1
2.6
Arthropoda
Insecta
Coleoptera
Berosus sp.
3
1.5
3
4.5
Diptera
Apedilum sp.
2
4.0
1
4.0
Bezzia/Palpomyia complex
1
2.3
1
2.3
Dicrotendipes nervosus
3
1.0
3
3.0
Goeldichironomus devineyae
42
2.0
30
60.0
Tanytarsus sp.
2
2.3
1
2.3
Ephemeroptera
Baetis sp.
2
2.5
1
2.5
Hemiptera
Corixidae sp.
251
1.3
100
130.0
Trichocorixa sexcintca
111
1.0
100
100.0
Odonata
Enallagma sp.
3
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium lacustre
31
2.2
30
66.0
Apocorophium louisianum
66
2.2
30
66.0
Apocorophium sp.
217
2.2
100
220.0
Gammarus tigrinus
155
2.0
100
200.0
Uhlorchestia uhleri
4
2.0
3
6.0
Decapoda
Palaemonetes pugio
16
2.5
10
25.0
Isopoda
Cassidinidea lunifrons
37
2.0
30
60.0
Cyathura polita
1
2.0
1
2.0
Mysida
Americamysis almyra
1
2.2
1
2.2
Maxillopoda
Sessilia
Balanus improvisus
1
2.0
1
2.0
Mollusca
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
687
1,231.9
Estuarine Biotic Index = 1.79
Total taxa = 29
Total taxa with sensitivitv values = 24
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.
1-12