20080868 Ver 2_I-82 2017 DCUT11 Ponar Downstream Biotic Index Table_20180629

Table 1-82. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the DCUT11
downstream station in May 2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value (n)
Product of
(SV)(n)
Annelida
Polychaeta
Amphicteis floridus
422
2.0
100
200.0
Arthropoda
Insecta
Coleoptera sp.
Berosus sp.
2
1.5
1
1.5
Diptera
Bezzia/Palpomyia complex
8
2.3
3
6.9
Parachironomus sp.
4
1.1
3
3.3
Polypedilum sp.
2
1.5
1
1.5
Tanypus neopuntipennis
2
1.0
1
1.0
Tanytarsus sp.
8
2.3
3
6.9
Odonata
Enallagma
2
1.5
1
1.5
Malacostraca
Amphipoda
Apocorophium lacustre
2
2.2
1
2.2
Apocorophium sp.
2
2.2
1
2.2
Gammarus tigrinus
440
2.0
100
200.0
Isopoda
Cassidinidea lunifrons
6
2.0
3
6.0
Cyathura polita
4
2.0
3
6.0
Mollusca
Bivalvia
Mytilopsis leucophaeta
50
1.5
30
45.0
Gastropoda
Littoridinops sp.
186
2.0
100
200.0
Total
351
684.0
Estuarine Biotic Index = 1.95
Total taxa = 18
Total taxa with sensitivity values = 14
a Only those taxa for which a sensitivity value is available are displayed.
bTotal number of individuals caught in all five ponar replicates.
° Sensitivity values provided by NCDWR.
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