20080868 Ver 2_I-72 2017 Duck Ponar Upstream Biotic Index Table_20180629

Table 1-72. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Duck Creek
upstream station in May 2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Naididae sp. w/o hair
64
1.0
30
30.0
Polychaeta
Amphicteis floridus
254
2.0
100
200.0
Mediomastus ambiseta
4
2.0
3
6.0
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
4
2.3
3
6.9
Procladius sp.
26
1.2
10
12.0
Tanytarsus sp.
4
2.3
3
6.9
Malacostraca
Amphipoda
Gammarus tigrinus
70
2.0
30
60.0
Mollusca
Gastropoda
Littoridinops sp.
54
2.0
30
60.0
Total
209
381.8
Estuarine Biotic Index = 1.83
Total taxa = 11
Total taxa with sensitivity values = 8
a Only those taxa for which a sensitivity value is available are displayed
b Total number of individuals caught in all five ponar replicates.
° Sensitivity values provided by NCDWR.
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