20080868 Ver 2_I-72 2015 Duck Ponar Upstream Biotic Index Table_20160708

Table 1-72. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Duck Creek
upstream station in May 2015.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
10
1.0
10
10.0
Polychaeta
Amphicteis floridus
199
2.0
100
200.0
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
16
2.3
10
23.0
Chironomus decorus
33
1.0
30
30.0
Dicrotendipes nervosus
28
1.0
10
10.0
Parachironomus sp.
7
1.1
3
3.3
Tanypus neopunctipennis
4
1.0
3
3.0
Tanytarsus sp.
33
2.3
30
69.0
Malacostraca
Amphipoda
Apocorophium sp.
4
2.2
3
6.6
Gammarus tigrinus
115
2.0
100
200.0
Mollusca
Gastropoda
Littoridinops sp.
20
2.0
10
20.0
Total
309
574.9
Estuarine Biotic Index = 1.86
Total taxa = 16
Total taxa with sensitivity values = 11
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.
IX