20080868 Ver 2_I-72 2014 Duck Ponar Upstream Biotic Index Table_20150717

Table 1 -72. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Duck Creek
upstream station in May 2014.
Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)`
value (n)
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
19
1.0
10
10.0
Polychaeta
Amphicteis floridus
500
2.0
100
200.0
Streblospio benedicti
9
1.1
3
3.3
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
14
2.3
10
23.0
Chironomus decorus
500
1.0
100
100.0
Dicrotendipes nervosus
150
1.0
100
100.0
Parachironomus sp.
12
1.1
10
11.0
Tanypus neopunctipennis
101
1.0
100
100.0
Tanytarsus sp.
44
2.3
30
69.0
Malacostraca
Amphipoda
Apocorophium sp.
12
2.2
10
22.0
Gammarus tigrinus
221
2.0
100
200.0
Mollusca
Gastropoda
Littoridinops tenuipes
191
2.0
100
200.0
Total
673
1,038.3
Estuarine Biotic Index = 1.54
Total taxa = 15
Total taxa with sensitivity values = 12
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.