20080868 Ver 2_I-74 2015 Duck Ponar Downstream Biotic Index Table_20160708

Table 1-74. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Duck Creek
downstream station in May 2015.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)'
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificoides heterochaetus
3
1.1
3
3.3
Polychaeta
Amphicteis floridus
8
2.0
3
6.0
Marenzelleria viridis
2
2.6
1
2.6
Streblospio benedicti
14
1.1
10
11.0
Arthropoda
Insecta
Diptera
Chironomus decorus
489
1.0
100
100.0
Coelotanypus sp.
2
1.8
1
1.8
Procladius sp.
1
1.2
1
1.2
Tanypus neopunctipennis
29
1.0
10
10.0
Tanytarsus sp.
30
2.3
30
69.0
Malacostraca
Amphipoda
Apocorophium sp.
2
2.2
1
2.2
Gammarus tigrinus
5
2.0
3
6.0
Mysida
Americamysis almyra
2
2.2
1
2.2
Mollusca
Bivalvia
Macoma tenta
1
2.0
1
2.0
Total
165
217.3
Estuarine Biotic Index = 1.32
Total taxa = 16
Total taxa with sensitivity values = 13
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.
10