20080868 Ver 2_I-70 2015 Porter Ponar Downstream Biotic Index Table_20160708

Table 1-70. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Porter Creek
downstream station in May 2015.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Polychaeta
Amphicteis floridus
12
2.0
10
20.0
Streblospio benedicti
79
1.1
30
33.0
Arthropoda
Insecta
Diptera
Chironomus decorus
500
1.0
100
100.0
Dicrotendipes nervosus
1
1.0
1
1.0
Malacostraca
Amphipoda
Apocorophium sp.
1
2.2
1
2.2
Gammarus tigrinus
12
2.0
10
20.0
Mysida
Americamysis almyra
2
2.2
1
2.2
Mollusca
Bivalvia
Macoma balthica
9
1.5
3
4.5
Macoma tenta
7
2.0
3
6.0
Gastropoda
Littoridinops sp.
3
2.0
3
6.0
Total
162
194.9
Estuarine Biotic Index = 1.20
Total taxa = 11
Total taxa with sensitivity values = 10
a Only those taxa for which asSensitivity value is available are displayed.
bTotal number of individuals caught in all five pnar replicates.
° Sensitivity values provided by NCDW R.
I