20080868 Ver 2_I-70 2014 Porter Ponar Downstream Biotic Index Table_20150717

Table 1 -70. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Porter Creek
downstream station in May 2014.
Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)`
value (n)
(SV)(n)
Annelida
Polychaeta
Heteromastus filiformis
3
1.1
3
3.3
Mediomastus ambiseta
33
2.0
30
60.0
Streblospio benedicti
30
1.1
30
33.0
Arthropoda
I nsecta
Diptera
Chironomus decorus
197
1.0
100
100.0
Tanypus neopunctipennis
63
1.0
30
30.0
Malacostraca
Amphipoda
Apocorophium sp.
1
2.2
1
2.2
Gammarus tigrinus
1
2.0
1
2.0
Mollusca
Bivalvia
Macoma balthica
34
1.5
30
45.0
Macoma tenta
58
2.0
30
60.0
Mulinia lateralis
1
2.3
1
2.3
Gastropoda
Littoridinops tenuipes
4
2.0
3
6.0
Total
259
343.8
Estuarine Biotic Index = 1.33
Total taxa = 11
Total taxa with sensitivity values = 11
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 NCDWR.
1 -76