20080868 Ver 2_I-54 2014 Long Ponar Downstream Biotic Index Table_20150717

Table 1 -54. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Long Creek
downstream 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
1
1.0
1
1.0
Polychaeta
Eteone heteropoda
1
1.6
1
1.6
Marenzelleria viridis
2
2.6
1
2.6
Mediomastus ambiseta
5
2.0
3
6.0
Neanthes succinea
5
1.7
3
5.1
Polydora cornuta
1
1.2
1
1.2
Streblospio benedicti
4
1.1
3
3.3
Arthropoda
I nsecta
Diptera
Chironomus decorus
148
1.0
100
100.0
Hemiptera
Corixidae sp.
1
1.3
1
1.3
Malacostraca
Mysida
Americamysis almyra
1
2.2
1
2.2
Mollusca
Bivalvia
Macoma balthica
24
1.5
10
15.0
Macoma tenta
78
2.0
30
60.0
Gastropoda
Littoridinops tenuipes
1
2.0
1
2.0
Total
156
201.3
Estuarine Biotic Index = 1.29
Total taxa = 14
Total taxa with sensitivity values = 13
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.
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