20080868 Ver 2_I-74 2014 Duck Ponar Downstream Biotic Index Table_20150717

Table 1 -74. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Duck Creek
downstream station in May 2014.
Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)`
value (n)
(SV)(n)
Annelida
Polychaeta
Amphicteis floridus
5
2.0
3
6.0
Marenzelleria viridis
1
2.6
1
2.6
Mediomastus ambiseta
8
2.0
3
6.0
Streblospio benedicti
56
1.1
30
33.0
Arthropoda
Insecta
Diptera
Chironomus decorus
500
1.0
100
100.0
Goeldichironomus devineyae
3
2.0
3
6.0
Tanytarsus sp.
1
2.3
1
2.3
Malacostraca
Amphipoda
Apocorophium lacustre
1
2.2
1
2.2
Gammarus tigrinus
7
2.0
3
6.0
Isopoda
Edotia montosa
2
2.6
1
2.6
Mysida
Americamysis almyra
7
2.2
3
6.6
Tanaidacea
Hargeria rapax
2
1.6
1
1.6
Mollusca
Bivalvia
Macoma balthica
9
1.5
3
4.5
Macoma tenta
13
2.0
10
20.0
Gastropoda
Littoridinops tenuipes
15
2.0
10
20.0
Total
173
219.4
Estuarine Biotic Index = 1.27
Total taxa = 16
Total taxa with sensitivity values = 15
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.
:1