20080868 Ver 2_I-58 2015 Tooley Ponar Downstream Biotic Index Table_20160708

Table 1-58. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Tooley Creek
downstream station in May 2015.
Species/taxon'
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificoides heterochaetus
114
1.1
100
110.0
Polychaeta
Amphicteis floridus
2
2.0
1
2.0
Eteone heteropoda
21
1.6
10
16.0
Heteromastus filiformis
3
1.1
3
3.3
Marenzelleria viridis
12
2.6
10
26.0
Mediomastus ambiseta
139
2.0
100
200.0
Streblospio benedicti
113
1.1
100
110.0
Arthropoda
Insecta
Diptera
Chironomus decorus
500
1.0
100
100.0
Tanypus neopunctipennis
8
1.0
3
3.0
Tanytarsus sp.
7
2.3
3
6.9
Malacostraca
Amphipoda
Apocorophium sp.
2
2.2
1
2.2
Gammarus tigrinus
4
2.0
3
6.0
Isopoda
Cyathrua polita
1
2.0
1
2.0
Edotia montosa
1
2.6
1
2.6
Mysida
Americamysis almyra
2
2.2
1
2.2
Mollusca
Bivalvia
Macoma balthica
8
1.5
3
4.5
Macoma tenta
46
2.0
30
60.0
Mytilopsis leucophaeta
1
1.5
1
1.5
Gastropoda
Littoridinops sp.
10
2.0
10
20.0
Total
481
678.2
Estuarine Biotic Index = 1.41
Total taxa = 20
Total taxa with sensitivity values = 19
' 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.