20080868 Ver 2_I-58 2017 Tooley Ponar Downstream Biotic Index Table_20180629

Table 1-58. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Tooley Creek
downstream station in May 2017.
Species/taxona
Number of
individuals"
Sensitivity
value (SV)`
Abundance
value (n)
Product of
SV)(n)
Annelida
Oligochaeta
Tublficoides heterochaetus
78
1.1
30
33.0
Polychaeta
Amphicteis floridus
1
2.0
1
2.0
Eteone heteropoda
25
1.6
10
16.0
Heteromastus filiformis
1
1.1
1
1.1
Marenzelleria viridis
130
2.6
100
260.0
Mediomastus ambiseta
126
2.0
100
200.0
Polydora cornuta
1
1.2
1
1.2
Streblospio benedicti
30
1.1
30
33.0
Arthropoda
Insecta
Diptera
Chironomus decorus
1
1.0
1
1.0
Coelotanypus sp.
2
1.8
1
1.8
Procladius sp.
1
1.2
1
1.2
Tanypus neopunctipennis
28
1.0
10
10.0
Malacostraca
Amphipoda
Apocorophium sp.
3
2.2
3
6.6
Gammarus mucronatus
2
2.3
1
2.3
Gammarus tigrinus
21
2.0
10
20.0
Isopoda
Cyathrua polita
8
2.0
3
6.0
Edotia montosa
3
2.6
3
7.8
Mysida
Americamysis almyra
3
2.2
3
6.6
Mollusca
Bivalvia
Macoma balthica
27
1.5
10
15.0
Macoma tenta
13
2.0
10
20.0
Rangia cuneata
133
1.0
100
100.0
Gastropoda
Littoridinops sp.
31
2.0
30
60.0
Total
459
804.6
Estuarine Biotic Index = 1.75
Total taxa = 23
Total taxa with sensitivitv values = 22
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.
1-64