20080868 Ver 2_I-56 2015 Tooley Ponar Upstream Biotic Index Table_20160708

Table 1-56. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Tooley Creek
upstream station in May 2015.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Polychaeta
Amphicteis floridus
5
2.0
3
6.0
Eteone heteropoda
2
1.6
1
1.6
Polydora cornuta
4
1.2
3
3.6
Streblospio benedicti
8
1.1
3
3.3
Arthropoda
Insecta
Diptera
Bezzia/Palmonyia complex
7
2.3
3
6.9
Chironomus decorus
77
1.0
30
30.0
Tanypus neopunctipennis
13
1.0
10
10.0
Tanytarsus sp.
22
2.3
10
23.0
Malacostraca
Amphipoda
Apocorophium /ouisianum
10
2.2
10
22.0
Apocorophium sp.
44
2.2
30
66.0
Gammarus tigrinus
7
2.0
3
6.0
Isopoda
Edotia montosa
1
2.6
1
2.6
Mysida
Americamysis almyra
7
2.2
3
6.6
Tanaidacea
Hargeria rapax
1
1.6
1
1.6
Mollusca
Bivalvia
Macoma balthica
2
1.5
1
1.5
Macoma tenta
3
2.0
3
6.0
Gastropoda
Littoridinops sp.
13
2.0
10
20.0
Total
125
216.7
Estuarine Biotic Index = 1.73
Total taxa = 19
Total taxa with sensitivity values = 16
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 NCDW R.
1-64