20080868 Ver 2_I-56 2017 Tooley Ponar Upstream Biotic Index Table_20180629

Table 1-56. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Tooley Creek
upstream station in May 2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Naididae sp. w/o hair
1
1.0
1
1.0
Polychaeta
Amphiceis floridus
3
2.0
3
6.0
Eteone heteropoda
5
1.6
3
4.8
Marenzelleria viridis
48
2.6
30
78.0
Streblospio benedicti
9
1.1
3
3.3
Arthropoda
Insecta
Diptera
Bezzia/Palmonyia complex
2
2.3
1
2.3
Chironomus decorus
27
1.0
10
10.0
Tanypus neopunctipennis
3
1.0
3
3.0
Tanytarsus sp.
6
2.3
3
6.9
Malacostraca
Amphipoda
Apocorophium lacustre
2
2.2
1
2.2
Apocorophium sp.
9
2.2
3
6.6
Gammarus tigrinus
41
2.0
30
60.0
Isopoda
Edotia montosa
3
2.6
3
7.8
Mysida
Americamysis almyra
6
2.2
3
6.6
Mollusca
Bivalvia
Macoma balthica
5
1.5
3
4.5
Rangia cuneata
6
1.0
3
3.0
Gastropoda
Littoridinops sp.
55
2.0
30
60.0
Total
133
266.0
Estuarine Biotic Index = 2.00
Total taxa = 19
Total taxa with sensitivity values = 16
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.
1-62