20080868 Ver 2_I-32 2015 Jacks Ponar Upstream Biotic Index Table_20160708

Table 1-32. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacks Creek
upstream station in May 2015.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
3
1.0
3
3.0
Polychaeta
Amphicteis floridus
84
2.0
30
60.0
Eteone heteropoda
3
1.6
3
4.8
Laeonereis culvert
10
1.0
10
10.0
Streblospio benedicti
2
1.1
1
1.1
Arthropoda
Insecta
Diptera
Bezzia/Palmonyia complex
6
2.3
3
6.9
Chironomus decorus
8
1.0
3
3.0
Dicrotendipes nervosus
9
1.0
3
3.0
Goeldichironomus devineyae
19
2.0
10
20.0
Tanypus neopunctipennis
16
1.0
10
10.0
Tanytarsus sp.
14
2.3
10
23.0
Malacostraca
Amphipoda
Apocorophium louisianum
2
2.2
1
2.2
Apocorophium sp.
19
2.2
10
22.0
Gammarus tigrinus
97
2.0
30
60.0
Isopoda
Cyathura polita
2
2.0
1
2.0
Mysida
Americamysis almyra
2
2.2
1
2.2
Mollusca
Gastropoda
Littoridinops sp.
50
2.0
30
60.0
Total
159
293.2
Estuarine Biotic Index = 1.84
Total taxa = 18
Total taxa with sensitivitv 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.
f,