20080868 Ver 2_I-68 2015 Porter Ponar Upstream Biotic Index Table_20160708

Table 1-68. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Porter 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
6
1.0
3
3.0
Polychaeta
Amphicteis floridus
484
2.0
100
200.0
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
6
2.3
3
6.9
Dicrotendipes nervosus
6
1.0
3
3.0
Tanypus neopunctipennis
13
1.0
10
10.0
Tanytarsus sp.
2
2.3
1
2.3
Malacostraca
Amphipoda
Apocorophium lacustre
11
2.2
10
22.0
Apocorophium louisianum
2
2.2
1
2.2
Apocorophium sp.
41
2.2
30
66.0
Gammarus tigrinus
177
2.0
100
200.0
Isopoda
Cassidinidea lunifrons
2
2.0
1
2.0
Cyathura polita
6
2.0
3
6.0
Mollusca
Bivalvia
Mytilopsis leucophaeata
29
1.5
10
15.0
Gastropoda
Littoridinops sp.
13
2.0
10
20.0
Total
285
558.4
Estuarine Biotic Index = 1.96
Total taxa = 18
Total taxa with sensitivity values = 13
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.
ISL