20080868 Ver 2_I-40 2015 PA2 Ponar Upstream Biotic Index Table_20160708

Table 1-40. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the PA2 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
5
1.0
3
3.0
Polychaeta
Amphicteis floridus
30
2.0
30
60.0
Eteone heteropoda
11
1.6
10
16.0
Marenzelleria viridis
5
2.6
3
7.8
Polydora cornuta
1
1.2
1
1.2
Streblospio benedicti
5
1.1
3
3.3
Arthropoda
Insecta
Diptera
Chironomus decorus
384
1.0
100
100.0
Tanypus neopunctipennis
29
1.0
10
10.0
Tanytarsus sp.
25
2.3
10
23.0
Malacostraca
Amphipoda
Apocorophium sp.
2
2.2
1
2.2
Gammarus tigrinus
26
2.0
10
20.0
Mysida
Americamysis almyra
3
2.2
3
6.6
Americamysis bigelowi
1
4.0
1
4.0
Mollusca
Bivalvia
Mytilopsis leucophaeta
1
1.5
1
1.5
Gastropoda
Littoridinops sp.
27
2.0
10
20.0
Total
196
278.6
Estuarine Biotic Index = 1.42
Total taxa = 18
Total taxa with sensitivity values = 15
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.