20080868 Ver 2_I-82 2015 DCUT11 Ponar Downstream Biotic Index Table_20160708

Table 1-82. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the DCUT11
downstream 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)
4
1.0
3
3.0
Polychaeta
Amphicteis floridus
358
2.0
100
200.0
Laeonereis culvert
12
1.0
10
10.0
Marenzelleria viridis
4
2.6
3
7.8
Streblospio benedicti
15
1.1
10
11.0
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
10
2.3
10
23.0
Chironomus decorus
17
1.0
10
10.0
Dicrotendipes nervosus
196
1.0
100
100.0
Tanypus neopunctipennis
2
1.0
1
1.0
Malacostraca
Amphipoda
Apocorophium lacustre
20
2.2
10
22.0
Apocorophium sp.
44
2.2
30
66.0
Gammarus tigrinus
332
2.0
100
200.0
Decapoda
Rhithropanopeus harrisii
9
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
6
2.0
3
6.0
Cyathura polita
20
2.0
10
20.0
Mysida
Americamysis almyra
7
2.2
3
6.6
Mollusca
Bivalvia
Rangia cuneata
1
1.0
1
1.0
Gastropoda
Littoridinops sp.
4
2.0
3
6.0
Total
410
700.9
Estuarine Biotic Index = 1.71
Total taxa = 22
Total taxa with sensitivity values = 17
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.
ff