20080868 Ver 2_I-74 2017 Duck Ponar Downstream Biotic Index Table_20180629

Table 1-74. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Duck Creek
downstream station in May 2017.
Species/taxon a
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value (n)
Product of
SV)(n)
Annelida
Oligochaeta
Tubificoides heterochaetus
54
1.1
30
33.0
Polychaeta
Amphicteis floridus
244
2.0
100
200.0
Marenzelleria viridis
5
2.6
3
7.8
Mediomastus ambiseta
5
2.0
3
6.0
Polydora cornuta
5
1.2
3
3.6
Streblospio benedicti
40
1.1
30
33.0
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
3
2.3
3
6.9
Chironomus decorus
5
1.0
3
3.0
Glyptotendipes sp.
1
1.3
1
1.3
Procladius sp.
55
1.2
30
36.0
Tanypus neopunctipennis
4
1.0
3
3.0
Tanytarsus sp.
1
2.3
1
2.3
Malacostraca
Amphipoda
Apocorophium lacustre
31
2.2
30
66.0
Apocorophium sp.
42
2.2
30
66.0
Gammarus tigrinus
27
2.0
10
20.0
Leptocheirus plumulosus
1
3.0
1
3.0
Isopoda
Cyathura polita
3
2.0
3
6.0
Mysida
Americamysis almyra
1
2.2
1
2.2
Mollusca
Bivalvia
Macoma balthica
8
1.5
3
4.5
Macoma tenta
2
2.0
1
2.0
Mytilopsis leucophaeta
1
1.5
1
1.5
Rangia cuneata
12
1.0
10
10.0
Gastropoda
Littoridinops sp.
10
2.0
10
20.0
Total
310
537.1
Estuarine Biotic Index = 1.73
Total taxa = 25
Total taxa with sensitivitv values = 22
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.