20080868 Ver 2_I-52 2015 Long Ponar Upstream Biotic Index Table_20160708

Table 1-52. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Long 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
16
1.0
10
10.0
Tubificoides heterochaetus
1
1.1
1
1.1
Polychaeta
Amphicteis floridus
17
2.0
10
20.0
Eteone heteropoda
11
1.6
10
16.0
Mediomastus ambiseta
1
2.0
1
2.0
Streblospio benedicti
48
1.1
30
33.0
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
2
2.3
1
2.3
Chironomus decorus
320
1.0
100
100.0
Tanypus neopunctipennis
33
1.0
30
30.0
Tanytarsus sp.
10
2.3
10
23.0
Malacostraca
Amphipoda
Apocorophium louisianum
8
2.2
3
6.6
Apocorophium sp.
58
2.2
30
66.0
Gammarus mucronatus
19
2.3
10
23.0
Gammarus tigrinus
49
2.0
30
60.0
Mysida
Americamysis almyra
2
2.2
1
2.2
Mollusca
Bivalvia
Macoma balthica
2
1.5
1
1.5
Macoma tenta
7
2.0
3
6.0
Gastropoda
Littoridinops sp.
10
2.0
10
20.0
Total
291
422.7
Estuarine Biotic Index = 1.45
Total taxa = 19
Total taxa with sensitivity values = 16
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.