20080868 Ver 2_I-36 2015 Jacobs Ponar Upstream Biotic Index Table_20160708

Table 1-36. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacobs 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
204
2.0
100
200.0
Eteone heteropoda
4
1.6
3
4.8
Streblospio benedicti
16
1.1
10
11.0
Arthropoda
Insecta
Coleoptera
Berosus sp.
3
1.5
3
4.5
Diptera
Bezzia/Palmonyia complex
20
2.3
10
23.0
Chironomus decorus
16
1.0
10
10.0
Goeldichironomus devineyae
6
2.0
3
6.0
Parachironomus sp.
2
1.1
1
1.1
Tanypus neopunctipennis
94
1.0
30
30.0
Tanytarsus sp.
103
2.3
100
230.0
Malacostraca
Amphipoda
Apocorophium louisianum
10
2.2
10
22.0
Apocorophium sp.
249
2.2
100
220.0
Gammarus tigrinus
269
2.0
100
200.0
Decapoda
Rhithropanopeus harisii
2
2.5
1
2.5
Mollusca
Bivalvia
Macoma balthica
2
1.5
1
1.5
Macoma tenta
3
2.0
3
6.0
Mytilopsis leucophaeta
4
1.5
3
4.5
Gastropoda
Littoridinops sp.
116
2.0
100
200.0
Total
591
1179.9
Estuarine Biotic Index = 2.00
Total taxa = 23
Total taxa with sensitivity values = 18
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.
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