20080868 Ver 2_I-68 2014 Porter Ponar Upstream Biotic Index Table_20150717

Table 1 -68. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Porter Creek
upstream station in May 2014.
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Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)`
value (n)
(SV)(n)
Annelida
Polychaeta
Amphicteis floridus
333
2.0
100
200.0
Marenzelleria viridis
1
2.6
1
2.6
Mediomastus ambiseta
2
2.0
1
2.0
Polydora cornuta
4
1.2
3
3.6
Streblospio benedicti
256
1.1
100
110.0
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
10
2.3
10
23.0
Chironomus decorus
44
1.0
30
30.0
Dicrotendipes nervosus
6
1.0
3
3.0
Parachironomus sp.
6
1.1
3
3.3
Tanypus neopunctipennis
12
1.0
10
10.0
Tanytarsus sp.
205
2.3
100
230.0
Malacostraca
Amphipoda
Apocorophium lacustre
2
2.2
1
2.2
Apocorophium louisianum
4
2.2
3
6.6
Apocorophium sp.
16
2.2
10
22.0
Gammarus tigrinus
122
2.0
100
200.0
Isopoda
Cyathura polita
10
2.0
10
20.0
Mysida
Americamysis bigelowi
2
4.0
1
4.0
Mollusca
Bivalvia
Mytilopsis leucophaeata
13
1.5
10
15.0
Gastropoda
Littoridinops tenuipes
82
2.0
30
60.0
Total
526
947.3
Estuarine Biotic Index = 1.80
Total taxa = 21
Total taxa with sensitivity values = 19
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 NCDWR.
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