20080868 Ver 2_I-34 2014 Jacks Ponar Downstream Biotic Index Table_20150717

Table 1 -34. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacks Creek
downstream station in May 2014.
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Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)'
value (n)
(SV)(n)
Annelida
Oligochaeta
Peloscolex heterochaetus
1
1.1
1
1.1
Tubificidae sp. w/o hair
14
1.0
10
10.0
Polychaeta
Amphicteis floridus
20
2.0
10
20.0
Eteone heteropoda
3
1.6
3
4.8
Heteromastus filiformis
1
1.1
1
1.1
Marenzelleria viridis
12
2.6
10
26.0
Mediomastus ambiseta
1
2.0
1
2.0
Neanthes succinea
3
1.7
3
5.1
Streblospio benedicti
21
1.1
10
11.0
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
2
2.3
1
2.3
Chironomus decorus
45
1.0
30
30.0
Goeldichironomus devineyae
1
2.0
1
2.0
Tanypus neopunctipennis
1
1.0
1
1.0
Malacostraca
Amphipoda
Apocorophium sp.
3
2.2
3
6.6
Gammarus tigrinus
3
2.0
3
6.0
Isopoda
Cyathura polita
1
2.0
1
2.0
Edotia montosa
1
2.6
1
2.6
Mysida
Americamysis almyra
7
2.2
3
6.6
Mollusca
Bivalvia
Macoma balthica
11
1.5
10
15.0
Macoma tenta
20
2.0
10
20.0
Mulinia lateralis
1
2.3
1
2.3
Gastropoda
Littoridinops tenuipes
8
2.0
3
6.0
Total
117
183.5
Estuarine Biotic Index = 1.57
Total taxa = 23
Total taxa with sensitivity values = 22
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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