20080868 Ver 2_I-56 2014 Tooley Ponar Upstream Biotic Index Table_20150717

Table 1 -56. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Tooley 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
Oligochaeta
Tubificidae sp. w/ hair
1
1.0
1
1.0
Tubificidae sp. w/o hair
56
1.0
30
30.0
Polychaeta
Amphicteis floridus
3
2.0
3
6.0
Eteone heteropoda
11
1.6
10
16.0
Heteromastus filiformis
2
1.1
1
1.1
Marenzelleria viridis
3
2.6
3
7.8
Mediomastus ambiseta
1
2.0
1
2.0
Streblospio benedicti
9
1.1
3
3.3
Arthropoda
I nsecta
Diptera
Bezzia/Palmonyia complex
6
2.3
3
6.9
Chironomus decorus
38
1.0
30
30.0
Parachironomus sp.
1
1.1
1
1.1
Tanypus neopunctipennis
1
1.0
1
1.0
Malacostraca
Amphipoda
Apocorophium louisianum
2
2.2
1
2.2
Apocorophium sp.
7
2.2
3
6.6
Gammarus mucronatus
13
2.3
10
23.0
Gammarus tigrinus
3
2.0
3
6.0
Isopoda
Edotia montosa
2
2.6
1
2.6
Mysida
Americamysis almyra
3
2.2
3
6.6
Americamysis sp.
1
2.2
1
2.2
Tanaidacea
Hargeria rapax
1
1.6
1
1.6
Mollusca
Bivalvia
Macoma balthica
41
1.5
30
45.0
Macoma tenta
12
2.0
10
20.0
Gastropoda
Littoridinops tenuipes
13
2.0
10
20.0
Total
160
242.0
Estuarine Biotic Index = 1.51
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Total taxa = 23
Total taxa with sensitivity values = 23
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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