20080868 Ver 2_I-32 2014 Jacks Ponar Upstream Biotic Index Table_20150717

Table 1 -32. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacks Creek
upstream station in May 2014.
Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)`
value (n)
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
64
1.0
30
30.0
Polychaeta
Amphicteis f/oridus
174
2.0
100
200.0
Eteone heteropoda
4
1.6
3
4.8
Heteromastus filiformis
2
1.1
1
1.1
Laeonereis culveri
6
1.0
3
3.0
Polydora cornuta
4
1.2
3
3.6
Streb/ospio benedicti
12
1.1
10
11.0
Arthropoda
I nsecta
Diptera
Bezzia/Palmonyia complex
4
2.3
3
6.9
Chironomus decorus
286
1.0
100
100.0
Goe/dichironomus devineyae
4
2.0
3
6.0
Parachironomus sp.
18
1.1
10
11.0
Tanypus neopunctipennis
28
1.0
10
10.0
Tanytarsus sp.
24
2.3
10
23.0
Hemiptera
Corixidae sp.
2
1.3
1
1.3
Malacostraca
Amphipoda
Apocorophium sp.
16
2.2
10
22.0
Gammarus mucronatus
2
2.3
1
2.3
Gammarus tigrinus
122
2.0
100
200.0
Tanaidacea
Hargeria rapax
2
1.6
1
1.6
Mollusca
Bivalvia
Macoma balthica
4
1.5
3
4.5
Gastropoda
Littoridinops tenuipes
42
2.0
30
60.0
Total
432
702.1
Estuarine Biotic Index = 1.63
Total taxa = 24
Total taxa with sensitivity values = 20
a Only those taxa for which a sensitivity value is available are displayed.
bTotal number of individuals caught in all five ponar replicates.
1 -38

'Sensitivity values provided by NCDWR.
OR