20080868 Ver 2_I-64 2014 Huddles Ponar Upstream Biotic Index Table_20150717

Table 1 -64. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Huddles Cut
upstream station in May 2013.
Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)`
value (n)
(SV)(n)
Annelida
Oligochaeta
Pe/osco/ex heterochaetus
29
1.1
10
11.0
Tubificidae sp. w/o hair
50
1.0
30
30.0
Polychaeta
Amphicteis floridus
12
2.0
10
20.0
Eteone heteropoda
2
1.6
1
1.6
Heteromastus filiformis
30
1.1
30
33.0
Laeonereis culveri
5
1.0
3
3.0
Marenzelleria viridis
3
2.6
3
7.8
Mediomastus ambiseta
14
2.0
10
20.0
Neanthes succinea
20
1.7
10
17.0
Arthropoda
Insecta
Diptera
Beezia/Palpomyia complex
2
2.3
1
2.3
Chironomus decorus
91
1.0
30
30.0
Goe/dichironomus devineyae
27
2.0
10
20.0
Tanypus neopunctipennis
3
1.0
3
3.0
Tanytarsus sp.
6
2.3
3
6.9
Malacostraca
Amphipoda
Apocorophium sp.
4
2.2
3
6.6
Gammarus tigrinus
50
2.0
30
60.0
Decapoda
Palaemonetes pugio
1
2.5
1
2.5
Mollusca
Bivalvia
Macoma balthica
14
1.5
10
15.0
Macoma sp.
3
1.5
3
4.5
Macoma tenta
120
2.0
100
200.0
Gastropoda
Littoridinops tenuipes
3
2.0
3
6.0
Total
304
500.2
Estuarine Biotic Index = 1.65
Total taxa = 21
Total taxa with sensitivity values = 21
a Only those taxa for which a sensitivity value is available are displayed.
bTotal number of individuals caught in all five ponar replicates.
1 -70

° Sensitivity values provided by NCDWR.
1 -70