20080868 Ver 2_I-78 2014 DCUT19 Ponar Downstream Biotic Index Table_20150717

Table 1 -78. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the DCUT19
downstream 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
428
1.0
100
100.0
Polychaeta
Amphicteis floridus
12
2.0
10
20.0
Heteromastus filiformis
12
1.1
10
11.0
Marenzellaria viridis
48
2.6
30
78.0
Mediomastus ambiseta
12
2.0
10
20.0
Neanthes succinea
27
1.7
10
17.0
Polydora cornuta
4
1.2
3
3.6
Streblospio benedicti
8
1.1
3
3.3
Arthropoda
Insecta
Diptera
Beezia/Palpomyia complex
23
2.3
10
23.0
Dicrotendipes nervosus
8
1.0
3
3.0
Goeldichironomus devineyae
20
2.0
10
20.0
Parachironomus sp.
20
1.1
10
11.0
Polypedilum sp.
3
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium lacustre
4
2.2
3
6.6
Apocorophium louisianum
4
2.2
3
6.6
Apocorophium sp.
24
2.2
10
22.0
Gammarus mucronatus
8
2.3
3
6.9
Gammarus tigrinus
500
2.0
100
200.0
Decapoda
Rhithropanopeus harrisii
3
2.5
3
7.5
Isopoda
Cyathura polita
24
2.0
10
20.0
Edotia montosa
4
2.6
3
7.8
Tanaidacea
Hargeria rapax
128
1.6
100
160.0
Mollusca
Bivalvia
Macoma tenta
19
2.0
10
20.0
Gastropoda
Littoridinops tenuipes
95
2.0
30
60.0
Total
Estuarine Biotic Index = 1.71
487 831.8

Total taxa = 24
Total taxa with sensitivity values = 24
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.
MI