20080868 Ver 2_I-78 2015 DCUT19 Ponar Downstream Biotic Index Table_20160708

Table 1-78. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the DCUT19
downstream station in May 2015.
Species/taxon'
Number of
individualsb
Sensitivity
value (SV)'
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
47
1.0
30
30.0
Tubificoides heterochaetus
32
1.1
30
33.0
Polychaeta
Amphicteis floridus
395
2.0
100
200.0
Laeonereis culveri
74
1.0
30
30.0
Marenzellaria viridis
32
2.6
30
78.0
Polydora cornuta
3
1.2
3
3.6
Streblospio benedicti
12
1.1
10
11.0
Arthropoda
Insecta
Diptera
Beezia/Palpomyia complex
80
2.3
30
69.0
Chironomus decorus
165
1.0
100
100.0
Dicrotendipes nervosus
82
1.0
30
30.0
Goeldichironomus devineyae
7
2.0
3
6.0
Nanocladius sp.
3
2.0
3
6.0
Parachironomus sp.
47
1.1
30
33.0
Polypedilum sp.
8
1.5
3
4.5
Tanytarsus sp.
156
2.3
100
230.0
Malacostraca
Amphipoda
Apocorophium sp.
21
2.2
10
22.0
Gammarus tigrinus
296
2.0
100
200.0
Isopoda
Cassidinidea lunifrons
4
2.0
3
6.0
Cyathura polita
56
2.0
30
60.0
Edotia montosa
55
2.6
30
78.0
Mysida
Americamysis almyra
12
2.2
10
22.0
Tanaidacea
Hargeria rapax
62
1.6
30
48.0
Mollusca
Bivalvia
Rangia cuneata
3
1.0
3
3.0
Gastropoda
Littoridinops sp.
47
2.0
30
60.0
Total
1
778
1363.1
Estuarine Biotic Index = 1.75

Total taxa = 27
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.