20080868 Ver 2_I-34 2015 Jacks Ponar Downstream Biotic Index Table_20160708

Table 1-34. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacks Creek
downstream station in May 2015.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)'
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
59
1.0
30
30.0
Polychaeta
Amphicteis floridus
10
2.0
10
20.0
Eteone heteropoda
11
1.6
10
16.0
Heteromastus filiformis
3
1.1
3
3.3
Laeonereis culveri
1
1.0
1
1.0
Marenzelleria viridis
5
2.6
3
7.8
Mediomastus ambiseta
3
2.0
3
6.0
Streblospio benedicti
162
1.1
100
110.0
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
4
2.3
3
6.9
Chironomus decorus
335
1.0
100
100.0
Dicrotendipes nervosus
1
1.0
1
1.0
Goeldichironomus devineyae
6
2.0
3
6.0
Tanytarsus sp.
19
2.3
10
23.0
Malacostraca
Amphipoda
Apocorophium lacustre
12
2.2
10
22.0
Apocorophium sp.
12
2.2
10
22.0
Gammarus tigrinus
68
2.0
30
60.0
Isopoda
Cyathura polita
2
2.0
1
2.0
Edotia montosa
2
2.6
1
2.6
Mysida
Americamysis almyra
7
2.2
3
6.6
Mollusca
Bivalvia
Macoma balthica
12
1.5
10
15.0
Macoma tenta
10
2.0
10
20.0
Gastropoda
Littoridinops sp.
54
2.0
30
60.0
Total
382
541.2
Estuarine Biotic Index = 1.42
Total taxa = 25
Total taxa with sensitivity values = 21
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.
1-42