20080868 Ver 2_I-38 2017 Jacobs Ponar Downstream Biotic Index Table_20180629

Table 1-38. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacobs Creek
downstream station in May 2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)c
Abundance
value (n)
Product of
SV)(n)
Annelida
Oligochaeta
Tubificoides heterochaetus
13
1.1
10
11.0
Polychaeta
Amphicteis floridus
4
2.0
3
6.0
Eteone heteropoda
22
1.6
10
16.0
Heteromastus filiformis
2
1.1
1
1.1
Marenzellaria viridis
293
2.6
100
260.0
Mediomastus ambiseta
238
2.0
100
200.0
Streblospio benedicti
15
1.1
10
11.0
Arthropoda
Insecta
Diptera
Chironomus decorus
2
1.0
1
1.0
Tanypus neopunctipennis
2
1.0
1
1.0
Malacostraca
Amphipoda
Apocorophium lacustre
8
2.2
3
6.6
Apocorophium sp.
7
2.2
3
6.6
Gammarus mucronatus
1
2.3
1
2.3
Gammarus tigrinus
74
2.0
30
60.0
Isopoda
Cyathura polity
8
2.0
3
6.0
Edotia montosa
9
2.6
3
7.8
Mysida
Americamysis almyra
14
2.2
10
22.0
Mollusca
Bivalvia
Macoma balthica
8
1.5
3
4.5
Macoma tenta
34
2.0
30
60.0
Macoma sp.
1
1.5
1
1.5
Rangia cuneata
61
1.0
30
30.0
Gastropoda
Littoridinops sp.
38
2.0
30
60.0
Total
383
774.4
Estuarine Biotic Index = 2.02
Total taxa = 21
Total taxa with sensitivitv values = 19
a Only those taxa for which a sensitivity value is available are displayed
bTotal number of individuals caught in all five ponar replicates.
Sensitivity values provided by NCDWR.
1-44