20080868 Ver 2_I-36 2017 Jacobs Ponar Upstream Biotic Index Table_20180629

Table 1-36. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacobs Creek
upstream station in May 2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Naididae sp. w/o hair
2
1.0
1
1.0
Polychaeta
Amphicteis floridus
194
2.0
100
200.0
Eteone heteropoda
8
1.6
3
4.8
Laeonereis culveri
42
1.0
30
30.0
Marenzelleria viridis
28
2.6
10
26.0
Polydora cornuta
2
1.2
1
1.2
Streblospio benedicti
4
1.1
3
3.3
Arthropoda
Insecta
Coleoptera
Berosus sp.
6
1.5
3
4.5
Diptera
Apedilum sp.
2
4.0
1
4.0
Bezzia/Palmonyia complex
6
2.3
3
6.9
Chironomus decorus
4
1.0
3
3.0
Dicrotendipes nervosus
20
1.0
10
10.0
Tabanus sp.
2
1.4
1
1.4
Hemiptera
Corixidae sp.
38
1.3
30
39.0
Trichocriza sexcinta
8
1.0
3
3.0
Malacostraca
Amphipoda
Apocorophium lacustre
4
2.2
3
6.6
Apocorophium louisianum
50
2.2
30
66.0
Apocorophium sp.
140
2.2
100
220.0
Gammarus tigrinus
78
2.0
30
60.0
Mollusca
Bivalvia
Rangia cuneata
2
1.0
1
1.0
Gastropoda
Littoridinops sp.
322
2.0
100
200.0
Total
466
891.7
Estuarine Biotic Index = 1.91
Total taxa = 22
Total taxa with sensitivity values = 19
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