20080868 Ver 2_I-32 2017 Jacks Ponar Upstream Biotic Index Table_20180629

Table 1-32. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacks Creek
upstream station in May 2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance Product of
value (n) (SV)(n)
Annelida
Polychaeta
Amphicteis floridus
54
2.0 30
60.0
Eteone heteropoda
1
1.6 1
1.6
Streblospio benedicti
2
1.1 1
1.1
Arthropoda
Insecta
Diptera
Apedilum sp.
2
4.0 1
4.0
Bezzia/Palmonyia complex
8
2.3 3
6.9
Chironomus decorus
54
1.0 30
30.0
Dicrotendipes nervosus
38
1.0 30
30.0
Parachironomus sp.
6
1.1 3
3.3
Tanypus neopunctipennis
5
1.0 3
3.0
Tanytarsus sp.
66
2.3 30
69.0
Hemiptera
Corixidae sp.
6
1.3 3
3.9
Pelocoris femoratus
1
2.3 1
2.3
Trichoptera
Oecetis inconspicua
1
4.6 1
4.6
Malacostraca
Amphipoda
Apocorophium lacustre
2
2.2 1
2.2
Apocorophium sp.
8
2.2 3
6.6
Gammarus tigrinus
162
2.0 100
200.0
Mollusca
Bivalvia
Rangia cuneata
4
1.0 3
3.0
Gastropoda
Littoridinops sp.
71
2.0 30
60.0
Total
274
491.5
Estuarine Biotic Index = 1.80
Total taxa = 19
Total taxa with sensitivitv values = 17
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.
IM