20080868 Ver 2_I-34 2017 Jacks Ponar Downstream Biotic Index Table_20180629

Table 1-34. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacks Creek
downstream station in May 2017.
Species/taxona
Number of
individuals"
Sensitivity
value (SV)`
Abundance
value (n)
Product of
SV)(n)
Annelida
Polychaeta
Eteone heteropoda
11
1.6
10
16.0
Marenzelleria viridis
135
2.6
100
260.0
Mediomastus ambiseta
1
2.0
1
2.0
Streblospio benedicti
6
1.1
3
3.3
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
1
2.3
1
2.3
Dicrotendipes nervosus
1
1.0
1
1.0
Tanypus neopunctipennis
1
1.0
1
1.0
Hemiptera
Corixidae sp.
2
1.3
1
1.3
Trichocorixa sexcincta
1
1.0
1
1.0
Malacostraca
Amphipoda
Apocorophium lacustre
1
2.2
1
2.2
Apocorophium sp.
6
2.2
3
6.6
Gammarus tigrinus
43
2.0
30
60.0
Isopoda
Cyathura polity
1
2.0
1
2.0
Edotia montosa
1
2.6
1
2.6
Mysida
Americamysis almyra
5
2.2
3
6.6
Mollusca
Bivalvia
Macoma balthica
2
1.5
1
1.5
Rangia cuneata
79
1.0
30
30.0
Gastropoda
Littoridinops sp.
30
2.0
30
60.0
Total
219
459.4
Estuarine Biotic Index = 2.10
Total taxa = 18
Total taxa with sensitivitv values = 16
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.
1-40