20080868 Ver 2_I-76 2017 DCUT19 Ponar Upstream Biotic Index Table_20180629

Table 1-76. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the DCUT19
upstream station in May 2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance Product of
value (n) (SV)(n)
Annelida
Oligochaeta
Naididae sp. w/o hair
8
1.0
3
3.0
Polychaeta
Amphicteis floridus
136
2.0
100
200.0
Arthropoda
Insecta
Coleoptera
Pe/todytes sp.
8
1.4
3
4.2
Diptera
Bezzia/Palpomyia complex
52
2.3
30
69.0
Chironomus decorus
20
1.0
10
10.0
Dicrotendipes nervosus
76
1.0
30
30.0
Parachironomus sp.
4
1.1
3
3.3
Tanypus neopunctipennis
12
1.0
10
10.0
Tanytarsus sp.
160
2.3
100
230.0
Hemiptera
Abedus/Belostoma complex
4
1.0
3
3.0
Malacostraca
Amphipoda
Apocorophium lacustre
4
2.2
3
6.6
Apocorophium sp.
4
2.2
3
6.6
Gammarus tigrinus
112
2.0
100
200.0
Mollusca
Gastropoda
Littoridinops sp.
116
2.0
100
200.0
Total
498
975.7
Estuarine Biotic Index = 1.95
Total taxa = 18
Total taxa with sensitivity values = 13
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.