20080868 Ver 2_I-40 2017 PA2 Ponar Upstream Biotic Index Table_20180629

Table 1-40. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the PA2 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
1
1.0 1
1.0
Polychaeta
Amphicteis floridus
141
2.0 100
200.0
Laeonereis culveri
1
1.0 1
1.0
Marenzelleria viridis
1
2.6 1
2.6
Streblospio benedicti
2
1.1 1
1.1
Arthropoda
Insecta
Diptera
Apedilum sp.
14
4.0 10
40.0
Bezzia/Palpomyia complex
2
2.3 1
2.3
Chironomus decorus
2
1.0 1
1.0
Dicrotendipes nervosus
1
1.0 1
1.0
Goeldichironomus devineyae
3
2.0 3
6.0
Tanypus neopunctipennis
2
1.0 1
1.0
Hemiptera
Corixidae sp.
29
1.3 10
13.0
Trichocorixa sexcinta
5
1.0 3
3.0
Odonata
Enallagma sp.
1
1.5 1
1.5
Malacostraca
Amphipoda
Apocorophium sp.
6
2.2 3
6.6
Gammarus tigrinus
13
2.0 10
20.0
Mollusca
Bivalvia
Rangia cuneata
1
1.0 1
1.0
Gastropoda
Littoridinops sp.
167
2.0 100
200.0
Total
249
502.1
Estuarine Biotic Index = 2.02
Total taxa = 19
Total taxa with sensitivity values = 17
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.
.R