20080868 Ver 2_I-68 2017 Porter Ponar Upstream Biotic Index Table_20180629

Table 1-68. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Porter 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
12
1.0
10
10.0
Polychaeta
Amphicteis floridus
500
2.0
100
200.0
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
16
2.3
10
23.0
Chironomus decorus
10
1.0
10
10.0
Dicrotendipes nervosus
2
1.0
1
1.0
Glyptotendipes sp.
20
1.3
10
13.0
Procladius sp.
9
1.2
3
3.6
Tanypus neopunctipennis
9
1.0
3
3.0
Tanytarsus sp.
6
2.3
3
6.9
Malacostraca
Amphipoda
Gammarus tigrinus
317
2.0
100
200.0
Isopoda
Cassidinidea lunifrons
2
2.0
1
2.0
Mysida
Americamysis almyra
7
2.2
3
6.6
Mollusca
Bivalvia
Mytilopsis leucophaeata
12
1.5
10
15.0
Gastropoda
Littoridinops sp.
149
2.0
100
200.0
Total
364
694.1
Estuarine Biotic Index = 1.91
Total taxa = 18
Total taxa with sensitivity values = 14
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.