20080868 Ver 2_I-64 2017 Huddles Ponar Upstream Biotic Index Table_20180629

Table 1-64. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Huddles Cut
upstream station in May 2017.
Species/taxon'
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value (n)
Product of
SV)(n)
Annelida
Oligochaeta
Tubificoides heterochaetus
9
1.1
3
3.3
Polychaeta
Amphicteis floridus
7
2.0
3
6.0
Heteromastus filiformis
1
1.1
1
1.1
Laeoneris culveri
24
1.0
10
10.0
Mediomastus ambiseta
1
2.0
1
2.0
Streblospio benedicti
1
1.1
1
1.1
Arthropoda
Insecta
Coleoptera sp.
Berosus sp.
4
1.5
3
4.5
Diptera
Bezzia/Palpomyia complex
10
2.3
10
23.0
Chironomus decorus
39
1.0
30
30.0
Tanypus neopunctipennis
5
1.0
3
3.0
Tanytarsus sp.
5
2.3
3
6.9
Malacostraca
Amphipoda
Apocorophium sp.
8
2.2
3
6.6
Gammarus tigrinus
1
2.0
1
2.0
Uhlorchestia uhleri
1
2.0
1
2.0
Decapoda
Pa/aemonetes pugio
2
2.5
1
2.5
Isopoda
Edotia montosa
2
2.6
1
2.6
Mollusca
Bivalvia
Macoma tenta
19
2.0
10
20.0
Rangia cuneata
5
1.0
3
3.0
Gastropoda
Littoridinops sp.
7
2.0
3
6.0
Total
91
135.6
Estuarine Biotic Index = 1.49
Total taxa = 21
Total taxa with sensitivitv values = 19
' 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.
1-70