20080868 Ver 2_I-64 2015 Huddles Ponar Upstream Biotic Index Table_20160708

Table 1-64. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Huddles Cut
upstream station in May 2015.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
4
1.0
3
3.0
Tubificoides heterochaetus
4
1.1
3
3.3
Polychaeta
Amphicteis f/oridus
12
2.0
10
20.0
Heteromastus filiformis
6
1.1
3
3.3
Laeonereis culvert
9
1.0
3
3.0
Polydora cornuta
1
1.2
1
1.2
Arthropoda
Insecta
Diptera
Beezia/Palpomyia complex
9
2.3
3
6.9
Chironomus decorus
1
1.0
1
1.0
Parachironomus sp.
1
1.1
1
1.1
Tanypus neopunctipennis
1
1.0
1
1.0
Tanytarsus sp.
19
2.3
10
23.0
Malacostraca
Amphipoda
Apocorophium sp.
3
2.2
3
6.6
Orchestia uhleri
1
2.0
1
2.0
Decapoda
Palaemonetes pugio
3
2.5
3
7.5
Mollusca
Bivalvia
Macoma tenta
11
2.0
10
20.0
Gastropoda
Littoridinops sp.
4
2.0
3
6.0
Total
59
108.9
Estuarine Biotic Index = 1.85
Total taxa = 17
Total taxa with sensitivity values = 15
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 NCDW R.
1-72