20080868 Ver 2_I-38 2014 Jacobs Ponar Downstream Biotic Index Table_20150717

Table 1 -38. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacobs Creek
downstream station in May 2014.
Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)`
value (n)
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
7
1.0
3
3.0
Polychaeta
Heteromastus filiformis
1
1.1
1
1.1
Mediomastus ambiseta
36
2.0
30
60.0
Scoloplos robustus
2
1.1
1
1.1
Streblospio benedicti
5
1.1
3
3.3
Arthropoda
Insecta
Diptera
Chironomus decorus
129
1.0
100
100.0
Parachironomus sp.
1
1.1
1
1.1
Malacostraca
Amphipoda
Apocorophium louisianum
1
2.2
1
2.2
Gammarus mucronatus
71
2.3
30
69.0
Gammarus tigrinus
2
2.0
1
2.0
Decapoda
Palaemonetes pugio
1
2.5
1
2.5
Mysida
Americamysis almyra
1
2.2
1
2.2
Mollusca
Bivalvia
Macoma balthica
6
1.5
3
4.5
Macoma tenta
26
2.0
10
20.0
Mulinia lateralis
1
2.3
1
2.3
Gastropoda
Littoridinops tenuipes
2
2.0
1
2.0
Total
188
276.3
Estuarine Biotic Index = 1.47
Total taxa = 18
Total taxa with sensitivity values = 16
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.
1 -44