20080868 Ver 2_I-36 2014 Jacobs Ponar Upstream Biotic Index Table_20150717

Table 1 -36. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Jacobs Creek
upstream station in May 2014.
Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)`
value (n)
(SV)(n)
Annelida
Oligochaeta
Nais sp.
3
1.3
3
3.9
Tubificidae sp. w/o hair
8
1.0
3
3.0
Arthropoda
I nsecta
Diptera
Chironomus decorus
222
1.0
100
100.0
Cricotopus sp.
4
1.4
3
4.2
Goeldichironomus devineyae
15
2.0
10
20.0
Parachironomus sp.
55
1.1
30
33.0
Tanypus neopunctipennis
11
1.0
10
10.0
Tanytarsus sp.
20
2.3
10
23.0
Hemiptera
Corixidae sp.
4
1.3
3
3.9
Malacostraca
Amphipoda
Apocorophium sp.
10
2.2
10
22.0
Gammarus tigrinus
9
2.0
3
6.0
Mollusca
Bivalvia
Macoma tenta
6
2.0
3
6.0
Gastropoda
Littoridinops tenuipes
49
2.0
30
60.0
Total
218
295.0
Estuarine Biotic Index = 1.35
Total taxa = 15
Total taxa with sensitivity values = 13
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 NCDW R.
1 -42