20080868 Ver 2_I-42 2014 PA2 Ponar Downstream Biotic Index Table_20150717

Table 1 -42. Estuarine Biotic Index
(EBI) calculations for
benthic ponar samples
at the PA2
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
64
1.0
30
30.0
Polychaeta
Heteromastus filiformis
1
1.1
1
1.1
Polydora cornuta
1
1.2
1
1.2
Arthropoda
I nsecta
Diptera
Bezzia/Palmonyia complex
1
2.3
1
2.3
Chironomus decorus
30
1.0
30
30.0
Parachironomus sp.
11
1.1
10
11.0
Malacostraca
Amphipoda
Apocorophium louisanum
1
2.2
1
2.2
Apocorophium sp.
5
2.2
3
6.6
Gammarus mucronatus
36
2.3
30
69.0
Tanaidacea
Hargeria rapax
1
1.6
1
1.6
Mollusca
Bivalvia
Macoma tenta
1
2.0
1
2.0
Gastropoda
Littoridinops tenuipes
22
2.0
10
20.0
Total
119
177.0
Estuarine Biotic Index = 1.49
Total taxa = 11
Total taxa with sensitivity values = 12
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 NCDWR.