20080868 Ver 2_I-76 2014 DCUT19 Ponar Upstream Biotic Index Table_20150717

Table 1 -76. Estuarine Biotic Index (EBI)
calculations for benthic ponar samples at the DCUT19
upstream 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
47
1.0
30
30.0
Polychaeta
Amphicteis f/oridus
25
2.0
10
20.0
Laeonereis culveri
9
1.0
3
3.0
Arthropoda
I nsecta
Diptera
Bezzia/Palpomyia complex
55
2.3
30
69.0
Chironomus decorus
157
1.0
100
100.0
Dicrotendipes nervosus
3
1.0
3
3.0
Goe/dichironomus devineyae
14
2.0
10
20.0
Parachironomus sp.
25
1.1
10
11.0
Tanypus neopunctipennis
26
1.0
10
10.0
Tanytarsus sp.
185
2.3
100
230.0
Malacostraca
Amphipoda
Apocorophium sp.
7
2.2
3
6.6
Decapoda
Palaemonetes pugio
12
2.5
10
25.0
Tanaidacea
Hargeria rapax
11
1.6
10
16.0
Mollusca
Gastropoda
Littoridinops tenuipes
497
2.0
100
200.0
Total
429
743.6
Estuarine Biotic Index = 1.73
Total taxa = 17
Total taxa with sensitivity values = 14
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.