20080868 Ver 2_I-8 2015 PA2 Sweep Downstream Biotic Index Table_20160708

Table 1-8. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the PA2 Creek downstream station in
May 2015.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Enchytraeidae sp.
90
1.0
30
30.0
Tubificidae sp. w/o hair
10
1.0
10
10.0
Polychaeta
Amphicteis floridus
54
2.0
30
60.0
Arthropoda
Insecta
Coleoptera
Peltodytes sp.
18
1.4
10
14.0
Tropisternus sp.
4
1.0
3
3.0
Diptera
Bezzia/Palpomyia complex
12
2.3
10
23.0
Chironomus decorus
112
1.0
100
100.0
Dolichopodidae sp.
2
1.0
1
1.0
Goeldichironomus devineyae
300
2.0
100
200.0
Procladius sp.
4
1.2
3
3.6
Tanypus neopunctipennis
4
1.0
3
3.0
Tanytarsus sp.
14
2.3
10
23.0
Hemiptera
Abedus/Belostoma sp.
8
1.0
3
3.0
Corixidae sp.
12
1.3
10
13.0
Ranatra nigra
2
2.6
1
2.6
Odonata
Enallagma sp.
8
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium lacustre
26
2.2
10
22.0
Apocorophium louisianum
156
2.2
100
220.0
Apocorophium sp.
300
2.2
100
220.0
Gammarus tigrinus
132
2.0
100
200.0
Decapoda
Palaemonetes pugio
2
2.5
1
2.5
Isopoda
Cassidinidea lunifrons
30
2.0
30
60.0
Tanaidacea
Hargeria rapax
4
1.6
3
4.8
Mollusca
Bivalvia
Mytilopsis leucophaeata
8
1.5
3
4.5
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
774
1,427.5
Estuarine Biotic Index = 1.84
Total taxa = 29
Total taxa with sensitivity values = 24
'Only those taxa for which a sensitivity value is available are displayed
bTotal number of individuals caught in all three sweep replicates.
°Sensitivity values provided by NCDWR.
1-14