20080868 Ver 2_I-7 2015 PA2 Sweep Upstream Biotic Index Table_20160708

Table 1-7. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the PA2 Creek upstream station in May
2015.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
75
1.0
30
30.0
Polychaeta
Amphicteis floridus
200
2.0
100
200.0
Polydora cornuta
2
1.2
1
1.2
Arthropoda
Insecta
Coleoptera
Berosus sp.
9
1.5
3
4.5
Peltodytes sp.
18
1.4
10
14.0
Diptera
Bezzia/Palpomyia complex
25
2.3
10
23.0
Chironomus decorus
176
1.0
100
100.0
Dicrotendipes nervosus
6
1.0
3
3.0
Dolichopodidae sp.
2
1.0
1
1.0
Goeldichironomus devineyae
215
2.0
100
200.0
Tanypus neopunctipennis
63
1.0
30
30.0
Tanytarsus sp.
54
2.3
30
69.0
Hemiptera
Abedus/Belostoma sp.
6
1.0
3
3.0
Corixidae sp.
2
1.3
1
1.3
Trichocorixa sexcinta
2
1.0
1
1.0
Odonata
Enallagma sp.
10
1.5
10
15.0
Plathemis lydia
2
1.0
1
1.0
Malacostraca
Amphipoda
Apocorophium louisianum
41
2.2
30
66.0
Apocorophium sp.
244
2.2
100
220.0
Gammarus tigrinus
258
2.0
100
200.0
Isopoda
Cassidinidea lunifrons
28
2.0
10
20.0
Tanaidacea
Hargeria rapax
2
1.6
1
1.6
Mollusca
Bivalvia
Mytilopsis leucophaeata
2
1.5
1
1.5
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
776
1,406.1
Estuarine Biotic Index = 1.81
Total taxa = 30
Total taxa with sensitivitv values = 22
aOnly those taxa for which a sensitivity value is available are displayed
b Total number of individuals caught in all three sweep replicates.
°Sensitivity values provided by NCDWR.
1-13