20080868 Ver 2_I-7 2014 PA2 Sweep Upstream Biotic Index Table_20150717

Table 1 -7. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the PA2 Creek upstream station in May
2014.
am
Number of
Sensitivity
Abundance
Product of
Species /taxona
individuals"
value (SV)°
value (n)
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
63
1.0
30.0
30.0
Polychaeta
Amphicteis floridus
17
2.0
10
20.0
Eteone heteropoda
2
1.6
1
1.6
Polydora cornuta
1
1.2
1
1.2
Arthropoda
Insecta
Coleoptera
Enochrus sp.
3
1.3
3
3.9
Peltodytes sp.
1
1.4
1
1.4
Diptera
Bezzia/Palpomyia complex
31
2.3
30
69.0
Chironomus decorus
153
1.0
100
100.0
Cricotopus sp.
1
1.4
1
1.4
Goeldichironomus devineyae
204
2.0
100
200.0
Parachironomus sp.
1
1.1
1
1.1
Procladius sp.
2
1.2
1
1.2
Tanypus neopunctipennis
3
1.0
3
3.0
Hemiptera
Abedus/Belostoma sp.
8
1.0
3
3.0
Odonata
Enallagma sp.
12
1.5
10
15.0
Ischnura sp.
6
1.0
3
3.0
Malacostraca
Amphipoda
Apocorophium louisianum
20
2.2
10
22.0
Apocorophium sp.
88
2.2
30
66.0
Gammarus mucronatus
4
2.3
3
6.9
Gammarus tigrinus
10
2.0
10
20.0
Isopoda
Cassidinidea lunifrons
14
2.0
10
20.0
Tanaidacea
Hargeria rapax
4
1.6
3
4.8
Mollusca
Gastropoda
Littoridinops tenuipes
300
2.0
100
200.0
Total
464
794.5
Estuarine Biotic Index = 1.71
Total taxa = 27
Total taxa with sensitivity values = 23
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.
am