20080868 Ver 2_I-13 2015 Long Sweeps Upstream Biotic Index Table_20160708

Table 1-13. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Long 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. wio hair
11
1.0
10
10.0
Polychaeta
Amphicteis floridus
224
2.0
100
200.0
Eteone heteropoda
4
1.6
3
4.8
Heteromastus filliformis
4
1.1
3
3.3
Laeonereis culveri
28
1.0
10
10.0
Polydora cornuta
3
1.2
3
3.6
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
51
2.3
30
69.0
Chironomus decorus
300
1.0
100
100.0
Cricotopus sp.
30
1.4
30
42.0
Dicrotendipes nervosus
20
1.0
10
10.0
Goeldichironomus devineyae
107
2.0
100
200.0
Parachironomus sp.
11
1.1
10
11.0
Tanytarsus sp.
300
2.3
100
230.0
Ephemeroptera
Callibaetis sp.
6
1.1
3
3.3
Hemiptera
Corixidae sp.
50
1.3
30
39.0
Odonata
Enallagma sp.
23
1.5
10
15.0
Malacostraca
Amphipoda
Apocorophium lacustre
3
2.2
3
6.6
Apocorophium louisianum
47
2.2
30
66.0
Apocorophium sp.
287
2.2
100
220.0
Gammarus mucronatus
23
2.3
10
23.0
Gammarus tigrinus
156
2.0
100
200.0
Isopoda
Cassidinidea lunifrons
4
2.0
3
6.0
Mysida
Americamysis almyra
3
2.2
3
6.6
Tanaidacea
Hargeria rapax
72
1.6
30
48.0
Mollusca
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
931
1,727.2
Estuarine Biotic Index = 1.86
Total taxa = 31
Total taxa with sensitivitv values = 23
aOnly 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.