20080868 Ver 2_I-5 2015 Jacobs Sweep Upstream Biotic Index Table_20160708

Table 1-5. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Jacobs Creek upstream station in
May 2015.
Species/taxono
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligohaeta
Tubificidae sp. w/o hair
4
1.0
3
3.0
Polychaeta
Amphicteis floridus
118
2.0
100
200.0
Streblospio benedicti
2
1.0
1
1.0
Arthropoda
Insecta
Coleoptera
Berosus sp.
2
1.5
1
1.5
Peltodytes sp.
56
1.4
30
42.0
Diptera
BezzialPalmonyia complex
16
2.3
10
23.0
Chironomus decorus
300
1.0
100
100.0
Cricotopus sp.
2
1.4
1
1.4
Dicrotendipes nervosus
42
1.0
30
30.0
Goeldichironomus devineyae
62
2.0
30
60.0
Parachironomus sp.
12
1.1
10
11.0
Procladius sp.
4
1.2
3
3.6
Tanytarsus sp.
236
2.3
100
230.0
Hemiptera
Abedus/Belostoma sp.
4
1.0
3
3.0
Trichocorixa sexcinta
2
1.0
1
1.0
Odonata
Enallagma sp.
16
1.5
10
15.0
Malacostraca
Amphipoda
Apocorophium louisianum
40
2.2
30
66.0
Apocorophium sp.
198
2.2
100
220.0
Gammarus tigrinus
202
2.0
100
200.0
Mollusca
Bivalvia
Mytilopsis leucophaeata
2
1.5
1
1.5
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
764
1,413.0
Estuarine Biotic Index = 1.85
Total taxa = 26
Total taxa with sensitivitv values = 20
20nly 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.
BE