20080868 Ver 2_I-23 2014 Duck Sweep Upstream Biotic Index Table_20150717

Table 1 -23. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Duck Creek upstream station in May
2014.
Number of
Sensitivity
Abundance
Product of
Species /taxona
individuals"
value (SV)°
value (n)
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
43
1.0
30
30.0
Polychaeta
Amphicteis floridus
116
2.0
100
200.0
Laeonereis culveri
2
1.0
1
1.0
Arthropoda
Insecta
Coleoptera
Berosus sp.
10
1.5
10
15.0
Diptera
Bezzia/Palpomyia complex
1
2.3
1
2.3
Chironomus decorus
300
1.0
100
100.0
Dicrotendipes nervosus
109
1.0
100
100.0
Goeldichironomus devineyae
3
2.0
3
6.0
Parachironomus sp.
9
1.1
3
3.3
Tanytarsus sp.
203
2.3
100
230.0
Hemiptera
Abedus/Belostoma sp.
8
1.0
3
3.0
Malacostraca
Amphipoda
Apocorophium lacustre
5
2.2
3
6.6
Apocorophium louisianum
4
2.2
3
6.6
Apocorophium sp.
7
2.2
3
6.6
Gammarus tigrinus
300
2.0
100
200.0
Decapoda
Palaemonetes pugio
4
2.5
3
7.5
Isopoda
Cassidindea lunifrons
3
2.0
3
6.0
Mollusca
Bivalvia
Mytilopsis leucophaeta
2
1.5
1
1.5
Gastropoda
Littoridinops tenuipes
300
2.0
100
200.0
Total
667
1,125.4
Estuarine Biotic Index = 1.69
Total taxa = 20
Total taxa with sensitivity values = 19
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.
1 -27