20080868 Ver 2_I-23 2015 Duck Sweep Upstream Biotic Index Table_20160708

Table 1-23. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Duck 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
124
1.0
100
100.0
Polychaeta
Amphicteis floridus
22
2.0
10
20.0
Laeonereis culveri
2
1.0
1
1.0
Arthropoda
Insecta
Coleoptera
Berosus sp.
58
1.5
30
45.0
Diptera
Bezzia/Palpomyia complex
42
2.3
30
69.0
Chironomus decorus
100
1.0
100
100.0
Dicrotendipes nervosus
300
1.0
100
100.0
Dolichopodidae sp.
6
1.0
3
3.0
Tanypus neopunctipennis
4
1.0
3
3.0
Tanytarsus sp.
300
2.3
100
230.0
Hemiptera
Abedus/Belostoma sp.
2
1.0
1
1.0
Corixidae sp.
6
1.3
3
3.9
Malacostraca
Amphipoda
Apocorophium sp.
4
2.2
3
6.6
Gammarus tigrinus
300
2.0
100
200.0
Isopoda
Cassidindea lunifrons
14
2.0
10
20.0
Mollusca
Bivalvia
Mytilopsis leucophaeta
2
1.5
1
1.5
Gastropoda
Littoridinops sp.
204
2.0
100
200.0
Physidae sp. (physa/physella)
2
1.4
1
1.4
Total
696
1,105.4
Estuarine Biotic Index = 1.59
Total taxa = 26
Total taxa with sensitivitv values = 18
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.
1-29