20080868 Ver 2_I-24 2015 Duck Sweep Downstream Biotic Index Table_20160708

Table 1-24. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Duck Creek downstream station in
May 2014.
Species/taxono
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. wio hair
3
1.0
3
3.0
Tubificoides heterochaetus
5
1.1
3
3.3
Polychaeta
Amphicteis floridus
48
2.0
30
60.0
Laeonereis culveri
5
1.0
3
3.0
Marenzellaria viddis
7
2.6
3
7.8
Arthropoda
Insecta
Diptera
Bezzia/Palmonyia complex
1
2.3
1
2.3
Chironomus decorus
7
1.0
3
3.0
Dicrotendipes nervosus
75
1.0
30
30.0
Goeldichironomus devineyae
2
2.0
1
2.0
Nanocladius sp.
2
2.0
1
2.0
Polypedilum sp.
12
1.5
10
15.0
Tanytarsus sp.
22
2.3
10
23.0
Malacostraca
Amphipoda
Apocorophium lacustre
13
2.2
10
22.0
Apocorophium sp.
60
2.2
30
66.0
Gammarus tigrinus
290
2.0
100
200.0
Lepidactylus dytiscus
2
3.5
1
3.5
Decapoda
Palaemonetes pugio
40
2.5
30
75.0
Rhithropanopeus harrisii
1
2.5
1
2.5
Isopoda
Cassidinidea lunifrons
10
2.0
10
20.0
Cyathura polita
25
2.0
10
20.0
Edotia montosa
7
2.6
3
7.8
Mysida
Americamysis almyra
14
2.2
10
22.0
Tanaidacea
Hargeria rapax
18
1.6
10
16.0
Mollusca
Gastropoda
Littoridinops sp.
263
2.0
100
200.0
Total
413
809.2
Estuarine Biotic Index = 1.96
Total taxa = 27
Total taxa with sensitivitv values = 22
80nly 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.
1-30