20080868 Ver 2_I-24 2014 Duck Sweep Downstream Biotic Index Table_20150717

Table 1 -24. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Duck Creek downstream station in
May 2014.
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Number of
Sensitivity
Abundance
Product of
Species /taxona
individuals"
value (SV)°
value (n)
(SV)(n)
Annelida
Oligochaeta
Peloscolex heterochaetus
2
1.1
1
1.1
Tubificidae sp. w/o hair
21
1.0
10
10.0
Polychaeta
Amphicteis floridus
132
2.0
100
200.0
Marenzellaria viridis
25
2.6
10
26.0
Polydora cornuta
23
1.2
10
12.0
Streblospio benedicti
2
1.1
1
1.1
Arthropoda
I nsecta
Diptera
Bezzia/Palmonyia complex
2
2.3
1
2.3
Chironomus decorus
139
1.0
100
100.0
Dicrotendipes nervosus
9
1.0
3
3.0
Goeldichironomus devineyae
205
2.0
100
200.0
Parachironomus sp.
2
1.1
1
1.1
Tanytarsus sp.
105
2.3
100
230.0
Hemiptera
Abedus/Belostoma sp.
2
1.0
1
1.0
Malacostraca
Amphipoda
Apocorophium lacustre
149
2.2
100
220.0
Apocorophium sp.
290
2.2
100
220.0
Gammarus mucronatus
1
2.3
1
2.3
Gammarus tigrinus
300
2.0
100
200.0
Decapoda
Palaemonetes pugio
142
2.5
100
250.0
Rhithropanopeus harrisii
1
2.5
1
2.5
Isopoda
Cyathura polita
38
2.0
30
60.0
Edotia montosa
11
2.6
10
26.0
Mysida
Americamysis almyra
5
2.2
3
6.6
Tanaidacea
Hargeria rapax
300
1.6
100
160.0
Mollusca
Bivalvia
Macoma balthica
1
1.5
1
1.5
Gastropoda
Littoridinops tenuipes
227
2.0
100
200.0
Total
1084
2,136.5
Estuarine Biotic Index = 1.97
Total taxa = 27
Total taxa with sensitivity values = 25
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.
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