20080868 Ver 2_I-26 2014 DCUT19 Sweep Downstream Biotic Index Table_20150717

Table 1 -26. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the DCUT19 downstream station in May
of 2014.
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Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)°
value (n)
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
9
1.0
3
3.0
Polychaeta
Amphicteis floridus
137
2.0
100
200.0
Eteone heteropoda
6
1.6
3
4.8
Marenzellaria vindis
7
2.6
3
7.8
Polydora cornuta
10
1.2
10
12.0
Streblospia benediciti
3
1.1
3
3.3
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
33
2.3
30
69.0
Chironomus decorus
180
1.0
100
100.0
Dicrotendipes nervosus
6
1.0
3
3.0
Goeldichironomus devineyae
215
2.0
100
200.0
Parachironomus sp.
3
1.1
3
3.3
Tanypus neopunctipennis
6
1.0
3
3.0
Tanytarsus sp.
159
2.3
100
230.0
Hemiptera
Abedus/Belostoma sp.
1
1.0
1
1.0
Trichocorixa sexcinta
1
1.0
1
1.0
Malacostraca
Amphipoda
Apocorophium lacustre
7
2.2
3
6.6
Apocorophium louisianum
164
2.2
100
220.0
Apocorophium sp.
215
2.2
100
220.0
Gammarus mucronatus
192
2.3
100
230.0
Gammarus tigrinus
210
2.0
100
200.0
Decapoda
Palaemonetes pugio
49
2.5
30
75.0
Rhithropanopeus harrisii
3
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
3
2.0
3
6.0
Cyathura polita
10
2.0
10
20.0
Edotia montosa
21
2.6
10
26.0
Tanaidacea
Hargeria rapax
287
1.6
100
160.0
Mollusca
Bivalvia
Macoma balthica
3
1.5
3
4.5
Gastropoda
Littoridinops tenuipes
300
2.0
100
200.0
Total
1,125
2,216.8
Estuarine Biotic Index = 1.97
Total taxa = 34
Total taxa with sensitivity values = 28
aOnly those taxa for which a sensitivity value is available are displayed.
TTotal number of individuals caught in all three sweep replicates.
Sensitivity values provided by NCDWR.
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