20080868 Ver 2_I-9 2014 Drinkwater Sweep Upstream Biotic Index Table_20150717

Table 1 -9. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Drinkwater Creek upstream 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
Tubificidae sp. w/ hair
1
1.0
1
1.0
Tubificidae sp. w/o hair
38
1.0
30
30.0
Polychaeta
Amphicteis floridus
43
2.0
30
60.0
Laeonereis culveri
50
1.0
30
30.0
Arthropoda
I nsecta
Coleoptera
Peltodytes sp.
9
1.4
3
4.2
Diptera
Bezzia/Palpomyia complex
18
2.3
10
23.0
Chironomus decorus
244
1.0
100
100.0
Goeldichironomus devineyae
223
2.0
100
200.0
Parachironomus sp.
4
1.1
3
3.3
Procladius sp.
3
1.2
3
3.6
Pseudochironomus sp.
4
3.7
3
11.1
Tanytarsus sp.
10
2.3
10
23.0
Hemiptera
Abedus/Belostoma sp.
2
1.0
1
1.0
Corixidae sp.
1
1.3
1
1.3
Odonata
Enallagma sp.
3
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium louisianum
16
2.2
10
22.0
Apocorophium sp.
131
2.2
100
220.0
Gammarus tigrinus
22
2.0
10
20.0
Decapoda
Palaemonetes pugio
1
2.5
1
2.5
Isopoda
Cassidinidea lunifrons
7
2.0
3
6.0
Cyathura polita
5
2.0
3
6.0
Tanaidacea
Hargeria rapax
4
1.6
3
4.8
Mollusca
Gastropoda
Littoridinops tenuipes
300
2.0
100
200.0
Total
558
977.3
Estuarine Biotic Index = 1.75
Total taxa = 27
Total taxa with sensitivity values = 23
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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