20080868 Ver 2_I-10 2014 Drinkwater Sweep Downstream Biotic Index Table_20150717

Table 1 -10. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Drinkwater Creek downstream
station in May 2014.
1 -14
Number of
Sensitivity
Abundance
Product of
Species /taxon'
individuals"
value (TV)`
value (n)
(TV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
4
1.0
3
3.0
Polychaeta
Amphicteis floridus
17
2.0
10
20.0
Eteone heteropoda
4
1.6
3
4.8
Marenzelleria viridis
3
2.6
3
7.8
Polydora cornuta
4
1.2
3
3.6
Arthropoda
Insecta
Diptera
Chironomus decorus
118
1.0
100
100.0
Goeldichironomus devineyae
123
2.0
100
200.0
Parachironomus sp.
1
1.1
1
1.1
Hemiptera
Abedus/Belostoma sp.
1
1.0
1
1.0
Odonata
Libellula sp.
3
1.1
3
3.3
Malacostraca
Amphipoda
Apocorophium lacustre
8
2.2
3
6.6
Apocophorium louisianum
13
2.2
10
22.0
Apocorophium sp.
193
2.2
100
220.0
Gammarus mucronatus
164
2.3
100
230.0
Gammarus tigrinus
145
2.0
100
200.0
Isopoda
Cassidinidea lunifrons
10
2.0
10
20.0
Cyathura polita
8
2.0
3
6.0
Edotia montosa
14
2.6
10
26.0
Tanaidacea
Hargeria rapax
150
1.6
100
160.0
Mollusca
Bivalvia
Geukensia demissa
1
3.4
1
3.4
Gastropoda
Littoridinops tenuipes
245
2.0
100
200.0
Total
764
1,438.6
Estuarine Biotic Index = 1.88
Total taxa = 27
Total taxa with sensitivity values = 21
'Only 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 -14