20080868 Ver 2_I-16 2014 Tooley Sweep Downstream Biotic Index Table_20150717

Table I -16. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Tooley Creek downstream station in
May of 2014.
Number of
Sensitivity
Abundance
Product of
Species /taxon'
individualsb
value (SV)`
value (n)
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
1
1.0
1
1.0
Polychaeta
Amphicteis floridus
6
2.0
3
6.0
Eteone heteropoda
10
1.6
10
16.0
Marenzelleria viridis
1
2.6
1
2.6
Polydora cornuta
15
1.2
10
12.0
Streblospio benedicti
2
1.1
1
1.1
Arthropoda
Insecta
Diptera
Chironomus decorus
87
1.0
30
30.0
Dicrotendipes nervosus
1
1.0
1
1.0
Goeldichironomus devineyae
6
2.0
3
6.0
Parachironomus sp.
1
1.1
1
1.1
Tanytarsus sp.
1
2.3
1
2.3
Malacostraca
Amphipoda
Apocorophium lacustre
3
2.2
3
6.6
Apocorophium louisianum
41
2.2
30
66.0
Apocorophium sp.
241
2.2
100
220.0
Gammarus mucronatus
224
2.3
100
230.0
Gammarus tigrinus
20
2.0
10
20.0
Melita nitida
8
2.0
3
6.0
Decapoda
Palaemonetes pugio
58
2.5
30
75.0
Rhithropanopeus harrish
107
2.5
100
250.0
Isopoda
Cassidinidea lunifrons
3
2.0
3
6.0
Cyathura polita
4
2.0
3
6.0
Edotia montosa
18
2.6
10
26.0
Mysida
Americamysis almyra
18
2.2
10
22.0
Odonata
Enallagma sp.
1
1.5
1
1.5
Tanaidacea
Hargeria rapax
228
1.6
100
160.0
Maxillopoda
Balanus improvisus
12
2.0
10
20.0
Mollusca
Bivalvia
Geukensia dimissa
2
3.4
1
3.4
Gastropoda
Littoridinops tenuipes
250
2.0
100
200.0
Total
676
1,397.6
Estuarine Biotic Index = 2.07
Total taxa = 34
Total taxa with sensitivity values = 28
'Only 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.
1 -20