20080868 Ver 2_I-15 2015 Tooley Sweep Upstream Biotic Index Table_20160708

Table 1-15. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Tooley Creek upstream station in
May 2015.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
26
1.0
10
10.0
Polychaeta
Amphicteis floridus
160
2.0
100
200.0
Eteone heteropoda
4
1.6
3
4.8
Laeonereis culveri
200
1.0
100
100.0
Polydora cornuta
12
1.2
10
12.0
Streblospio benedicti
4
1.1
3
3.3
Arthropoda
Insecta
Diptera
Apedilum sp.
4
4.0
3
12.0
Bezzia/Palpomyia complex
8
2.3
3
6.9
Chironomus decorus
220
1.0
100
100.0
Dicrotendipes nervosus
1.0
10
10.0
Goeldichironomus devineyae
92
2.0
30
60.0
Parachironomus sp.
6
1.1
3
3.3
Tanytarsus sp.
300
2.3
100
230.0
Hemiptera
Corixidae sp.
12
1.3
10
13.0
Odonata
Enallagma sp.
6
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium louisianum
84
2.2
30
66.0
Apocorophium sp.
200
2.2
100
220.0
Gammarus mucronatus
22
2.3
10
23.0
Gammarus tigrinus
182
2.0
100
200.0
Decapoda
Palaemonetes pugio
54
2.5
30
75.0
Rhithripanopeus harrisii
8
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
2
2.0
1
2.0
Cyathura polita
40
2.0
30
60.0
Edotia montosa
8
2.6
3
7.8
Tanaidacea
Hargeria rapax
282
1.6
100
160.0
Mollusca
Bivalvia
Mytilopsis leucophaeata
6
1.5
3
4.5
Gastropoda
Littoridinops sp.
236
2.0
100
200.0
Total
998
1,795.6
Estuarine Biotic Index = 1.80
Total taxa = 31
Total taxa with sensitivitv values = 26
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.
1-21