20080868 Ver 2_I-15 2017 Tooley Sweep Upstream Biotic Index Table_20180629

Table 1-15. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Tooley Creek upstream station in
May 2017.
Species/taxon
Number of
individual Sb
Sensitivity
value (SV)c
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Enchyraeidae sp.
12
1.0
10
10.0
Limnodrilus hoffineisteri
4
1.0
3
3.0
Naididae sp. w/o hair
4
1.0
3
3.0
Polychaeta
Amphicteis floridus
184
2.0
100
200.0
Eteone heteropoda
12
1.6
10
16.0
Laeonereis culveri
8
1.0
3
3.0
Marenzelleria vindis
8
2.6
3
7.8
Polydora cornuta
16
1.2
10
12.0
Arthropoda
Insecta
Coleoptera
Berosus sp.
8
1.5
3
4.5
Peltodytes sp.
8
1.4
3
4.2
Diptera
Bezzia/Palpomyia complex
52
2.3
30
69.0
Chironomus decorus
72
1.0
30
30.0
Dicrotendipes nervosus
44
1.0
30
30.0
Goeldichironomus devineyae
36
2.0
30
60.0
Tanypus neopunctipennis
4
1.0
3
3.0
Tanytarsus sp.
116
2.3
100
230.0
Hemiptera
Abedus/Belostoma complex
4
1.0
3
3.0
Corixidae sp.
120
1.3
100
130.0
Pelocoris femoratus
4
2.3
3
6.9
Trichocorixa sexcintca
112
1.0
100
100.0
Odonata
Enallagma sp.
20
1.5
10
15.0
Malacostraca
Amphipoda
Apocorophium lacustre
164
2.2
100
220.0
Apocorophium louisianum
132
2.2
100
220.0
Apocorophium sp.
300
2.2
100
220.0
Gammarus mucronatus
4
2.3
3
6.9
Gammarus tigrinus
300
2.0
100
200.0
Decapoda
Palaemonetes pugio
28
2.5
10
25.0
Rhithropanopeus harrisii
4
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
24
2.0
10
20.0
Cyathura polita
40
2.0
30
60.0
Edotia montosa
4
2.6
3
7.8
Tanaidacea
Hargeria rapax
80
1.6
30
48.0
Mollusca
Bivalvia
Mytilopsis /eucophaeata
4
1.5
3
4.5
Rangia cuneata
8
1.0
3
3.0
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
1182
2,183.1
Estuarine Biotic Index = 1.85
Total taxa = 36
Total taxa with sensitivity values = 31
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.
1-19