20080868 Ver 2_I-16 2017 Tooley Sweep Downstream Biotic Index Table_20180629

Table 1-16. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Tooley Creek downstream station
in Mav of 2017.
Species/taxon'
Number of
individualsb
Sensitivity
value (SV)°
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Enchytraeidae sp.
2
1.0
1
1.0
Naididae sp. w/o hair
3
1.0
3
3.0
Paranais sp.
1
1.1
1
1.1
Polychaeta
Amphicteis floridus
12
2.0
10
20.0
Eteone heteropoda
3
1.6
3
4.8
Marenzelleria vindis
1
2.6
1
2.6
Mediomastus ambiseta
1
2.0
1
2.0
Streblospio benedicti
3
1.1
3
3.3
Arthropoda
Insecta
Diptera
Chironomus decorus
36
1.0
30
30.0
Dicrotendipes nervosus
11
1.0
10
10.0
Goeldichironomus devineyae
15
2.0
10
20.0
Parachironomus sp.
32
1.1
30
33.0
Tanytarsus sp.
14
2.3
10
23.0
Hemiptera
Corixidae sp.
3
1.3
3
3.9
Pelocoris femoratus
3
2.3
3
6.9
Trichocorixa sexcinta
3
1.0
3
3.0
Ephemeroptera
Callibaetis sp.
2
1.1
1
1.1
Malacostraca
Amphipoda
Apocorophium lacustre
115
2.2
100
220.0
Apocorophium louisianum
89
2.2
30
66.0
Apocorophium sp.
229
2.2
100
220.0
Gammarus mucronatus
34
2.3
30
69.0
Gammarus tigrinus
267
2.0
100
200.0
Decapoda
Palaemonetes pugio
49
2.5
30
75.0
Rhithropanopeus harrisii
3
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
22
2.0
10
20.0
Cyathura polita
9
2.0
3
6.0
Edotia montosa
6
2.6
3
7.8
Tanaidacea
Hargeria rapax
28
1.6
10
16.0
Maxillopoda
Sessi/ia
Balanus improvisus
4
2.0
3
6.0
Mollusca
Bivalvia
Geukensia demissa
1
3.4
1
3.4
Mytilopsis leucophaeata
3
1.5
3
4.5
Rangia cuneata
3
1.0
3
3.0
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
1
652
1,292.9
Estuarine Biotic Index = 1.98
Total taxa = 31
Total taxa with sensitivity values = 30
'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.
1-20