20080868 Ver 2_I-6 2015 Jacobs Sweep Downstream Biotic Index Table_20160708

Table 1-6. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Jacobs Creek downstream station in
Mav 2015.
Species/taxon'
Number of
individualsb
Sensitivity
value (SV)c
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
4
1.0
3
3.0
Tubificoides heterochaetus
7
1.1
3
3.3
Polychaeta
Amphicteis floridus
84
2.0
30
60.0
Marenzeleria viridis
7
2.6
3
7.8
Polydora cornuta
9
1.2
3
3.6
Streblospio benedicti
1
1.1
1
1.1
Arthropoda
Insecta
Diptera
Bezzia/Palmonyia complex
3
2.3
3
6.9
Chironomus decorus
46
1.0
30
30.0
Cricotopus sp.
6
1.4
3
4.2
Dicrotendipes nervosus
24
1.0
10
10.0
Goeldichironomus devineyae
26
2.0
10
20.0
Parachironomus sp.
15
1.1
10
11.0
Procladius sp.
1
1.2
1
1.2
Tanytarsus sp.
51
2.3
30
69.0
Hemiptera
Abedus/Belostoma sp.
2
1.0
1
1.0
Odonata
Enallagma sp.
4
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium lacustre
49
2.2
30
66.0
Apocorophium louisianum
19
2.2
10
22.0
Apocorophium sp.
300
2.2
100
220.0
Gammarus mucronatus
22
2.3
10
23.0
Gammarus tigrinus
243
2.0
100
200.0
Decapoda
Palaemonetes pugio
18
2.5
10
25.0
Rhithropanopeus harrisii
108
2.5
100
250.0
Isopoda
Cassidinidea lunifrons
27
2.0
10
20.0
Cyathura polita
15
2.0
10
20.0
Edotia montosa
3
2.6
3
7.8
Mysida
Americamysis almyra
3
2.2
3
6.6
Tanaidacea
Hargeria rapax
83
1.6
30
48.0
Maxillopoda
Sessilia
Balanus improvisus
9
2.0
3
6.0
Mollusca
Bivalvia
Mytilopsis leucophaeata
57
1.5
30
45.0
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
693
1,396.0
Estuarine Biotic Index = 2.01
Total taxa = 35
Total taxa with sensitivitv values = 29
'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.
1-12