20080868 Ver 2_I-7 2017 PA2 Sweep Upstream Biotic Index Table_20180629

Table 1-7. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the PA2 Creek upstream station in May
2017.
Species/taxon'
Number of
individualsb
Sensitivity
value (SV)c
Abundance Product of
value (n) (SV)(n
Annelida
Oligochaeta
Enchytraeidae sp.
8
1.0
3
3.0
Naididae sp. w/o hair
15
1.0
10
10.0
Polychaeta
Amphicteis floridus
75
2.0
30
60.0
Laeonereis culveri
4
1.0
3
3.0
Marenzelleria viridis
3
2.6
3
7.8
Polydora cornuta
3
1.2
3
3.6
Arthropoda
Insecta
Coleoptera
Berosus sp.
12
1.5
10
15.0
Diptera
Apedilum sp.
7
4.0
3
12.0
Bezzia/Palpomyia complex
3
2.3
3
6.9
Chironomus decorus
4
1.0
3
3.0
Dicrotendipes nervosus
7
1.0
3
3.0
Goeldichironomus devineyae
36
2.0
30
60.0
Tanytarsus sp.
11
2.3
10
23.0
Hemiptera
Abedus/Belostoma complex
3
1.0
3
3.0
Corixidae sp.
300
1.3
100
130.0
Trichocorixa sexcinta
174
1.0
100
100.0
Odonata
Enallagma sp.
7
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium lacustre
69
2.2
30
66.0
Apocorophium louisianum
108
2.2
100
220.0
Apocorophium sp.
230
2.2
100
220.0
Gammarus tigrinus
226
2.0
100
200.0
Isopoda
Cassidinidea lunifrons
32
2.0
30
60.0
Mysida
Americamysis almyra
2
2.2
1
2.2
Mollusca
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
781
1,416.0
Estuarine Biotic Index = 1.81
Total taxa = 26
Total taxa with sensitivitv values = 22
'Only those taxa for which a sensitivity value is available are displayed
b Total number of individuals caught in all three sweep replicates.
°Sensitivity values provided by NCDWR.