20080868 Ver 2_I-24 2017 Duck Sweep Downstream Biotic Index Table_20180629

Table 1-24. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Duck Creek downstream station in
May 2017.
Species/taxon a
Number of
individualsb
Sensitivity
value SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Naididae sp. w/o hair
6
1.0
3
3.0
Polychaeta
Amphicteis floridus
38
2.0
30
60.0
Arthropoda
Insecta
Diptera
Chironomus decorus
1
1.0
1
1.0
Dicrotendipes nervosus
17
1.0
10
10.0
Goeldichironomus devineyae
6
2.0
3
6.0
Polypedilum sp.
3
1.5
3
4.5
Procladius sp.
1
1.2
1
1.2
Tanytarsus sp.
1
2.3
1
2.3
Odonata
Enallagma sp.
6
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium lacustre
237
2.2
100
220.0
Apocorophium sp.
300
2.2
100
220.0
Gammarus tigrinus
300
2.0
100
200.0
Decapoda
Palaemonetes pugio
75
2.5
30
75.0
Rhithropanopeus harrisii
1
2.5
1
2.5
Isopoda
Cassidinidea lunifrons
19
2.0
10
20.0
Cyathura polita
7
2.0
3
6.0
Mysida
Americamysis almyra
5
2.2
3
6.6
Maxillopoda
Sessilia
Balanus subalbidus
6
2.0
3
6.0
Mollusca
Bivalvia
Mytilopsis leucophaeata
1
1.5
1
1.5
Gastropoda
Littoridinops sp.
261
2.0
100
200.0
Total
506
1,050.1
Estuarine Biotic Index = 2.08
Total taxa = 23
Total taxa with sensitivitv values = 19
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.
1-28