20080868 Ver 2_I-17 2014 Muddy Sweep Upstream Biotic Index Table_20160708

Table 1-17. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Muddy Creek upstream station in
May 2015.
Species/taxono
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. wio hair
36
1.0
30
30.0
Polychaeta
Amphicteis floridus
220
2.0
100
200.0
Polydora cornuta
2
1.2
1
1.2
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
16
2.3
10
23.0
Chironomus decorus
240
1.0
100
100.0
Cricotopus sp.
4
1.4
3
4.2
Dicrotendipes nervosus
8
1.0
3
3.0
Goeldichironomus devineyae
148
2.0
100
200.0
Parachironomus sp.
18
1.1
10
11.0
Tanytarsus sp.
252
2.3
100
230.0
Hemiptera
Abedus/Belostoma sp.
4
1.0
3
3.0
Corixidae sp.
2
1.3
1
1.3
Odonata
Enallagma sp.
4
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium lacustre
4
2.2
3
6.6
Apocorophium louisianum
64
2.2
30
66.0
Apocorophium sp.
252
2.2
100
220.0
Gammarus mucronatus
4
2.3
3
6.9
Gammarus tigrinus
162
2.0
100
200.0
Orchestia uhleri
2
2.0
1
2.0
Decapoda
Palaemonetes pugio
42
2.5
30
75.0
Rhithropanopeus harrisii
4
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
14
2.0
10
20.0
Mollusca
Gastropoda
Littoridinops sp.
300
2.0
100
200.0
Total
844
1,615.2
Estuarine Biotic Index = 1.91
Total taxa = 31
Total taxa with sensitivitv values = 23
80nly 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.
1-23