20080868 Ver 2_I-17 2014 Muddy Sweep Upstream Biotic Index Table_20150717

Table 1 -17. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Muddy Creek upstream station in
May 2014.
1 -21
Number of
Sensitivity
Abundance
Product of
Species /taxona
individuals"
value (SV)°
value (n)
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
5
1.0
3
3.0
Polychaeta
Amphicteis floridus
14
2.0
10
20.0
Eteone heteropoda
3
1.6
3
4.8
Laeonereis culveri
14
1.0
10
10.0
Polydora cornuta
48
1.2
30
36.0
Arthropoda
I nsecta
Coleoptera
Tropisternus sp.
4
1.0
3
3.0
Diptera
Chironomus decorus
224
1.0
100
100.0
Cricotopus sp.
5
1.4
3
4.2
Goeldichironomus devineyae
205
2.0
100
200.0
Parachironomus sp.
132
1.1
100
110.0
Tanytarsus sp.
5
2.3
3
6.9
Ephemeroptera
Baetis sp.
3
2.5
3
7.5
Hemiptera
Corixidae sp.
15
1.3
10
13.0
Trichocoxia sexcinta
4
1.0
3
3.0
Malacostraca
Amphipoda
Apocorophium louisianum
56
2.2
30
66.0
Apocorophium sp.
168
2.2
100
220.0
Gammarus mucronatus
3
2.3
3
6.9
Gammarus tigrinus
124
2.0
100
200.0
Decapoda
Palaemonetes pugio
18
2.5
10
25.0
Rhithropanopeus harrisii
6
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
4
2.0
3
6.0
Cyathura polita
3
2.0
3
6.0
Mysida
Americamysis almyra
2
2.2
1
2.2
Mollusca
Gastropoda
Littoridinops tenuipes
272
2.0
100
200.0
Total
734
1,261.0
Estuarine Biotic Index = 1.72
Total taxa = 29
Total taxa with sensitivity values = 24
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 -21