20080868 Ver 2_I-22 2014 Porter Sweep Downstream Biotic Index Table_20150717

Table 1 -22. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Porter Creek downstream station in
May of 2014.
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Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)`
value (n)
(SV)(n)
Annelida
Oligochaeta
Peloscolex heterochaetus
1
1.1
1
1.1
Tubificidae sp. w/o hair
2
1.0
1
1.0
Polychaeta
Amphicteis floridus
8
2.0
3
6.0
Marenzelleria viridis
6
2.6
3
7.8
Neanthes succinea
1
1.7
1
1.7
Polydora cornuta
57
1.2
30
36.0
Streblospia benediciti
1
1.1
1
1.1
Arthropoda
Insecta
Diptera
Chironomus decorus
5
1.0
3
3.0
Dicrotendipes nervosus
4
1.0
3
3.0
Goeldichironomus devineyae
26
2.0
10
20.0
Parachironomus sp.
11
1.1
10
11.0
Tanytarsus sp.
10
2.3
10
23.0
Malacostraca
Amphipoda
Apocorophium lacustre
156
2.2
100
220.0
Apocorophium louisianum
8
2.2
3
6.6
Apocorophium sp.
300
2.2
100
220.0
Gammarus mucronatus
228
2.3
100
230.0
Gammarus tigrinus
188
2.0
100
200.0
Decapoda
Palaemonetes pugio
19
2.5
10
25.0
Rhithropanopeus harrisii
10
2.5
10
25.0
Isopoda
Cassidinidea lunifrons
13
2.0
10
20.0
Cyathura polita
12
2.0
10
20.0
Edotia montosa
5
2.6
3
7.8
Mysida
Americamysis almyra
3
2.2
3
6.6
Tanaidacea
Hargeria rapax
254
1.6
100
160.0
Maxillopoda
Sessilia
Balanus improvisus
4
2.0
3
6.0
Mollusca
Gastropoda
Littoridinops tenuipes
220
2.0
100
200.0
Total
728
1,461.7
Estuarine Biotic Index = 2.01
Total taxa = 30
Total taxa with sensitivity values = 27
aOnly those taxa for which a sensitivity value is available
are displayed.
TTotal number of individuals caught in all three sweep replicates.
Sensitivity values provided by NCDWR.
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