20080868 Ver 2_I-20 2015 Huddles Sweep Downstream Biotic Index Table_20160708

Table 1-20. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Huddles Cut downstream station in
May 2015.
Species/taxon"
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
4
1.0
3
3.0
Polychaeta
Marenzelleria viridis
1
2.6
1
2.6
Polydora cornuta
1
1.2
1
1.2
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
1
2.3
1
2.3
Cricotopus sp.
2
1.4
1
1.4
Cryptochironomus sp.
2
1.0
1
1.0
Dicrotendipes nervosus
2
1.0
1
1.0
Malacostraca
Amphipoda
Ameroculodes complex
1
2.6
1
2.6
Apocorophium lacustre
44
2.2
30
66.0
Apocorophium louisianum
8
2.2
3
6.6
Apocorophium sp.
31
2.2
30
66.0
Gammarus mucronatus
21
2.3
10
23.0
Gammarus tigrinus
206
2.0
100
200.0
Decapoda
Palaemonetes pugio
48
2.5
30
75.0
Isopoda
Cassidinidea lunifrons
3
2.0
3
6.0
Edotia montosa
3
2.6
3
7.8
Tanaidacea
Hargeria rapax
2
1.6
1
1.6
Mollusca
Gastropoda
Littoridinops sp.
63
2.0
30
60.0
Physidae sp. (physa/physella)
1
1.3
1
1.3
Total
1
251
528.4
Estuarine Biotic Index = 2.11
Total taxa = 22
Total taxa with sensitivity values = 18
"Only 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.
1-26