20080868 Ver 2_I-19 2015 Huddles Sweep Upstream Biotic Index Table_20160708

Table 1-19. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Huddles Cut upstream station in
May 2015.
Species/taxono
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Enchytraeidae sp.
2
1.0
1
1.0
Tubificidae sp. wio hair
42
1.0
30
30.0
Tubificoides heterochaetus
38
1.1
30
33.0
Polychaeta
Amphicteis floridus
109
2.0
100
200.0
Laeonereis culveri
2
1.0
1
1.0
Streblospio benedicti
7
1.1
3
3.3
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
13
2.3
10
23.0
Chironomus decorus
2
1.0
1
1.0
Dicrotendipes nervosus
2
1.0
1
1.0
Glyptotendipes sp.
1
1.3
1
1.3
Goeldichironomus devineyae
10
2.0
10
20.0
Tanytarsus sp.
216
2.3
100
230.0
Malacostraca
Amphipoda
Apocorophium louisianum
17
2.2
10
22.0
Apocorophium sp.
63
2.2
30
66.0
Gammarus tigrinus
11
2.0
10
20.0
Decapoda
Palaemonetes pugio
77
2.5
30
75.0
Rhithropanopeus harrisii
3
2.5
3
7.5
Isopoda
Cassidinidea lunifrons
11
2.0
10
20.0
Mollusca
Bivalvia
Macoma balthica
2
1.5
1
1.5
Macoma tenta
8
2.0
3
6.0
Gastropoda
Littoridinops sp.
247
2.0
100
200.0
Total
485
962.6
Estuarine Biotic Index = 1.98
Total taxa = 25
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.
1-25