20080868 Ver 2_I-19 2017 Huddles Sweep Upstream Biotic Index Table_20180629

Table I-19. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Huddles Cut upstream station in
May 2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)'
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Naididae sp. w/o hair
3
1.0
3
3.0
Tubificoides heterochaetus
15
1.1
10
11.0
Polychaeta
Amphicteis floridus
16
2.0
10
20.0
Laeonereis culveri
5
1.0
3
3.0
Polydora cornuta
4
1.2
3
3.6
Streblospio benedicti
6
1.1
3
3.3
Arthropoda
Insecta
Coleoptera
Berosus sp.
6
1.5
3
4.5
Diptera
Bezzia/Palpomyia complex
8
2.3
3
6.9
Chironomus decorus
16
1.0
10
10.0
Tanypus neopunctipennis
9
1.0
3
3.0
Tanytarsus sp.
19
2.3
10
23.0
Odonata
Enallagma sp.
1
1.5
1
1.5
Malacostraca
Amphipoda
Apocorophium lacustre
9
2.2
3
6.6
Apocorophium louisianum
8
2.2
3
6.6
Apocorophium sp.
110
2.2
100
220.0
Gammarus tigrinus
47
2.0
30
60.0
Decapoda
Palaemonetes pugio
67
2.5
30
75.0
Isopoda
Edotia montosa
10
2.6
10
26.0
Mysida
Americamysis almyra
1
2.2
1
2.2
Maxillopoda
Sessilia
Balanus improvisus
3
2.0
3
6.0
Mollusca
Bivalvia
Macoma tenta
3
2.0
3
6.0
Mytilopsis leucophaeata
1
1.5
1
1.5
Rangia cuneata
7
1.0
3
3.0
Gastropoda
Littoridinops sp.
183
2.0
100
200.0
Total
349
705.7
Estuarine Biotic Index = 2.02
Total taxa = 25
Total taxa with sensitivitv values = 22
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.
1-23