20080868 Ver 2_I-60 2017 Muddy Ponar Upstream Biotic Index Table_20180629

Table 1-60. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Muddy Creek
upstream station in May 2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value (n)
Product of
(SV)(n)
Annelida
Polychaeta
Eteone heteropoda
28
1.6
10
16.0
Marenzelleria viridis
14
2.6
10
26.0
Streblospio benedecti
12
1.1
10
11.0
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
6
2.3
3
6.9
Cricotopus sp.
2
1.4
1
1.4
Tanytarsus sp.
6
2.3
3
6.9
Malacostraca
Amphipoda
Apocorophium louisianum
10
2.2
10
22.0
Apocorophium sp.
100
2.2
100
220.0
Gammarus tigrinus
42
2.0
30
60.0
Isopoda
Cyathura polita
2
2.0
1
2.0
Mysida
Americamysis almyra
2
2.2
1
2.2
Mollusca
Bivalvia
Macoma balthica
8
1.5
3
4.5
Mytilopsis leucophaeta
4
1.5
3
4.5
Rangia cuneata
12
1.0
10
10.0
Gastropoda
Littoridinops sp.
14
2.0
10
20.0
Total
205
413.4
Estuarine Biotic Index = 2.02
Total taxa = 15
Total taxa with sensitivity values = 14
a Only those taxa for which a sensitivity value is available are displayed
b Total number of individuals caught in all five ponar replicates.
Sensitivity values provided by NCDWR.