20080868 Ver 2_I-62 2017 Muddy Ponar Downstream Biotic Index Table_20180629

Table 1-62. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Muddy Creek
downstream station in May 2017.
Species/taxon a
Number of
individualsb
Sensitivity
value (SV)c
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Naididae sp. w/o hair
1
1.0
1
1.0
Polychaeta
Amphicteis floridus
1
2.0
1
2.0
Eteone heteropoda
12
1.6
10
16.0
Marenzelleria viridis
83
2.6
30
78.0
Mediomastus ambiseta
9
2.0
3
6.0
Streblospio benedicti
16
1.1
10
11.0
Arthropoda
Insecta
Diptera
Chironomus decorus
1
1.0
1
1.0
Hemiptera
Corixidae sp.
1
1.3
1
1.3
Malacostraca
Amphipoda
Apocorophium louisianum
1
2.2
1
2.2
Apocorophium sp.
15
2.2
10
22.0
Gammarus tigrinus
33
2.0
30
60.0
Isopoda
Edotia montosa
3
2.6
3
7.8
Mysida
Americamysis almyra
3
2.2
3
6.6
Mollusca
Bivalvia
Macoma balthica
7
1.5
3
4.5
Macoma tenta
2
2.0
1
2.0
Mytilopsis leucophaeata
2
1.5
1
1.5
Rangia cuneata
4
1.0
3
3.0
Gastropoda
Littoridinops sp.
3
2.0
3
6.0
Total
1
115
231.9
Estuarine Biotic Index = 2.02
Total taxa = 19
Total taxa with sensitivity values = 17
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.
10