20080868 Ver 2_I-62 2015 Muddy Ponar Downstream Biotic Index Table_20160708

Table 1-62. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Muddy Creek
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
40
1.0
30
30.0
Tubificoides heterochaetus
21
1.1
10
11.0
Polychaeta
Amphicteis floridus
18
2.0
10
20.0
Eteone heteropoda
5
1.6
3
4.8
Marenzelleria viridis
5
2.6
3
7.8
Mediomastus ambiseta
3
2.0
3
6.0
Streblospio benedicti
49
1.1
30
33.0
Arthropoda
Insecta
Diptera
Chironomus decorus
367
1.0
100
100.0
Parachironomus sp.
1
1.1
1
1.1
Tanypus neopunctipennis
1
1.0
1
1.0
Tanytarsus sp.
1
2.3
1
2.3
Malacostraca
Amphipoda
Apocorophium sp.
3
2.2
3
6.6
Gammarus mucronatus
1
2.3
1
2.3
Gammarus tigrinus
2
2.0
1
2.0
Isopoda
Edotia montosa
4
2.6
3
7.8
Mysida
Americamysis almyra
7
2.2
3
6.6
Mollusca
Bivalvia
Macoma balthica
16
1.5
10
15.0
Macoma tenta
31
2.0
30
60.0
Gastropoda
Littoridinops sp.
9
2.0
3
6.0
Total
1
246
323.3
Estuarine Biotic Index = 1.31
Total taxa = 20
Total taxa with sensitivity values = 18
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.
1-70