20080868 Ver 2_I-62 2014 Muddy Ponar Downstream Biotic Index Table_20150717

Table 1 -62. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Muddy Creek
downstream station in May 2014.
.:
Number of
Sensitivity
Abundance
Product of
Species /taxona
individuals"
value (SV)°
value (n)
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
7
1.0
3
3.0
Polychaeta
Amphicteis floridus
6
2.0
3
6.0
Eteone heteropoda
9
1.6
3
4.8
Mediomastus ambiseta
2
2.0
1
2.0
Polydora cornuta
11
1.2
10
12.0
Streblospio benedicti
14
1.1
10
11.0
Arthropoda
Insecta
Diptera
Chironomus decorus
419
1.0
100
100.0
Parachironomus sp.
10
1.1
10
11.0
Tanytarsus sp.
1
2.3
1
2.3
Malacostraca
Amphipoda
Apocorophium louisianum
6
2.2
3
6.6
Apocorophium sp.
10
2.2
10
22.0
Gammarus mucronatus
9
2.3
3
6.9
Gammarus tigrinus
3
2.0
3
6.0
Mysida
Americamysis almyra
9
2.2
3
6.6
Tanaidacea
Hargeria rapax
1
1.6
1
1.6
Mollusca
Bivalvia
Macoma balthica
5
1.5
3
4.5
Macoma tents
18
2.0
10
20.0
Gastropoda
Littoridinops tenuipes
1
2.0
1
2.0
Total
178
228.3
Estuarine Biotic Index = 1.28
Total taxa = 19
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.
.: