20080868 Ver 2_I-46 2014 Drinkwater Ponar Downstream Biotic Index Table_20150717

Table 1 -46. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Drinkwater
Creek downstream station in May 2014.
Total 444 745.4
Estuarine Biotic Index = 1.68
Total taxa = 19
Total taxa with sensitivity values = 16
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 -52
Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)`
value (n)
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
44
1.0
30
30.0
Polychaeta
Amphicteis floridus
4
2.0
3
6.0
Mediomastus ambiseta
113
2.0
100
200.0
Polydora cornuta
1
1.2
1
1.2
Streblospio benedicti
98
1.1
30
33.0
Arthropoda
Insecta
Diptera
Chironomus decorus
415
1.0
100
100.0
Parachironomus sp.
2
1.1
1
1.1
Malacostraca
Amphipoda
Gammarus mucronatus
270
2.3
100
230.0
Gammarus tigrinus
2
2.0
1
2.0
Mysida
Americamysis almya
3
2.2
3
6.6
Tanaidacea
Hargeria rapax
1
1.6
1
1.6
Maxillopoda
Sessilia
Balanus sp.
1
2.0
1
2.0
Mollusca
Bivalvia
Macoma balthica
32
1.5
30
45.0
Macoma tenta
50
2.0
30
60.0
Mulinia lateralis
5
2.3
3
6.9
Gastropoda
Littoridinops tenuipes
20
2.0
10
20.0
Total 444 745.4
Estuarine Biotic Index = 1.68
Total taxa = 19
Total taxa with sensitivity values = 16
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 -52