20080868 Ver 2_I-48 2015 Little Ponar Upstream Biotic Index Table_20160708

Table 1-48. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Little Creek
upstream station in May 2015.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
78
1.0
30
30.0
Polychaeta
Amphicteis floridus
60
2.0
30
60.0
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
2
2.3
1
2.3
Chironomus decorus
4
1.0
3
3.0
Dicrotendipes nervosus
2
1.0
1
1.0
Glyptotendipes sp.
30
1.3
30
39.0
Tanypus neopunctipennis
2
1.0
1
1.0
Tanytarsus sp.
6
2.3
3
6.9
Malacostraca
Amphipoda
Gammarus tigrinus
284
2.0
100
200.0
Mollusca
Gastropoda
Littoridinops sp.
30
2.0
30
60.0
Physidae sp. (physalphysella)
4
1.3
3
3.9
Total
232
407.1
Estuarine Biotic Index = 1.75
Total taxa = 12
Total taxa with sensitivity values = 11
a Only those taxa for which a sensitivity value is available are displayed.
bTotal number of individuals caught in all five ponar replicates.
° Sensitivity values provided by NCDWR.
I.