20080868 Ver 2_I-44 2015 Drinkwater Ponar Upstream Biotic Index Table_20160708

Table 1-44. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Drinkwater
Creek upstream 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
8
1.0
3
3.0
Polychaeta
Amphicteis floridus
27
2.0
10
20.0
Eteone heteropoda
2
1.6
1
1.6
Laeonereis culveri
3
1.0
3
3.0
Marenzelleria viridis
2
2.6
1
2.6
Streblospio benedicti
5
1.1
3
3.3
Arthropoda
Insecta
Coleoptera
Berosus sp.
5
1.5
3
4.5
Diptera
Bezzia/Palpomyia complex
6
2.3
3
6.9
Chironomus decorus
63
1.0
30
30.0
Dicrotendipes nervosus
1
1.0
1
1.0
Goeldichironomus devineyae
3
2.0
3
6.0
Tanypus neopunctipennis
20
1.0
10
10.0
Tanytarsus sp.
30
2.3
30
69.0
Malacostraca
Amphipoda
Apocorophium sp.
3
2.2
3
6.6
Gammarus tigrinus
6
2.0
3
6.0
Mysida
Americamysis almyra
1
2.2
1
2.2
Mollusca
Bivalvia
Macoma balthica
1
1.5
1
1.5
Mytilopsis leucophaeata
1
1.5
1
1.5
Gastropoda
Littoridinops sp.
67
2.0
30
60.0
Total
140
238.7
Estuarine Biotic Index = 1.71
Total taxa = 22
Total taxa with sensitivity values = 19
' 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