20080868 Ver 2_I-44 2017 Drinkwater Ponar Upstream Biotic Index Table_20180629

Table 1-44. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Drinkwater
Creek upstream station in May 2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)c
Abundance
value (n)
Product of
SV)(n)
Annelida
Polychaeta
Amphicteis floridus
309
2.0
100
200.0
Laeonereis culveri
11
1.0
10
10.0
Streblospio benedicti
2
1.1
1
1.1
Arthropoda
Insecta
Coleoptera sp.
Berosus sp.
8
1.5
3
4.5
Diptera
Bezzia/Palpomyia complex
6
2.3
3
6.9
Chironomus decorus
2
1.0
1
1.0
Dicrotendipes nervosus
4
1.0
3
3.0
Parachironomus sp.
4
1.1
3
3.3
Tanypus neopunctipennis
2
1.0
1
1.0
Tanytarsus sp.
25
2.3
10
23.0
Hemiptera
Corixidae sp.
16
1.3
10
13.0
Malacostraca
Amphipoda
Apocorophium louisianum
8
2.2
3
6.6
Apocorophium sp.
35
2.2
30
66.0
Gammarus tigrinus
278
2.0
100
200.0
Mysida
Americamysis almyra
2
2.2
1
2.2
Mollusca
Bivalvia
Rangia cuneata
2
1.0
1
1.0
Gastropoda
Littoridinops sp.
174
2.0
100
200.0
Total
380
742.6
Estuarine Biotic Index = 1.95
Total taxa = 19
Total taxa with sensitivitv values = 16
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.
1-50