20080868 Ver 2_I-52 2017 Long Ponar Upstream Biotic Index Table_20180629

Table 1-52. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Long 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
14
2.0
10
20.0
Eteone heteropoda
3
1.6
3
4.8
Marenzelleria viridis
134
2.6
100
260.0
Streblospio benedicti
15
1.1
10
11.0
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
1
2.3
1
2.3
Chironomus decorus
109
1.0
100
100.0
Tanypus neopunctipennis
11
1.0
10
10.0
Tanytarsus sp.
1
2.3
1
2.3
Ephemeroptera
Callibaetis sp.
1
1.1
1
1.1
Hemiptera
Abedus/Belostoma complex
1
1.0
1
1.0
Odonata
Enallagma sp.
2
1.5
1
1.5
Malacostraca
Amphipoda
Apocorophium lacustre
16
2.2
10
22.0
Apocorophium louisianum
13
2.2
10
22.0
Apocorophium sp.
90
2.2
30
66.0
Gammarus mucronatus
11
2.3
10
23.0
Gammarus tigrinus
209
2.0
100
200.0
Isopoda
Cassidinidea lunifrons
1
2.0
1
2.0
Edotia montosa
1
2.6
1
2.6
Mysida
Americamysis almyra
17
2.2
10
22.0
Mollusca
Bivalvia
Macoma balthica
11
1.5
10
15.0
Rangia cuneata
3
1.0
3
3.0
Gastropoda
Littoridinops sp.
115
2.0
100
200.0
Total
523
991.6
Estuarine Biotic Index = 1.90
Total taxa = 25
Total taxa with sensitivitv values = 21
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.
1-58