20080868 Ver 2_I-23 2017 Duck Sweep Upstream Biotic Index Table_20180629

Table 1-23. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Duck Creek upstream station in
May 2017.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)'
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Enchytraeidae sp.
72
1.0
30
30.0
Naididae (Naidinae) sp.
2
1.0
1
1.0
Naididae sp. w/o hair
168
1.0
100
100.0
Paranais sp.
115
1.1
100
110.0
Tubificoides heterochaetus
3
1.1
3
3.3
Polychaeta
Amphicteis floridus
11
2.0
10
20.0
Arthropoda
Insecta
Coleoptera
Peltodytes sp.
7
1.4
3
4.2
Diptera
Atrichopogon sp.
2
2.3
1
2.3
Bezzia/Palpomyia complex
12
2.3
10
23.0
Chironomus decorus
6
1.0
3
3.0
Dicrotendipes nervosus
31
1.0
30
30.0
Glyptotendipes sp.
10
1.3
10
13.0
Polypedilum sp.
1
1.5
1
1.5
Procladius sp.
7
1.2
3
3.6
Tanytarsus sp.
41
2.3
30
69.0
Hemiptera
Abedus/Belostoma complex
7
1.0
3
3.0
Corixidae sp.
24
1.3
10
13.0
Ranatra sp.
4
2.6
3
7.8
Sigara sp.
2
1.4
1
1.4
Odonata
Enallagma sp.
1
1.5
1
1.5
Malacostraca
Amphipoda
Gammarus tigrinus
300
2.0
100
200.0
Decapoda
Procambarus sp.
1
1.7
1
1.7
Isopoda
Cassidindea lunifrons
13
2.0
10
20.0
Mysida
Americamysis almyra
1
2.2
1
2.2
Mollusca
Gastropoda
Littoridinops sp.
195
2.0
100
200.0
Physidae sp. (physa/pysella)
3
1.3
3
3.9
Total
568
868.4
Estuarine Biotic Index = 1.53
Total taxa = 34
Total taxa with sensitivitv values = 23
aOnly those taxa for which a sensitivity value is available are displayed
bTotal number of individuals caught in all three sweep replicates.
`Sensitivity values provided by NCDWR.
1-27