20080868 Ver 2_I-11 2015 Little Sweep Upstream Biotic Index Table_20160708

Table 1-11. Estuarine Biotic Index (EBI) calculations for benthic sweep 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
160
1.0
100
100.0
Polychaeta
Amphicteis floridus
9
2.0
3
6.0
Arthropoda
Insecta
Coleptera
Peltodytes sp.
6
1.4
3
4.2
Tropisternus blatchleyi
1
1.0
1
1.0
Diptera
Bezzia/Palpomyia complex
10
2.3
10
23.0
Chironomus decorus
1
1.0
1
1.0
Chironomus sp.
1
1.0
1
1.0
Dicrotendipes nervosus
14
1.0
10
10.0
Glyptotendipes sp.
9
1.3
3
3.9
Tanypus neopunctipennis
43
1.0
30
30.0
Tanytarsus sp.
47
2.3
30
69.0
Hemiptera
Corixidae sp.
1
1.3
1
1.3
Malacostraca
Amphipoda
Gammarus tigrinus
300
2.0
100
200.0
Decapoda
Procambarus sp.
2
1.7
1
1.7
Isopoda
Cassidinidea lunifrons
4
2.0
3
6.0
Tanaidacea
Hargeria rapax
1
1.6
1
1.6
Mollusca
Gastropoda
Littoridinops sp.
59
2.0
30
60.0
Physidae sp. (physa/physella)
30
1.3
30
39.0
Total
358
558.7
Estuarine Biotic Index = 1.56
Total taxa = 25
Total taxa with sensitivitv values = 17
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.
1-17