20080868 Ver 2_I-11 2014 Little Sweep Upstream Biotic Index Table_20150717

Table 1 -11. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Little Creek upstream station in May
2014.
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Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)°
value (n)
(SV)(n)
Annelida
Oligochaeta
Dero sp.
7
1.0
3
3.0
Limnodrilus hoffineistri
1
1.0
1
1.0
Paranais litoralis
1
1.1
1
1.1
Tubificidae sp. w/o hair
58
1.0
30
30.0
Polychaeta
Amphicteis floridus
43
2.0
30
60.0
Arthropoda
Insecta
Coleptera
Peltodytes sp.
14
1.4
10
14.0
Diptera
Chironomus decorus
170
1.0
100
100.0
Cricotopus sp.
1
1.4
1
1.4
Dicrotendipes nervosus
3
1.0
3
3.0
Parachronomus sp.
1
1.1
1
1.1
Tanypus neopunctipennis
23
1.0
10
10.0
Tanytarsus sp.
30
2.3
30
69.0
Hemiptera
Abedus/Belostoma sp.
2
1.0
1
1.0
Corixidae sp.
2
1.3
1
1.3
Trichocorixa sexcinta
4
1.0
3
3.0
Odonata
Libellula sp.
2
1.1
1
1.1
Malacostraca
Amphipoda
Apocorophium sp.
1
2.2
1
2.2
Gammarus tigrinus
300
2.0
100
200.0
Isopoda
Cassidinidea lunifrons
3
2.0
3
6.0
Tanaidacea
Hargeria rapax
1
1.6
1
1.6
Mollusca
Bivalvia
Mytilopsis leucophaeta
3
1.5
3
4.5
Gastropoda
Littoridinops tenuipes
285
2.0
100
200.0
Physidae sp. (physa/physella)
124
1.3
100
130.0
Total
534
844.3
Estuarine Biotic Index = 1.58
Total taxa = 26
Total taxa with sensitivity values = 23
aOnly those taxa for which a sensitivity value is available are displayed.
TTotal number of individuals caught in all three sweep replicates.
Sensitivity values provided by NCDWR.
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