20080868 Ver 2_I-21 2014 Porter Sweep Upstream Biotic Index Table_20150717

Table 1 -21. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Porter Creek upstream station in
May 2014.
IM
Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)`
value (n)
(SV)(n)
Annelida
Oligochaeta
Pelosco /ex heterochaetus
9
1.1
3
3.3
Tubificidae sp. w/o hair
23
1.0
10
10.0
Polychaeta
Amphicteis floridus
242
2.0
100
200.0
Polydora cornuta
3
1.2
3
3.6
Streblospio benedicti
9
1.1
3
3.3
Arthropoda
Insecta
Coleoptera
Berosus sp.
6
1.5
3
4.5
Diptera
Bezzia/Palpomyia complex
18
2.3
10
23.0
Chironomus decorus
22
1.0
10
10.0
Dicrotendipes nervosus
200
1.0
100
100.0
Parachironomus sp.
9
1.1
3
3.3
Procladius sp.
6
1.2
3
3.6
Tanypus neopunctipennis
3
1.0
3
3.0
Tanytarsus sp.
173
2.3
100
230.0
Hemiptera
Abedus/Belostoma sp.
9
1.0
3
3.0
Corixidae sp.
19
1.3
10
13.0
Ranatra sp.
3
2.6
3
7.8
Trichocorixa sexcinta
4
1.0
3
3.0
Odonata
Enallagma sp.
9
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium lacustre
20
2.2
10
22.0
Apocorophium louisianum
18
2.2
10
22.0
Apocorophium sp.
164
2.2
100
220.0
Gammarus mucronatus
3
2.3
3
6.9
Gammarus tigrinus
300
2.0
100
200.0
Isopoda
Cassidinidea lunifrons
45
2.0
30
60.0
Cyathura polita
12
2.0
10
20.0
Tanaidacea
Hargeria rapax
7
1.6
3
4.8
Mollusca
Bivalvia
Mytilopsis leucophaeta
4
1.5
3
4.5
Gastropoda
Littoridinops tenuipes
261
2.0
100
200.0
Total
742
1,389.1
Estuarine Biotic Index = 1.87
Total taxa = 30
Total taxa with sensitivity values = 28
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 NCDW R.
IM