20080868 Ver 2_I-22 2017 Porter Sweep Downstream Biotic Index Table_20180629

Table 1-22. Estuarine Biotic Index (EBI) calculations for benthic sweep samples at the Porter Creek downstream station
in May of 2017.
Species/taxon'
Number of Sensitivity Abundance
individualsb value (SV)c value n)
Product of
(SV)(n)
Annelida
Oligochaeta
Naididae sp. w/o hair
1
1.0
1
1.0
Polychaeta
Amphicteis floridus
26
2.0
10
20.0
Laeonereis culveri
2
1.0
1
1.0
Marenzellaria viridis
1
2.6
1
2.6
Polydora cornuta
1
1.2
1
1.2
Streblospio benedicti
1
1.1
1
1.1
Arthropoda
Insecta
Diptera
Dicrotendipes nervosus
25
1.0
10
10.0
Goeldichironomus devineyae
2
2.0
1
2.0
Procladius sp.
1
1.2
1
1.2
Tanytarsus sp.
6
2.3
3
6.9
Hemiptera
Trichocorixa sexcinta
1
1.0
1
1.0
Malacostraca
Amphipoda
Apocorophium lacustre
242
2.2
100
220.0
Apocorophium sp.
300
2.2
100
220.0
Gammarus tigrinus
300
2.0
100
200.0
Decapoda
Palaemonetes pugio
25
2.5
10
25.0
Rhithropanopeus harrisii
2
2.5
1
2.5
Isopoda
Cassidinidea lunifrons
7
2.0
3
6.0
Cyathura polita
14
2.0
10
20.0
Tanaidacea
Hargeria rapax
1
1.6
1
1.6
Maxillopoda
Sessilia
Balanus improvisus
2
2.0
1
2.0
Mollusca
Bivalvia
Mytilopsis leucophaeta
2
1.5
1
1.5
Gastropoda
Littoridinops sp.
224
2.0
100
200.0
Total
458
946.6
Estuarine Biotic Index = 2.07
Total taxa = 25
Total taxa with sensitivity values = 21
'Only 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.
1-26