20080868 Ver 2_I-82 2014 DCUT11 Ponar Downstream Biotic Index Table_20150717

Table 1 -82. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the DCUT11
downstream station in May 2014.
Number of
Sensitivity
Abundance
Product of
Species /taxona
individualsb
value (SV)`
value (n)
(SV)(n)
Annelida
Polychaeta
Amphicteis floridus
447
2.0
100
200.0
Eteone heteropoda
7
1.6
3
4.8
Heteromastus filiformis
9
1.1
3
3.3
Marenzelleria viridis
3
2.6
3
7.8
Streblospio benedicti
21
1.1
10
11.0
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
90
2.3
30
69.0
Chironomus decorus
165
1.0
100
100.0
Cricotopus sp.
7
1.4
3
4.2
Dicrotendipes nervosus
114
1.0
100
100.0
Goe/dichironomus devineyae
33
2.0
30
60.0
Parachironomus sp.
34
1.1
30
33.0
Tanytarsus sp.
59
2.3
30
69.0
Hemiptera
Corixidae sp.
6
1.3
3
3.9
Odonata
Enallagma sp.
4
1.5
3
4.5
Malacostraca
Amphipoda
Apocorophium sp.
6
2.2
3
6.6
Gammarus mucronatus
22
2.3
10
23.0
Gammarus tigrinus
400
2.0
100
200.0
Decapoda
Rhithropanopeus harrisii
3
2.5
3
7.5
Isopoda
Cyathura polita
3
2.0
3
6.0
Edotia montosa
3
2.6
3
7.8
Tanaidacea
Hargeria rapax
4
1.6
3
4.8
Mollusca
Bivalvia
Macoma balthica
4
1.5
3
4.5
Macoma tenta
4
2.0
3
6.0
Mytilopsis leucophaeata
3
1.5
3
4.5
Gastropoda
Littoridinops tenuipes
102
2.0
100
200.0
::

Total
Estuarine Biotic Index = 1.67
Total taxa = 28
682 1141.2
Total taxa with sensitivity values = 25
Only those taxa for which a sensitivity value is available are displayed.
bTotal number of individuals caught in all five ponar replicates.
° Sensitivity values provided by NCDWR.
::