20080868 Ver 2_I-42 2015 PA2 Ponar Downstream Biotic Index Table_20160708

Table 1-42. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the PA2
downstream station in Mav 2015.
Species/taxona
Number of
individualsb
Sensitivity
value (SV)`
Abundance
value n
Product of
(SV)(n)
Annelida
Oligochaeta
Tubificidae sp. w/o hair
10
1.0
10
10.0
Polychaeta
Amphicteis floridus
66
2.0
30
60.0
Eteone heteropoda
7
1.6
3
4.8
Heteromastus filiformis
1
1.1
1
1.1
Laeonereis culveri
12
1.0
10
10.0
Marenzelleria viddis
1
2.6
1
2.6
Mediomastus ambiseta
3
2.0
3
6.0
Polydora cornuta
2
1.2
1
1.2
Streblospio benedecti
28
1.2
10
12.0
Arthropoda
Insecta
Diptera
Bezzia/Palmonyia complex
17
2.3
10
23.0
Chironomus decorus
56
1.0
30
30.0
Dicrotendipes nervosus
2
1.0
1
1.0
Goeldichironomus devineyae
3
2.0
3
6.0
Parachironomus sp.
1
1.1
1
1.1
Tanypus neopunctipennis
83
1.0
30
30.0
Tanytarsus sp.
152
2.3
100
230.0
Hemiptera
Corixidae sp.
4
1.3
3
3.9
Malacostraca
Amphipoda
Apocorophium louisianum
11
2.2
10
22.0
Apocorophium sp.
48
2.2
30
66.0
Gammarus tigrinus
159
2.0
100
200.0
Isopoda
Edotia montosa
1
2.6
1
2.6
Mollusca
Bivalvia
Macoma balthica
3
1.5
3
4.5
Macoma tenta
1
2.0
1
2.0
Mytilopsis leucophaeta
2
1.5
1
1.5
Gastropoda
Littoridinops sp.
106
2.0
100
200.0
Total
493
931.3
1-50

Estuarine Biotic Index = 1.89
Total taxa = 27
Total taxa with sensitivity values = 24
a 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.
1-50