20080868 Ver 2_I-66 2017 Huddles Ponar Downstream Biotic Index Table_20180629

Table 1-66. Estuarine Biotic Index (EBI) calculations for benthic ponar samples at the Huddles Cut
downstream station in May 2017.
Species/taxon a
Number of
individualsb
Sensitivity
value (SV)c
Abundance
value (n)
Product of
(SV)(n)
Annelida
Oligochaeta
Naididae sp. w/o hair
2
1
1
1.0
Tubificoides heterochaetus
2
1.1
1
1.1
Polychaeta
Amphicteis floridus
120
2.0
100
200.0
Eteone heteropoda
8
1.6
3
4.8
Heteromastus filiformis
9
1.1
3
3.3
Marenzelleria viridis
2
2.6
1
2.6
Neanthes succinea
16
1.7
10
17.0
Polydora cornuta
2
1.2
1
1.2
Streblospio benedicti
4
1.1
3
3.3
Arthropoda
Insecta
Diptera
Bezzia/Palpomyia complex
2
2.3
1
2.3
Chironomus decorus
462
1.0
100
100.0
Goeldichironomus decineyae
2
2.0
1
2.0
Tanytarsus sp.
2
2.3
1
2.3
Malacostraca
Amphipoda
Apocorophium lacustre
4
2.2
3
6.6
Apocorophium sp.
6
2.2
3
6.6
Gammarus tigrinus
3
2.0
3
6.0
Decapoda
Palaemonetes pugio
5
2.5
3
7.5
Isopoda
Cyathura polita
4
2.0
3
6.0
Edotia montosa
4
2.6
3
7.8
Mollusca
Bivalvia
Macoma balthica
16
1.5
10
15.0
Macoma tenta
26
2.0
10
20.0
Rangia cuneata
55
1.0
30
30.0
Gastropoda
Littoridinops sp.
29
2.0
10
20.0
Total
304
466.4
Estuarine Biotic Index = 1.53
Total taxa = 24
Total taxa with sensitivitv values = 21
a Only those taxa for which a sensitivity value is available are displayed
b Total number of individuals caught in all five ponar replicates.
° Sensitivity values provided by NCDWR.
1-72