20080868 Ver 2_I-69 2015 Porter Ponar Downstream Raw Data Table_20160708

Table 1-69. Numbers of benthic macro i nverteb rates collected in each ponar grab sample at the Porter
Creek downstream station in May 2015.
Species/taxon
Porter Creek Downstream Samples
1
2
3
4
5
Average
Annelida
Polychaeta
Amphicteis floridus
3
3
1
3
2
2.4
Streblospio benedicti
15
16
18
22
8
15.8
Arthropoda
Insecta
Diptera
Chironomus decorus
100
100
100
100
100
100.0
Dicrotendipes nervosus
1
0
0
0
0
0.2
Malacostraca
Amphipoda
Apocorophium sp.
0
0
1
0
0
0.2
Gammarus tigrinus
1
5
5
1
0
2.4
Mysida
Americamysis almyra
1
0
1
0
0
0.4
Ostracoda
Cyprideis littoralis
2
0
0
0
0
0.4
Mollusca
Bivalvia
Macoma balthica
1
1
0
6
1
1.8
Macoma tenta
1
1
2
2
1
1.4
Gastropoda
Littoridinops sp.
1
0
2
0
0
0.6
Total taxa by sample
126
126
1 130
1 134
1 112
Total abundance = 628
Total taxa present = 11
Shannon -Wiener diversity = 0.79
1-77