20080868 Ver 2_I-69 2017 Porter Ponar Downstream Raw Data Table_20180629

Table 1-69. Numbers of benthic macroinvertebrates collected in each ponar grab sample at the Porter
Creek downstream station in May 2017.
Species/taxon
Porter Creek Downstream Samples
1
2
3
4
5
Average
Annelida
Polychaeta
Amphicteis floridus
24
39
40
14
53
34.0
Marenzellaria viridis
16
16
19
14
10
15.0
Polydora cornuta
2
3
4
2
3
2.8
Streblospio benedicti
11
39
49
14
37
30.0
Arthropoda
Insecta
Coleoptera
Berosus sp.
0
0
0
0
1
0.2
Diptera
Chironomus decorus
26
54
29
36
39
36.8
Coelotanypus sp.
1
1
0
0
0
0.4
Procladius sp.
2
11
1
4
4
4.4
Malacostraca
Amphipoda
Apocorophium lacustre
3
3
10
0
1
3.4
Apocorophium sp.
0
6
23
2
3
6.8
Gammarus tigrinus
9
2
13
2
2
5.6
Isopoda
Cyathura polita
0
0
0
0
1
0.2
Ostracoda
Cyprideis littoralis
4
0
0
0
0
0.8
Mollusca
Bivalvia
Rangia cuneata
5
5
7
2
4
4.6
Gastropoda
Littoridinops sp.
6
6
5
1
0
3.6
Total taxa by sample
109
185
200
91
158
Total abundance = 743
Total taxa present = 14
Shannon -Wiener diversitv = 2.03
1-75