Ecological Archives A025-013-A4
Trevor C. Lantz, Steve V. Kokeli, and Robert H. Fraser. 2015. Ecological recovery in an Arctic delta following widespread saline incursion. Ecological Applications 25:170–185. http://dx.doi.org/10.1890/14-0239.1
Appendix D. Results of the SIMPER analysis comparing plant community composition at impacted and unimpacted sites in the outer Mackenzie delta.
Table D1. Results of the SIMPER analysis comparing plant community composition at impacted and unimpacted site in the outer Mackenzie delta. The table shows the top four species (or species groups) that make the greatest contribution to the between-group Bray-Curtis dissimilarity for comparisons of interest. The mean cover (untransformed) of each species at the site types being compared is shown in the third and fourth columns.
| Site 1 | Site 2 | Species / Group | %Cover Sitetype 1 | %Cover Sitetype 2 | Cumulative Dissimilarity (%) |
Unimpacted |
Impacted |
Moss |
65.25 |
0.18 |
27.65 |
Dwarf Shrub |
Dwarf Shrub 2007 |
Salix lanata |
24.13 |
0 |
47.56 |
|
|
Equisetum variegatum |
16.88 |
1.63 |
63.82 |
Percent Dissimilarity |
= 93.72 |
Salix spp. (dead) |
0 |
8.09 |
77.73 |
Unimpacted |
Impacted |
Moss |
65.25 |
3.09 |
19.22 |
Dwarf Shrub |
Dwarf Shrub 2010 |
Salix lanata |
24.13 |
0 |
38.08 |
|
|
Equisetum variegatum |
16.88 |
1.55 |
52.74 |
Percent Dissimilarity |
=82.39 |
Salix spp. (dead) |
0 |
7.36 |
63.98 |
Unimpacted |
Impacted |
Salix spp. (dead) |
0.6 |
19.64 |
20.24 |
Graminoid |
Graminoid 2007 |
Moss |
32.5 |
3 |
37.69 |
|
|
Salix lanata |
17.02 |
13.43 |
53.15 |
Percent Dissimilarity |
=60.55 |
Carex aquatilis |
30.32 |
27.71 |
65.85 |
Unimpacted |
Impacted |
Moss |
32.5 |
1.79 |
23.39 |
Graminoid |
Graminoid 2010 |
Salix lanata |
17.02 |
14.14 |
41.18 |
|
|
Carex aquatilis |
30.32 |
32.14 |
53.53 |
Percent Dissimilarity |
=56.91 |
Equisetum variegatum |
2.22 |
1.79 |
61.92 |
Unimpacted |
Impacted |
Moss |
34.08 |
5.35 |
14.79 |
Upright Shrub |
Upright Shrub 2007 |
Salix lanata |
42.54 |
21.35 |
29.56 |
|
|
Salix spp. (dead) |
1.36 |
22.30 |
43.38 |
Percent Dissimilarity |
=74.7 |
Carex aquatilis |
14.46 |
1.32 |
53.98 |
Unimpacted |
Impacted |
Moss |
34.08 |
6.70 |
14.54 |
Upright Shrub |
Upright Shrub 2010 |
Salix lanata |
42.54 |
23.51 |
28.80 |
|
|
Carex aquatilis |
14.46 |
1.43 |
39.12 |
Percent Dissimilarity |
=71.3 |
Equisetum arvense |
6.85 |
4.50 |
46.30 |
Impacted |
Impacted |
Moss |
0.18 |
3.09 |
21.13 |
Dwarf Shrub 2007 |
Dwarf Shrub 2010 |
Melandrium apetalum |
0 |
2.72 |
40.89 |
|
|
Salix spp. (dead) |
8.09 |
7.36 |
56.73 |
Percent Dissimilarity |
=56.82 |
Festuca richardsonii |
0.82 |
2.18 |
71.85 |
Impacted |
Impacted |
Salix spp. (dead) |
19.64 |
1.14 |
18.87 |
Graminoid 2007 |
Graminoid 2010 |
Carex aquatilis |
27.71 |
32.14 |
32.77 |
|
|
Salix lanata |
13.43 |
14.14 |
46.15 |
Percent Dissimilarity |
=65.0 |
Moss |
3 |
1.79 |
54.62 |
Impacted |
Impacted |
Salix spp. (dead) |
22.30 |
8.50 |
13.75 |
Upright Shrub 2007 |
Upright Shrub 2010 |
Salix lanata |
21.35 |
23.51 |
25.95 |
|
|
Festuca richardsonii |
4.65 |
10.14 |
35.19 |
Percent Dissimilarity |
=72.19 |
Hedysarum alpinum |
7.60 |
7.22 |
43.76 |