Table 6.
Comparison of Euclidean and flowpath distance to stream for VC (variably connected) and NCO (no connection observed) wetland classes by ecoregion
| Ecoregion | VC wetland Euclidean distance to stream (m)a | VC wetland flowpath distance to stream (m)b 1 | NCO wetland Euclidean distance to stream (m)c 2 | NCO wetland flowpath distance to stream (m)d 3 | VC wetland distance increase (%) | NCO wetland distance increase (%) |
|---|---|---|---|---|---|---|
| Lowland |
67.91 (66.7, 69.2, n = 7597) |
205.81 (202.4, 209.4, n = 7597) |
352.01 (349.8, 354.1, n = 38,199) |
943.31 (937.1, 949.5, n = 38,199) |
203.0 | 168.0 |
| Des Moines Lobe |
128.22 (125.2, 131.3, n = 3830) |
346.42 (338.5, 354.5, n = 3830) |
426.92 (422.9, 430.9, n = 12,542) |
1050.72 (1039.9, 1061.7, n = 12,542) |
170.2 | 146.1 |
| Prairie Coteau |
189.23 (186.4, 192.0, n = 11,653) |
442.73 (436.5, 449.0, n = 11,653) |
376.93 (375.2, 378.5, n = 63,305) |
908.63 (904.3, 912.9, n = 63,305) |
134.0 | 141.1 |
| Missouri Coteau | 281.04 (273.0, 288.9, n = 2631) |
644.04 (626.9, 661.7, n = 2631) |
1042.84 (1038.2, 1047.5, n = 54,133) |
2929.14 (2913.9, 2944.4, n = 54,133) |
129.2 | 180.9 |
| Drift Plains |
302.84 (299.5, 306.1, n = 20,610) |
762.55 (754.0, 771.1, n = 20,610) |
1115.15 (1112.5, 1117.6, n = 187,585) |
2863.64 (2856.1, 2871.2,n = 187,585) |
151.8 | 156.8 |
| Devils Lake |
1103.75 (1091.7),1115.8, n = 12,752) |
2465.96 (2436.3, 2495.9, n = 12,752) |
1844.96 (1838.6, 1851.3, n = 66,827) |
4702.95 (4684.2, 4721.7, n = 66,827) |
123.4 | 154.9 |
| All |
283.8 (281.8, 285.8, n = 59,073) |
708.2 (703.2, 713.2, n = 59,073) |
891.1 (889.5, 892.7, n = 422,591) |
2298.1 (2293.5, 2302.7, n = 422,591) |
149.5 | 198.7 |
Columns 1–4: Geometric mean distance (and 95% confidence interval) by class and ecoregion. Superscripts indicate significant (p ≪ 0.05) differences in pairwise comparisons of ecoregion means using Tukey’s honest significant difference (HSD) tests of log-transformed distance. Columns 5–6: Percentage increase in mean wetland distance to stream using flowpath versus Euclidean distance
Differences between ecoregions were significant for all categories (p < 0.01) using ANOVA (aF = 3891, b 1F = 3051, c 2F = 25,500, d 3F = 19,309)