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Table 3 Comparison and Wilcoxon rank-sum test results of migration parameters (Mean ± SD) of Eurasian Spoonbills from Naoli River, China in 2016 and western Mongolia in 2018

From: Migration routes, behavior and protection status of Eurasian Spoonbills (Platalea leucorodia) wintering in China

Migration parameters Naoli River China
Autumn (2016) (N = 4)
Western Mongolia
Autumn (2018) (N = 5)
Results of Wilcoxon rank-sum test for differences between means
Mean ± SD Median Mean ± SD Median W P
Start date Oct 20 ± 1.3 (days) 2016/10/20 Sep 10 ± 16.9 (days) 2018/9/2  −   − 
End date Nov 27 ± 11.5 (days) 2016/11/30 Nov 10 ± 9.3 (days) 2018/11/8  −   − 
Migration distance (km) 2376 ± 161 2436 3466 ± 527 3685 0 0.0159
Migration duration (days) 38.6 ± 10.6 40.9 61.0 ± 16.3 68.1 3 0.1111
Migration speed (km/day) 68.4 ± 25.3 61.2 61.4 ± 21.9 54.1 13 0.5556
Number of stopovers 1.75 ± 0.43 2.0 3.4 ± 1.02 3.0 1.5 0.0398
Stopover duration (days) 31.2 ± 11.4 31.4 54.0 ± 14.6 59.3 3 0.1111
Daily travel speed (km/day) 358 ± 104 353 545 ± 198 422 4 0.1905
Straightness index 0.82 ± 0.05 0.83 0.78 ± 0.08 0.78 14 0.4127