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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