Table 2 Comparison of spring migration parameter values (Mean ± SD) from the three groups of Eurasian Spoonbill of different summer provenances in China from 2016 to 2019, based on data from solar GPS/GSM satellite trackers
Season | Breeding provenance (Winter area) | Bird ID | Start date | End date | Migration distance (km) | Migration duration (days) | Migration speed (km/day) | Number of stopovers | Stopover duration (days) | Daily travel speed (km/day) | Straightness index |
|---|---|---|---|---|---|---|---|---|---|---|---|
Spring | Naoli River (Jiangsu coast) | Mean ± SD | May 13 ± 3.0 (days) | Jun 3 ± 11.5 (days) | 2432 ± 590 | 21.4 ± 14.4 | 173.9 ± 89.3 | 1.5 ± 0.5 | 12.4 ± 10.4 | 302± 67 | 0.78 ± 0.18 |
Median | 2017/5/13 | 2017/6/3 | 2432 | 21.4 | 173.9 | 1.5 | 12.4 | 302 | 0.78 | ||
ES01 | 2017/5/16 | 2017/5/23 | 1842 | 7 | 263.2 | 1 | 2.0 | 368 | 0.96 | ||
ES02 | 2017/5/10 | 2017/6/15 | 3022 | 35.8 | 84.5 | 2 | 22.9 | 235 | 0.6 | ||
Inner Mongolia (Yangtze River) | ES05 | 2018/2/13 | 2018/4/16 | 2452 | 61.4 | 39.9 | 4 | 53.8 | 320 | 0.86 | |
Western Mongolia (Yangtze River) | Mean ± SD | May 6 ± 7.32 (days) | May 19 ± 15.67 (days) | 1897 ± 500 | 13.07 ± 8.83 | 372.8 ± 371.1 | 1 ± 0.82 | 9.6 ± 7.4 | 611 ± 205 | 0.82 ± 0.02 | |
Median | 2019/5/9 | 2019/5/16 | 1551 | 14.3 | 112.0 | 1 | 10.6 | 508 | 0.82 | ||
ES06 | 2019/5/2 | 2019/5/16 | 1551 | 14.3 | 108.9 | 1 | 10.6 | 428 | 0.84 | ||
ES07 | 2019/5/17 | 2019/6/9 | 2604 | 23.3 | 112.0 | 2 | 18.1 | 508 | 0.79 | ||
ES08 | 2019/5/1 | 2019/5/2 | 1535 | 1.7 | 897.6 | 0 | 0 | 898 | 0.82 |