Table 1.
Stopover and breeding sites of the spring migration routes of whooper swans in China and Mongolia. S: Stopover site. B: Breeding site.
| Key sites | Stopover/breeding sites | No. of swans | Duration | Arrival date (median date) | Departure date (median date) |
|---|---|---|---|---|---|
| Yellow River stretch Inner Mongolia | S | 58 | 26 | 2/20-4/26,3/12 | 2/25-5/6,4/3 |
| Yumen Estuary | S | 36 | 5 | 2/17-3/28,3/9 | 2/23-3/28,3/12 |
| Ordos Lakes | S | 23 | 22 | 2/25-4/11,3/14 | 2/25-5/2,3/23 |
| Hekou Reservoir | S | 16 | 16 | 2/25-5/7,3/7 | 2/27-4//7,3/12 |
| Hongjian Nur | S | 14 | 32 | 2/19-4/13,3/8 | 2/20-4/15,3/13 |
| Ugii Lake | S | 4 | 23 | 3/27-4/29.4/14 | 4/5-5/19,5/4 |
| Ulungur Lake | B | 4 | 46 | 4/7-5/7,4/21 | 4/17-8/31,6/25 |
| Buuntsagaan Lake | S | 2 | 44 | 4/2-6/8 | 4/7-8/17 |
| Khovsgol Lake | B | 2 | 5 | 4/5-4/18 | 4/7-5/4 |
| Dood Targan Lake | B | 2 | 36 | 5/17-5/22 | 8/1-8/11 |
| Khar Us Lake | B | 2 | 18 | 3/25-5/9 | / |
| Uvsiin Khar Us Lake | B | 2 | 22 | 3/25-3/27,3/26 | 4/18 |
| Terkhiin Tsagaan Lake | B | 1 | 43 | 4/29 | 6/11 |
| Erkhel Lake | S | 1 | 42 | 5/16 | 7/12 |
| Sangiin Dalai Lake | B | 1 | 22 | 4/19 | 5/11 |
| Telmen Nur | B | 1 | / | 6/27 | / |
| Shargiin Tsagaan Lake | B | 1 | 37 | 4/22 | 5/29 |
| Hyargas Nur | B | 1 | 82 | 6/11 | 9/1 |
| Olgoi Nur | B | 1 | 30 | 5/10 | 6/9 |