Table 2 Numbers of Black-necked Cranes in different habitats in the Yarlung Tsangpo River basin, Tibet
Types | Early wintering period | Middle wintering period | ||||
|---|---|---|---|---|---|---|
Number of individuals | Number of flocks | Average flock size | Number of individuals | Number of flocks | Average flock size | |
Pasture | 247 (4.2%) | 13 (2.4%) | 19.0 ± 35.4 | 519 (7.5%) | 40 (8.2%) | 12.9 ± 24.1 |
Winter wheat land | 414 (6.9%) | 24 (4.3%) | 17.3 ± 25.1 | 49 (0.7%) | 14 (2.8%) | 3.5 ± 3.6 |
Plowed land | 2025 (34.2%) | 274 (44.7%) | 7.4 ± 17.7 | 771 (11.2%) | 89 (18.3%) | 9.3 ± 24.4 |
River | 581 (9.8%) | 35 (6.3%) | 16.6 ± 30.6 | 1212 (17.6%) | 84 (17.3%) | 14.3 ± 19.7 |
Crop stubble land | 2230 (37.6%) | 201 (36.3%) | 11.1 ± 22.3 | 4136 (60.2%) | 245 (50.4%) | 16.9 ± 36.6 |
Marsh | 429 (7.2%) | 19 (3.4%) | 22.6 ± 39.9 | 189 (2.7%) | 14 (2.9%) | 13.5 ± 24.2 |