|
Species
|
2016
|
2017
|
2018
|
2019
|
2016–2019
|
|---|
|
Age ratio
|
Survey sample (IH)
|
Age ratio
|
Survey sample (IH)
|
Age ratio
|
Survey sample (IH)
|
Age ratio
|
Survey sample (IH)
|
Optimal future survey sample
|
|---|
|
Swan Goose
|
0.133
|
1153
|
0.096
|
868
|
0.108
|
963
|
0.175
|
1444
|
2761
|
|
Lesser White-fronted Goose
|
0.344
|
2257
|
0.060
|
564
|
0.090
|
819
|
0.113
|
1002
|
826
|
|
Siberian Crane
|
0.178
|
1463
|
0.039
|
375
|
0.146
|
1247
|
0.173
|
1431
|
1129
|
|
Hooded Crane
|
0.257
|
1909
|
0.169
|
1404
|
0.231
|
1776
|
0.252
|
1885
|
1744
|
|
White-naped Crane
|
0.243
|
1839
|
0.125
|
1094
|
0.188
|
1527
|
0.253
|
1890
|
1588
|
|
Greater White-fronted Goose
|
0.164
|
1371
|
0.122
|
1071
|
0.138
|
1190
|
0.187
|
1520
|
6364
|
|
Greylag Goose
|
0.259
|
1919
|
0.104
|
900
|
0.170
|
1411
|
0.220
|
1716
|
1312
|
|
Bean Goose
|
0.180
|
1476
|
0.104
|
900
|
0.150
|
1275
|
0.140
|
1204
|
8955
|
|
Bewick’s Swan
|
0.240
|
1824
|
0.125
|
1056
|
0.200
|
1600
|
0.250
|
1875
|
5844
|
|
Common Crane
|
0.190
|
1539
|
0.135
|
1204
|
0.180
|
1476
|
0.240
|
1824
|
1511
|
- By then applying the overall sqrt_sum_Weight of each species (see “Methods” section, values derived from Additional file 1: Table S11), we can generate a value for the optimal future survey sample size to generate robust species juvenile ratios. IH means the independence hypothesis
