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Table 1 The overall annual juvenile ratio (expressed as proportion of first winter birds out of all birds aged) among 10 large-bodied waterbird species sampled in the Yangtze River Floodplain from 2016 to 2019

From: Organising a juvenile ratio monitoring programme for 10 key waterbird species in the Yangtze River floodplain: analysis and proposals

Species 2016 2017 2018 2019 Mean ± SD
Common Crane 0.187 0.135 0.184 0.241 0.187 ± 0.037
Siberian Crane 0.178 0.039 0.146 0.173 0.134 ± 0.056
Hooded Crane 0.257 0.169 0.231 0.252 0.227 ± 0.035
White-naped Crane 0.146 0.125 0.188 0.253 0.178 ± 0.049
Swan Goose 0.133 0.096 0.108 0.175 0.128 ± 0.030
Lesser White-fronted Goose 0.344 0.060 0.090 0.113 0.152 ± 0.112
Greater White-fronted Goose 0.164 0.122 0.138 0.187 0.153 ± 0.025
Greylag Goose 0.259 0.104 0.165 0.222 0.188 ± 0.059
Bean Goose 0.184 0.104 0.153 0.137 0.145 ± 0.029
Bewick’s Swan 0.241 0.125 0.198 0.251 0.204 ± 0.050
  1. The values in bold represent the lowest juvenile ratio from all 4 years for each species, which for all species fell in 2017