[1]College of Life Science;
Hebei University;
54 East Road;
Baoding 071000;
China;
[2]Ministry of Education Key Laboratory for Ecology of Tropical Islands;
College of Life Sciences;
Hainan Normal University;
Haikou 571158;
China;
[2]Ministry of Education Key Laboratory for Ecology of Tropical Islands;
College of Life Sciences;
Hainan Normal University;
Haikou 571158;
China;
[1]College of Life Science;
Hebei University;
54 East Road;
Baoding 071000;
China;
[1]College of Life Science;
Hebei University;
54 East Road;
Baoding 071000;
China;
[3]College of Life Science;
Hebei Agricultural University;
Yu Ling Temple Street No. 289;
Baoding 071000;
China;
[1]College of Life Science;
Hebei University;
54 East Road;
Baoding 071000;
China;
Bird song; Dusky Warbler; Male condition; Male weight; Song characteristics;