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Zoological Research
Kunming Institute of Zoology, Chinese Academy of Sciences
ISSN: 2095-8137
Vol. 29, No. 5, 2008, pp. 553-560
Bioline Code: zr08084
Full paper language: Chinese
Document type: Research Article
Document available free of charge

Zoological Research, Vol. 29, No. 5, 2008, pp. 553-560

 en Flock of Black-necked Crane Wintering at Napahai Nature Reserve, China
LIU, Qiang; YANG, Xiao-jun; ZHU, Jian-guo; ZHAO, Jian-lin & YU, Hong-zhong

Abstract

From October 2004 to May 2005, flock size and composition of wintering black-necked cranes ( Grus nigricollis check for this species in other resources ) were studied using spot scanning technique at Napahai Nature Reserve in Yunnan province. At night, the mean wintering population size was 67.9 (16-157, n=17). Composed by common crane ( Grus grus check for this species in other resources ) or not, roost cranes were divided into sing-species flock and mixed-species flock. The numbers of crane in sing-species flock were 65.3% of total black-necked cranes. In the day, feeding flocks were classified into three types: family group comprised of breeding pair and their offspring ranging between two to four; sub-adult flock composed mainly by sub-adults ranging between three to 65 with an average size of 16.1(n=1017); special flock composed by single cranes. Black-necked crane flocks were affected by season, temperature, breeding status, food abundance and availability, and their sizes changed significantly in daytime or between different months (P=0.000<0.05). After family breakup happened in late March, Juveniles were drove away by their parents and then they got together to join the sub-adult flocks.

 
© Copyright 2008 Kunming Institute of Zoology, the Chinese Academy of Sciences
Alternative site location: http://www.zoores.ac.cn/

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