Volume 29 Issue 5
Sep.  2008
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LIU Qiang, YANG Xiao-jun, ZHU Jian-guo, ZHAO Jian-lin, YU Hong-zhong. Flock of Black-necked Crane Wintering at Napahai Nature Reserve, China. Zoological Research, 2008, 29(5): 553-560. doi: 10.3724/SP.J.1141.2008.05553
Citation: LIU Qiang, YANG Xiao-jun, ZHU Jian-guo, ZHAO Jian-lin, YU Hong-zhong. Flock of Black-necked Crane Wintering at Napahai Nature Reserve, China. Zoological Research, 2008, 29(5): 553-560. doi: 10.3724/SP.J.1141.2008.05553

Flock of Black-necked Crane Wintering at Napahai Nature Reserve, China

doi: 10.3724/SP.J.1141.2008.05553
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  • Corresponding author: YANG Xiao-jun,ZHU Jian-guo
  • Received Date: 2008-03-12
  • Rev Recd Date: 1900-01-01
  • Publish Date: 2008-10-22
  • From October 2004 to May 2005, flock size and composition of wintering black-necked cranes (Grus nigricollis) 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) 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.
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Flock of Black-necked Crane Wintering at Napahai Nature Reserve, China

doi: 10.3724/SP.J.1141.2008.05553
    Corresponding author: YANG Xiao-jun,ZHU Jian-guo

Abstract: From October 2004 to May 2005, flock size and composition of wintering black-necked cranes (Grus nigricollis) 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) 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.

LIU Qiang, YANG Xiao-jun, ZHU Jian-guo, ZHAO Jian-lin, YU Hong-zhong. Flock of Black-necked Crane Wintering at Napahai Nature Reserve, China. Zoological Research, 2008, 29(5): 553-560. doi: 10.3724/SP.J.1141.2008.05553
Citation: LIU Qiang, YANG Xiao-jun, ZHU Jian-guo, ZHAO Jian-lin, YU Hong-zhong. Flock of Black-necked Crane Wintering at Napahai Nature Reserve, China. Zoological Research, 2008, 29(5): 553-560. doi: 10.3724/SP.J.1141.2008.05553

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