云贵高原黑颈鹤的种群数量和分布

云贵高原有黑颈鹤的两个越冬区：(1）云南西部；(2)云南东北部和贵州西北部。这两个地区的黑颈鹤数量占全球种群的1／4至1／3。国际鹤类基金会与云南省林业厅于2001／2002年冬季在云贵高原联合对黑颈鹤进行了一次同步计数，本次调查覆盖了17个已知或潜在的黑颈鹤越冬地点，其中15个地点有黑颈鹤分布。在2002年1月18日和19日，分别记录到3261和3182只黑颈鹤。本调查还统计了灰鹤、斑头雁和赤麻鸭，数量分别为：灰鹤804和1158只；斑头雁1759和2978只；赤麻鸭3442和5444只。与1991／1992年冬季进行的调查结果相比，黑颈鹤在这一地区的数量增加了90％以上。

Population Numbers and Distribution of Black-necked Cranes (Grus nigricollis) in the Yungui Gaoyuan Plateau

Yungui Gaoyuan Plateau contains two wintering regions for Black-necked cranes Grus nigricollis:(1)western Yunnan,and (2) northeastern Yunnan and northwestern Guizhou.The two regions support 1/4 to 1/3 of the world's populatin of Black-necked cranes. In the winter of 2001/2002,the International Crane Foundation collaborated with the Yunnan Forestry Bureau to conduct a survey of Black-necked cranes on the Yungui Gaoyuan Plateau.17 known or potential wintering areas of Black-necked cranes were surveyed.In total 3?261 and 3?182 Black-necked cranes,804 and 1?158 Common cranes Grus grus,1?759 and 2?978 Bar-headed geese Anser indicus,and 3?442 and 5?444 Ruddy shelducks Tadorna ferruginea were recorded on the 18?th and 19?th of January 2002 respectively.Black-necked crane numbers have increased by more than 90% over the past decade inthis region.