Biodiv Sci ›› 1997, Vol. 05 ›› Issue (2): 84-89.DOI: 10.17520/biods.1997014

• 论文 •     Next Articles

Population ecology and endangered categories evaluation of the Black-necked crane (Grus nigricollus)

Li Laixin   

  1. Northwest Plateau Institute of Biology ,Academia Sinica ,Xining 810001
  • Received:1995-12-20 Revised:1996-08-13 Online:1997-05-20 Published:1997-05-20

Abstract:

According to field investigation,the population of the black-necked crane (Grus nigricollus )is determined of 5000~6000 individuals distributed mainly through Qinghai-Xizang (Tibet) Plateau and Yunnan-Guizhou Plateau.Its extent of occurrence is more than 22×105 Km2 and area of occupancy is more than 5400 Km2.Breeding area has been found in northern and west Tibet Plateau and wintering area in the middle valley of Tsangpo,parts of Yunnan-Guizhou Plateau and southern slope of Himalaya.The migratory routes are over the southeast Tibet Plateau.In wintering area,the Black-necked crane acts with family,same species group and mixed species group such as Common crane (Grus grus) and Bar-headed geese (Anser indicus).In breeding area,the Black-necked crane are separated  into no-breeding group and breeding pairs.Territory occupied by breeding pair may be a key to breeding successfully.This species is evaluated as a vulnerable (VU) species according to the endangred categories of IUCN (1994).

Key words: mangrove creek, fish, seasonal numerical distribution, similarity, species diversity