ESJ56 一般講演（口頭発表） N1-08
S. Ganzorig (Hokudai, Vetmed), H. Buho (Rakuno Gakuen), Z. Jiang (WMO), C. Liu (Inst. Zoology, Shaanxi, China)
The spatial and temporal patterns of the endangered Tibetan antelope (Pantholops hodgsonii ) have been studied using satellite-based ARGOS platform transmitter terminal tracking data. The data were obtained from the satellite tracking of two female Tibetan antelopes that were collared with satellite transmitters and have been tracked from August 2007 to October 2008. Analysis of the locality data obtained is show that both captured antelopes were migrant individuals, they shared the same calving ground in surrounds of the lake Huiten, but different wintering pastures. Each antelope individual covered 250 to 300 km from the wintering to summer pastures. Seasonal migration cycle was about 3 months, of these 27 to 30 days to reach the calving ground; 8 to 20 days to stay over there; 36 to 40 days was return way to the core area. Both chiru at least two times crossed both Qinghai-Tibetan railway (QTR) and Golmud-Lhasa highway (GLH), and reached calving ground (118 to 120 km from there) in 8 days. However, during forward and return migration the antelopes have spent 20 to 40 days in that area, probably looking for the passages and waiting. So far, we suppose that QTR and GLH became bottleneck factor for the migration of the chiru and do seriously delay its movement to and from calving area.