Daily Movement and Activity of Female and Juvenile Himalayan Thar (hemitragus Jemlahicus) in the Eastern Southern Alps, New Zealand
نویسندگان
چکیده
About 30 female and juvenile Himalayan thar (Hemitragus jemlahicus) were observed over 2 years on a 200 ha study area. At dawn, thar were at low altitudes and most were feeding. They ascended during the morning to spend the middle of the day resting at high altitudes. In the afternoon they descended again, with increasing feeding activity, to reach low altitudes at dusk. The vertical movement was 450 m in summer and 150 m in winter. The proportion of the day spent feeding was highest in November-February and lowest in AugustSeptember. Resting behaviour was more frequent in March-May and August-October than at other times. The proportion of the day spent standing increased threefold during June-July. The feeding pressure during daylight on four vegetation associations showed that tall snow tussock grasslands at high altitudes were likely to be the most susceptible to modification. Lower altitude associations, such as short tussock grasslands and matagouri scrub, received more intense feeding pressure during spring, but were rarely used in winter.
منابع مشابه
An Improved Technique for Indexing Abundance of Himalayan Thar
The Himalayan thar (Hemitragus jemlahicus Smith) is an introduced ungulate pest of the alpine zone in New Zealand’s Southern Alps. Considerable money is spent attempting to mitigate their effects on indigenous flora (Tustin, 1990). Current management focuses on maintaining thar densities below specified densities by a combination of recreational, commercial, and government-funded hunting (Depar...
متن کاملUse of a domestic Korean black goat (Capra hircus coreanae) with its chest crayon-harnessed in detecting estrus of Himalayan tahrs (Hemitragus jemlahicus)
The reliability of a Korean black goat (Capra hircus coreanae) to detect estrus in Himalayan tahrs (Hemitragus jemlahicus) for an artificial breeding program was investigated. Estrus in six female Himalayan tahrs was synchronized using fluorogestone acetate (FGA) sponges. Thirteen days later, 200 IU of PMSG and 100 IU of hCG were injected before removing the sponges and simultaneously injecting...
متن کاملA Reappraisal of the Distribution and Dispersal of Female Himalayan Thar in New Zealand
The breeding ranges of thar are described as they were in 1976 and 1984 and compared with previously described ranges in 1936, 1946, 1956 and 1966. Commercial hunting during 1972-1976 harvested about 32000 thar and along with habitat limits in some areas this slowed the rate of dispersal into new areas and eliminated thar from the periphery of their range in other areas. The rate of thar disper...
متن کاملA case for multi-species management of sympatric herbivore pest impacts in the central Southern Alps, New Zealand
Five herbivorous introduced mammals are sympatric in the central Southern Alps. All of these species have the potential to affect conservation values, yet the Department of Conservation at present monitors and mitigates the impacts of only one. We outline ecological arguments for multi-species management of sympatric herbivore pest impacts and use the two-species system of sympatric thar and ch...
متن کاملA frost “buzzsaw” mechanism for erosion of the eastern Southern Alps, New Zealand
Article history: In the Southern Alps, New Z Received 2 April 2008 Received in revised form 21 December 2008 Accepted 22 December 2008 Available online 3 January 2009
متن کامل