| Records |
| Author |
Namgail, T. |
Title  |
Vigilance behaviour of the Tibetan argali Ovis ammon hodgsoni in the Indian Trans-Himalaya |
Type |
Journal Article |
| Year |
2007 |
Publication |
Acta Zoologica Sinica |
Abbreviated Journal |
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| Volume |
53 |
Issue |
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Pages |
195-200 |
| Keywords |
Tibertan argali, Ovis ammon, vigilance, dilution effect, Ladakh, Trans-Himalaya |
| Abstract |
An inverse relationship between individual vigilance level and group size is widely reported in many behavioral studies on animals across several taxa. It is generally held that such a relationship is due to a reduced probability of an individual being killed in larger groups. in the present investigation, I studied the vigilance behavior of the endangered Tibetan argali Ovis ammon hodgsoni in relation to group size and escape terrain. I hypothesized that an individual argali has a higher vigilance level in smaller groups and in habitats closer to cliffs than individuals living in larger groups and open areas (escape terrain). The results show that the vigilance of argali decreased with increasing group size, but there was no effect of escape terrain on its vigilance behavior. There were significant differences between age-sex groups: male, female and yearling in their time budgets. Females, compared to males and yearlings, spent more time being vigilant. They also foraged more and moved less than males. It is suggested that vigilance is an important anti-predator behavior amongst argali sheep. |
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English |
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Abstract also available in Chinese |
Approved |
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| Call Number |
SLN @ rana @ |
Serial |
1310 |
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| Author |
Namgail, T. |
| Title |
Winter birds of the Gya-Miru Wildlife Sanctuary, Ladakh, Jammu and Kashmir, India |
Type |
Journal Article |
| Year |
2005 |
Publication |
Indian Birds |
Abbreviated Journal |
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| Volume |
1 |
Issue |
2 |
Pages |
26-28 |
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| Abstract |
A survey of the winter birds of the Gya-Miru Wildlife Sanctuary in the Trans-Himalayan region of Ladakh, India was carried out between December 2002 and March 2003. 30 species were recorded, constituting 60% of the total resident species in Ladakh excluding Nubra Valley, and 10% of the total birds recorded in Ladakh (11% of the post-1960 records). 29 species (97%) of the birds recorded breed in Ladakh, while one, Mallard Anas platyrhynchos is a passage migrant. The most noteworthy sightings were four species of pheasants (Phasianidae) and two of owls (Strigidae). A preliminary assessment of the potential threats to the birds in the reserve was made. This is the first avifaunal survey of the reserve, and has implications for assessing the importance of the area for bird protection. |
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| Notes |
March-April 2005 |
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SLN @ rana @ |
Serial |
1311 |
| Permanent link to this record |
