Group size effects on foraging and vigilance in migratory Tibetan antelope

  title={Group size effects on foraging and vigilance in migratory Tibetan antelope},
  author={Xinming Lian and Tong-zuo Zhang and Yifan Cao and Jianping Su and Simon J. Thirgood},
  journal={Behavioural Processes},

Group-Size Effect on Vigilance and Foraging in a Predator-Free Population of Feral Goats (Capra hircus) on the Isle of Rum, NW Scotland

The results imply that the benefits for foraging obtained from the reduced vigilance level in larger groups may be constrained or offset by increased interaction (or competition) within larger groups even in a population that faces negligible predation risk.

The group size effect and synchronization of vigilance in the Tibetan wild ass

There was a positive correlation between group members’ behaviors, indicating that Tibetan wild asses tend to synchronize their vigilance, and many models of vigilance assume that group members scan independently of one another.

Factors Affecting Group Size and Vigilance Behaviour of Maasai Giraffe (Giraffa camelopardalis tippelskirchi) on the Serengeti-Ngorongoro Ecosystem, Tanzania

This study investigated the factors affecting different group sizes of Maasai giraffe (Giraffa camelopardalis tippelskirchi) in the Serengeti-Ngorongoro ecosystem. The study was motivated to test the

Activity Budgets of Impala (Aepyceros melampus) in Closed Environments: The Mukuvisi Woodland Experience, Zimbabwe

It is concluded that provisioning and attraction may have reduced the influence of seasonality on the proportion of time spent on different activity states by impala social groups under closed environments.

Inter- and intraspecific vigilance patterns of two sympatric Tibetan ungulates

It is suggested that body mass and group size play an important role in shaping the vigilance of these two rare Tibetan ungulates.

Influences of sex, group size, and spatial position on vigilance behavior of Przewalski’s gazelles

The results suggest that there may be sexual difference in the function and targets of vigilance behavior of Przewalski’s gazelles, which warrants more investigation, with incorporation of within-group spatial position, to better understand the mechanism underlying the group size effect and edge effect.

Road proximity and traffic flow perceived as potential predation risks: evidence from the Tibetan antelope in the Kekexili National Nature Reserve, China

Context. The risk-disturbance hypothesis predicts that animals exhibit risk-avoidance behaviours when exposed to human disturbance because they perceive the disturbance as a predatory threat. Aims.

Behavioural Indicators of Intra- and Inter-Specific Competition: Sheep Co-Grazing with Guanaco in the Patagonian Steppe

Investigation of behavioural changes of domestic sheep in Chilean Patagonia in response to herd size, food availability, and the presence of a wild competitor, the guanaco, suggested that the observed behavioural changes are more likely due to intraspecific competition rather than interspecific competition.



Factors affecting vigilance in springbok: importance of vegetative cover, location in herd, and herd size

Abstract  Vigilance in vertebrates is often inversely related to group size. We present evidence that distance to bushes and location within the herd are also critical factors in vigilance in

Changes in Vigilance with Group Size under Scramble Competition

The role of resource availability on vigilance patterns is explored and it is indicated that when resources are limited, a reduction in vigilance may allow individuals to allocate more time to foraging and so obtain a greater share of the re-foraging time.

Migratory and calving behavior of Tibetan antelope population

A migratory population of female Tibetan antelope or chiru was studied on its calving ground in the western Kunlun Mountains, Xinjiang in June-July 2005. It was estimated that 4 000-4 500 females

Vigilance Behaviour in African Ungulates: The Role of Predation Pressure

It is suggested that predation pressure is the principal influence on vigilance behaviour in ungulates and even very low risk of predation appears to contribute to vigilance.


  • M. Elgar
  • Environmental Science
    Biological reviews of the Cambridge Philosophical Society
  • 1989
Most of the studies fail to adequately demonstrate an unambiguous relationship between vigilance behaviour and group size, but many studies reveal interesting features of the relationship between Vigilance and Group size that should provide fruitful avenues for future research.

Vigilance and group size in impala (Aepyceros melampus Lichtenstein): a study in Nairobi National Park, Kenya

One of the advantages of living in groups is that individuals may need to be less vigilant, allowing them more time for other important activities, such as foraging. This relationship between group

Diurnal behavioral time budgets and activity rhythm of the female Tibetan antelope (Pantholops hodgsoni) in summer

During June to September in 2003,2004 and 2005, the ethogram (including foraging, vigilance, resting, moving and others) of the Tibetan antelope (Pantholops hodgsoni) in summer was formulated and

Vigilance in African Mammals: Differences Among Mothers, Other Females, and Males

It is suggested that in 1993 herd size was above a threshold where increases in group size can lead to further decreases in vigilance, and animals on the edge of herds devoted more time to vigilance than intermediate or central animals.

Food Habits and Competitive Relationships of the Bandfin Shiner in Halawakee Creek, Alabama

The bandfin shiner (Notropis zonistius) showed highest feeding activity between 0300 and 0600 hr and 1400 and 1700 hr in Halawakee Creek, and the diet was most diverse in summer and winter and least in spring.