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Vol. 76, No. 6, 2005
Issue release date: November–December 2005 (January 2006)

The Impact of Geophagy on Ranging Behaviour in Phayre’s Leaf Monkeys (Trachypithecus phayrei)

Pages G. · Lloyd E. · Suarez S.A.
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Abstract

Resource use is known to influence the ranging behaviour of primates, and this effect may be pronounced when the resource is uncommon in the environment. Here we investigate the effect of geophagy on the ranging behaviour of Phayre’s leaf monkeys (Trachypithecus phayrei) in the Phu Khieo Wildlife Sanctuary, Thailand. UTM coordinates were collected via GPS from the group centre every 30 min during all-day follows of one study group over a 4-month period. On days during which the group visited a distant saltlick (n = 3), the monkeys travelled significantly further (p < 0.001), significantly faster (p < 0.001) and with fewer stops compared to non-saltlick days (n = 61). Saltlick visits also increased the home range size from 73.7 ha to 93.4 ha. Increased daily path length, increased travel speed and consistent pace are necessary because of the distance from the saltlick to the regularly used portion of the home range, and these reflect the import- ance of soil consumption to the leaf monkeys.



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References

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    External Resources

  10. Izawa K (1993). Soil-eating by Alouatta and Ateles. International Journal of Primatology 14: 229–242.
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  14. McKey DB (1978). Soils, vegetation, and seed eating by black colobus monkeys. In The Ecology of Arboreal Folivores (Montgomery GG, ed.), pp 423–437. Washington, Smithsonian Institute Press.
  15. Oates JF (1987). Food distribution and foraging behavior. In Primate Societies (Smuts BB, Cheney DL, Seyfarth R, Wrangham RW, Struhsaker T, eds.), pp 197–207. Chicago, University of Chicago Press.
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