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ba_4Via satellite telemetry (Argos satellite system), we recorded the movements of a Lyle?s flying fox in Singburi Province, Central Thailand. The apparatus was attached to a mature male bat at Wat Kaochang, one of the biggest roosting sites of Lyle?s fruit bat in the province. Movement of Lyle?s fruits bat was examined from March 12 through April 1, 2009. The bat seemed to change its roost from Wat Kaochan to some roosts in Chainat Province by the captive stress. There was no report of the roosts of Lyle?s flying fox in the province, so further investigation about its habitat in central Thailand is required. On the other hand, the bat sometimes fly over provinces, but this trip was usually occurred within a day, and the bat went back to Chainat Province again. This study showed wide range of movement of Lyle?s flying fox in central Thailand.

Key word: daily movement, fruit bat, satellite telemetry, roosting site





The Lyle?s flying fox (Pteropus lylei) was firstly described in 1861 as Pteropus edwardsi in Cambodia (Gray, 1861), and received its current name in 1908 (Andersen, 1908). In adults, body weight ranges from 390 g to 480 g, and forearm length (FA), measured from the outside of the elbow to the outside of the wrist in the bent wind, ranges from 145 mm to 160 mm (Francis, 2008). Total length of skull (LS) is 61 mm to 66 mm. It resembles the Indian flying fox (Pteropus giganteus) (FA; 164-177, LS; 71-76), but is much smaller. Lyle?s flying fox has a dark brown

or black back and wings. Head and mantle are yellow- or light-brown, contrasting with the color on the back. The muzzle is dark. The color on the lower body varies between individuals from yellow-brown to deeply dark brown. Its breast and belly color are blackish or seal-brown as in the Large flying fox (Pteropus vampyrus), but occasionally bright-colored as in Pteropus giganteus. All known flying foxes are frugivorous and/or herbivorous. In Lyle?s flying foxes the average amount of food ingested per day is 217.5 g, while the amount of feces produced is only 18.4 g (Boonneung , 1977).

In South-East Asia, the Lyle?s flying fox is found in Thailand, Cambodia, Vietnam, and Malaysia (Olival et al, 2007; Francis, 2008). Among where, distribution of it in Thailand has been well-documented (Boonkird & Wanghongsa, 2004; Hillman, 2005). Lyle?s flying foxes usually roost in temples, in the middle of towns and cities. In each roost, bats between 389 and 11,010 have been counted from 2001 to 2003 around Bangkok. According to the monks living in these temples, the bats leave in the evening (only few bats stay in the temple during the night) and return in the early morning. This behavior is known for over 30 years in most temples. Bats depart in small groups of some dozens up to several hundreds to look for food. If they could not find foods in a place, they never come back again. In areas with a lot of food, the bats may aggregate in large numbers. Sometimes, bats go out to look for food over provinces of Thailand.

These long-term observations by monks provide useful information, even though they have yet to be confirmed, scientifically. In this study, the movements of a Lyle?s flying fox were tracked in Singburi province in Thailand using Argos satellite telemetry system, to reveal details of its behavior.

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