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Kenyon M.,Dao Tien Endangered Primate Species Center | Streicher U.,Endangered Asian Species Trust | Loung H.,Dao Tien Endangered Primate Species Center | Tran T.,Cat Tien National Park | And 4 more authors.
Endangered Species Research | Year: 2014

From 2009 to 2012 thirteen wild-born pygmy slow lorises Nycticebus pygmaeus (in this paper referred to as pygmy lorises), confiscated from illegal trade, were radio-collared and released into secondary forest in South Vietnam. Pygmy lorises were monitored until death, recapture, or loss of collar; the longest monitoring period was 73 d. The mean (±SD) distances between consecutive sleeping sites were recorded for 324 consecutive days and averaged 122 ± 108.0 m. Mean distances between sleeping sites for males and females were similar at 110.7 ± 92.6 m for males and 128.8 ± 116.7 m for females, with the greatest distance covered by a female (793 m). Mean height of the sleeping sites was 8.54 ± 4.46 m (n = 60), in trees with a mean diameter at breast height of 75.2 ± 58.4 cm (n = 225). Mean height of the trees where lorises slept was 20.2 ± 9.0 m (n = 230). The pygmy lorises slept mostly in the >8 m band, the area of highest tree connectivity. Of the pygmy lorises studied 38% (5/13) were found dead, 7% (1/13) were returned to captivity due to severe loss of condition and for 23% (3/13) the outcome is unknown due to early collar loss. Causes of death included hyperthermia and natural predation. The remaining 30% (4/13), 2 males and 2 females, were in good condition when last tracked before premature collar drop-off, up to 73 d after release. From this limited data set, a 'soft' release, wet season release and consideration of predator density at the release site are recommendations for increasing chances of survival. © Inter-Research 2014.

Kenyon M.,Endangered Asian Species Trust | Kenyon M.,Dao Tien Endangered Primate Species Center | Cronin A.,Endangered Asian Species Trust | Jai-Chyi Pei K.,National Pingtung University of Science and Technology | Van Thanh T.,Cat Tien National Park
International Zoo Yearbook | Year: 2012

The Endangered Asian Species Trust, founded by Monkey World - Ape Rescue Centre, United Kingdom, organizes the rehabilitation and release of threatened South Vietnamese primates at the new Dao Tien Endangered Primate Species Centre in Cat Tien National Park Vietnam. This work supports the Vietnamese Government to enforce laws on stopping the trade in threatened primates, by providing a place for confiscated animals and facilitating the return to the wild of suitable candidates, boosting wild populations and working towards founding new populations in areas where they have become extinct, such as in regenerating lowland forests. © 2011 The Authors. International Zoo Yearbook © 2011 The Zoological Society of London.

Thinh V.N.,German Primate Center | Rawson B.,Conservation International Greater Mekong Region | Hallam C.,Wildlife Conservation Society | Kenyon M.,Endangered Asian Species Trust | And 3 more authors.
American Journal of Primatology | Year: 2010

Crested gibbons, genus Nomascus, are endemic to the Indochinese bioregion and occur only in Vietnam, Laos, Cambodia, and southern China. However, knowledge about the number of species to be recognized and their exact geographical distributions is still limited. To further elucidate the evolutionary history of crested gibbon species and to settle their distribution ranges, we analyzed the complete mitochondrial cytochrome b gene from 79 crested gibbon individuals from known locations. Based on our findings, crested gibbons should be classified into seven species. Within N. concolor, we recognize two subspecies, N. concolor concolor and N. concolor lu. Phylogenetic reconstructions indicate that the northernmost species, N. hainanus, N. nasutus, and N. concolor branched off first, suggesting that the genus originated in the north and successively migrated to the south. The most recent splits within Nomascus occurred between N. leucogenys and N. siki, and between Nomascus sp. and N. gabriellae. Based on our data, the currently postulated distributions of the latter four species have to be revised. Our study shows that molecular methods are a useful tool to elucidate phylogenetic relationships among crested gibbons and to determine species boundaries. Am. J. Primatol. 72:1047-1054, 2010. © 2010 Wiley-Liss, Inc.

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