Trachypithecus delacouri (Primates: Cercopithecidae)

Harding, Lee E.

doi:10.1644/880.1

Cited by 7 publications

(2 citation statements)

References 41 publications

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“…Compared to previous studies, group sizes observed at our study site in 2020 were much lower than those recorded in the Quang Binh Province, Vietnam (15 or more; see [31]), but similar to the size of langur groups observed by [32] (mean 7.3), by [31] (mean 8.2) and by [33]. The closely related Trachypithecus delacouri is territorial as probably also the Laotian langur is, and usually lives in single-male-multifemale groups of 5-30 individuals [34]. However, even subtle differences in survey technique may produce different results.…”

Section: Discussionsupporting

confidence: 74%

Ecology and Conservation of the Laotian langur Trachypithecus laotum in a Protected Area of Laos (Southeast Asia)

et al. 2021

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Terrestrial species from the Lao People’s Democratic Republic (PDR) are under high threat due to deforestation and overhunting. Previous studies have even defined these forests as subjected to an “empty forest syndrome”, a condition in which forests that are apparently well preserved are instead almost deprived of vertebrate faunas due to extreme exploitation by local communities. Forest specialists, including several primates, are among the most threatened species in the country. The Laotian langur (Trachypithecus laotum) is endemic to Lao PDR, is listed as Endangered by the IUCN Red List, and it is one of the least studied species in the region. A survey on the local distribution, life history and conservation status of the Laotian langur was carried out in Phou Hin Poun National Protected Area, Khammouane Province of Lao PDR. The survey consisted of an initial phase with interviews to select key informants on the Laotian langur and the other primate species of the area. Then, a phase of field surveys along forest transects, totaling 64.1 km of 21 transects, yielded a record of 35 individuals in 9 groups. The highest encounter/detection rate of the Laotian langur was 1 group per km at one sector of the park. In contrast, it was much lower (0.18–0.34 groups/km) in the rest of the protected area. The group sizes were much lower than those observed in the same area between 1994 and 2010, thus suggesting a decline in the population size of langurs. This decline may be linked to habitat loss (timber extraction and mining). Still, also overhunting, as signs of poaching were observed during our field surveys. This was also supported by the reports of our interviewees. Laotian langurs were observed to be sympatric and interact while foraging with the Assamese macaque (Macaca assamensis). In the cases of sympatric occurrence between the two species, we observed that subtle mechanisms of niche partitioning may occur to reduce interspecific competition for food. Further research on the population and ecology of this endangered langur should be conducted to understand the species and aid its conservation.

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Section: Discussionsupporting

confidence: 74%

Ecology and Conservation of the Laotian langur Trachypithecus laotum in a Protected Area of Laos (Southeast Asia)

et al. 2021

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“…Fewer than 200 remain. When last surveyed, just three populations were found, of which only one is thought to be viable (Harding, 2011). A decade ago, there were 19 known populations.…”

Section: White Rhinoceros Killed In South Africamentioning

confidence: 99%

EDITORIAL : Wildlife Poaching Increasing

Harding¹

2013

TAPRO

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After decades of endangered species protection and conservation success, poachers are staging a come–back. Most people in Europe and North America just don’t believe that rhinoceros horn, monkey meat, tiger penis or bear bile have any curative or health properties, but millions of people in East Asia and Southeast Asia believe otherwise. This cultural predilection is driving extinction. As repugnant as it is to those living outside the range of non–human primates, monkey meat provides a much–needed source of protein in some circumstances—but not enough to justify their extinction. There is no such nutritional excuse for poaching tigers, bears or rhinoceros. Since the start of 2008, at least 1800 white rhinoceroses and a few of the rarer black rhinoceroses have been killed in South Africa for their horns, most smuggled into Vietnam and China.

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