Dakrong Nature Reserve
Asia > Vietnam > Dakrong Nature Reserve
Français | Português | Español | Bahasa Indonesia | Melayu
Summary
- Northern yellow-cheeked crested gibbons (Nomascus annamensis) are present in Dakrong Nature Reserve.
- The population size is unknown.
- The gibbon population trend is unknown.
- The site has a total size of 376.18 km².
- Key threats to gibbons are illegal logging and exploitation of non-timber forest products.
- Conservation activities are not documented.
Site characteristics
Located in Quang Tri Province, in the center part of the Annamite Mountain Range, Vietnam, the Dakrong Nature Reserve was established in 2001(Vu & Doherty 2021). Approximately half the area is covered by rich and medium evergreen forest; the rest is covered by poor, regrowth forest, plantations, or bare land. The terrain of the reserve consists of low and medium hills, with the highest peak reaching 1410 m above sea level (Vu & Doherty 2021).
Table 1. Basic site information for Dakrong Nature Reserve
| Species | 'Nomascus annamensis |
| Area | 376.18 km² |
| Coordinates | Lat: 16.625414 , Lon: 106.893379 |
| Type of site | Protected area (Nature Reserve) |
| Habitat types | Subtropical/tropical moist lowland forest, Subtropical/tropical heavily degraded former forest |
| Type of governance |
IUCN habitat categories Site designations
Ape status
The northern yellow-cheeked crested gibbon only occurs in the Central Annamite mountain range along the borders of Vietnam and Laos, and Vietnam and Cambodia. No complete survey for the species has been conducted (Vu & Doherty 2021). A survey was conducted in the reserve in 2019 using passive acoustic monitoring. Gibbon calls were detected in 39 out of 95 recording sites (Vu & Doherty 2021). Assuming a 600 m detection distance, the model-averaged occurrence probability for the nature reserve was 0.44 (SE=0.06). The area of rich and medium evergreen forests within a km of the recording posts was the most important predictor of occurrence (positively correlated). Detection probability was estimated to be 0.52 (SE=0.04) per day (Vu & Doherty 2021).
Table 2. Ape population estimates reported for Dakrong Nature Reserve
| Species | Year | Total number indiv. (95% CI) | Total number groups (95% CI) | Density [groups/km²] (95% CI) | Area | Method | Source | Comments | A.P.E.S. database ID | NA | NA |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Nomascus annamensis | 2019 | Dakrong Nature Reserve | Passive acoustic monitoring | Vu & Doherty 2021 |
Threats
Most hunters active in the region are thought to come from other provinces, more than 100 km away from the reserve. Similar to other studies, a 2021 study showed a higher occupancy of gibbons in high vs low quality forest (Vu & Doherty 2021). Generally, northern yellow‐cheeked gibbon populations have dramatically decreased in Vietnam due to hunting, habitat loss, and the wildlife trade (Vu & Doherty 2021). The site has been selectively logged in the past, and timber and NTFP exploitation still occurs in the reserve. In addition, local communities live in villages near the nature reserve boundary (Vu & Doherty 2021).
Table 3. Threats to apes reported for Dakrong Nature Reserve
| Category | Specific threats | Threat level | Description | Year of threat |
|---|---|---|---|---|
| 10 Geological events | Absent | |||
| 12 Other threat | Absent | |||
| 9 Pollution | 9.2 Industrial & military effluents | Medium (30-70% of population affected) | Forest cover has been reduced by the spraying of chemical defoliants during the Second Indochina War (BirdLife International 2022). | 1955-1975 |
| 5 Biological resource use | 5.1 Hunting & collecting terrestrial animals | Present (unknown severity) | Signs of wildlife hunting and trappings are recorded in the nature reserve (Vu & Doherty 2021). | Ongoing (2021) |
| 5 Biological resource use | 5.2 Gathering terrestrial plants | Present (unknown severity) | Illegal exploitation of non-timber forest products (Vu & Doherty 2021). | Ongoing (2021) |
| 5 Biological resource use | 5.3 Logging & wood harvesting | Present (unknown severity) | Illegal timber exploitation, in the past and ongoing (Vu & Doherty 2021). | Ongoing (2021) |
| 1 Residential & commercial development | Unknown | |||
| 2 Agriculture & aquaculture | Unknown | |||
| 3 Energy production & mining | Unknown | |||
| 4 Transportation & service corridors | Unknown | |||
| 6 Human intrusions & disturbance | Unknown | |||
| 7 Natural system modifications | Unknown | |||
| 8 Invasive & other problematic species, genes & diseases | Unknown | |||
| 11 Climate change & severe weather | Unknown |
Conservation activities
Challenges
Table 5. Challenges reported for Dakrong Nature Reserve
| Challenges | Specific challenges | Source | Year(s) |
|---|---|---|---|
| Not reported |
Enablers
Table 6. Enablers reported for Dakrong Nature Reserve
| Enablers | Specific enablers | Source | Year(s) |
|---|---|---|---|
| 1 Site management | |||
| 2 Resources and capacity | |||
| 3 Engaged community | |||
| 4 Institutional support | |||
| 5 Ecological context | |||
| 6 Safety and stability |
Research activities
Documented behaviours
Table 7. Behaviours documented for Dakrong Nature Reserve
| Behavior | Source |
|---|---|
| Not reported |
Exposure to climate change impacts
External links
Relevant datasets
References
BirdLife International (2022) Important Bird Areas factsheet: Dakrong. Downloaded from http://www.birdlife.org on 31/01/2022.
Vu, T. T., & Doherty, P. F. (2021). Using bioacoustics to monitor gibbons. Biodiversity and Conservation, 30(4), 1189-1198. https://link.springer.com/article/10.1007/s10531-021-02139-1
Page created by: A.P.E.S. Wiki team Date: NA