Dieng Plateau: Difference between revisions
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= Site characteristics = | = Site characteristics = | ||
The site consists of a part of a fragmented natural forest in the Dieng Plateau, Central Java province, Indonesia. Dieng is known as a volcanic complex with numerous craters (Widyastuti et al. 2020). The site, which was part of a survey, is located in the northern part of the mountains. The area has hilly terrain, complex riverine, valley, and ridges (Widyastuti et al. 2020). The natural forest in the area is home to a variety of flora and fauna, especially for all primates of Java. Those are ''Macaca fascicularis'', ''Trachypitechus auratus'', ''Presbytis fredericae'', ''Nicticebus javanicus'' and ''Hylobates moloch'' (Widyastuti et al. 2020). | The site consists of a part of a fragmented natural forest in the Dieng Plateau, Central Java province, Indonesia. Dieng is known as a volcanic complex with numerous craters ([[#R00460|Widyastuti et al. 2020]]). The site, which was part of a survey, is located in the northern part of the mountains. The area has hilly terrain, complex riverine, valley, and ridges ([[#R00460|Widyastuti et al. 2020]]). The natural forest in the area is home to a variety of flora and fauna, especially for all primates of Java. Those are ''Macaca fascicularis'', ''Trachypitechus auratus'', ''Presbytis fredericae'', ''Nicticebus javanicus'' and ''Hylobates moloch'' ([[#R00460|Widyastuti et al. 2020]]). | ||
'''Table 1. Basic site information for Dieng Plateau''' | '''Table 1. Basic site information for Dieng Plateau''' | ||
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= Ape status = | = Ape status = | ||
A 2018 survey aimed to identify the habitat suitability model (HSM) for Javan gibbons in the Dieng highland and the most influencing biophysical variables (Widyastuti et al. 2020). A total of 305 occurrence data recorded in extensive field surveys and 11 variables were maintained for HSM in presence-only machine learning, maximum entropy (MaxEnt). Suitable gibbon habitats were predicted as 81.286 km2 in the surveyed area (Widyastuti et al. 2020). Relatively large areas of suitable habitat are located in Sokokembang, Linggoasri-Mendolo, and western of Kembanglangit. The most important variables were natural forest, elevation, distance to cropland and land surface temperature (Widyastuti et al. 2020). | A 2018 survey aimed to identify the habitat suitability model (HSM) for Javan gibbons in the Dieng highland and the most influencing biophysical variables ([[#R00460|Widyastuti et al. 2020]]). A total of 305 occurrence data recorded in extensive field surveys and 11 variables were maintained for HSM in presence-only machine learning, maximum entropy (MaxEnt). Suitable gibbon habitats were predicted as 81.286 km2 in the surveyed area ([[#R00460|Widyastuti et al. 2020]]). Relatively large areas of suitable habitat are located in Sokokembang, Linggoasri-Mendolo, and western of Kembanglangit. The most important variables were natural forest, elevation, distance to cropland and land surface temperature ([[#R00460|Widyastuti et al. 2020]]). | ||
'''Table 2. Ape population estimates reported for Dieng Plateau''' | '''Table 2. Ape population estimates reported for Dieng Plateau''' | ||
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|Dieng Plateau (175 km²) | |Dieng Plateau (175 km²) | ||
|Line transects | |Line transects | ||
|Widyastuti et al. 2020 | |[[#R00460|Widyastuti et al. 2020]] | ||
|In addition to line transects, faecal samples, vocalisations, and sightings information from trusted villagers were considered as indirect evidence to obtain a robust occurrence data | |In addition to line transects, faecal samples, vocalisations, and sightings information from trusted villagers were considered as indirect evidence to obtain a robust occurrence data | ||
| | | | ||
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|2.1 Annual & perennial non-timber crops | |2.1 Annual & perennial non-timber crops | ||
|Present (unknown severity) | |Present (unknown severity) | ||
|Several relatively flat areas converted into cropland, such as dry crop and rice field (Widyastuti et al. 2020). | |Several relatively flat areas converted into cropland, such as dry crop and rice field ([[#R00460|Widyastuti et al. 2020]]). | ||
|Ongoing (2020) | |Ongoing (2020) | ||
|- | |- | ||
| Line 91: | Line 91: | ||
|2.2 Wood & pulp plantations | |2.2 Wood & pulp plantations | ||
|Present (unknown severity) | |Present (unknown severity) | ||
|Plantation forest next to natural forest, such as pine tree, rubber tree, and dammar tree (Widyastuti et al. 2020). | |Plantation forest next to natural forest, such as pine tree, rubber tree, and dammar tree ([[#R00460|Widyastuti et al. 2020]]). | ||
|Ongoing (2020) | |Ongoing (2020) | ||
|- | |- | ||
| Line 97: | Line 97: | ||
|4.1 Roads & railroads | |4.1 Roads & railroads | ||
|Present (unknown severity) | |Present (unknown severity) | ||
|Roads built to support development of tourist parks (Widyastuti et al. 2020). | |Roads built to support development of tourist parks ([[#R00460|Widyastuti et al. 2020]]). | ||
|Ongoing (2020) | |Ongoing (2020) | ||
|- | |- | ||
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|5.2 Gathering terrestrial plants | |5.2 Gathering terrestrial plants | ||
|Present (unknown severity) | |Present (unknown severity) | ||
|Collection of NTFP such as honey (Widyastuti et al. 2020). | |Collection of NTFP such as honey ([[#R00460|Widyastuti et al. 2020]]). | ||
|Ongoing (2020) | |Ongoing (2020) | ||
|- | |- | ||
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|5.3 Logging & wood harvesting | |5.3 Logging & wood harvesting | ||
|High (more than 70% of population affected) | |High (more than 70% of population affected) | ||
|Most of the natural forest patches are secondary forest due to logging in the past (Widyastuti et al. 2020). | |Most of the natural forest patches are secondary forest due to logging in the past ([[#R00460|Widyastuti et al. 2020]]). | ||
|Ongoing (2020) | |Ongoing (2020) | ||
|} | |} | ||
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= Conservation activities = | = Conservation activities = | ||
The forested areas at the site are managed by Perum Perhutani (Indonesia state-owned forestry enterprise) which are mainly responsible for forest production (Widyastuti et al. 2020). | The forested areas at the site are managed by Perum Perhutani (Indonesia state-owned forestry enterprise) which are mainly responsible for forest production ([[#R00460|Widyastuti et al. 2020]]). | ||
= Challenges = | = Challenges = | ||
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= References = | = References = | ||
Widyastuti, S., Perwitasari-Farajallah, D., Prasetyo, L. B., Iskandar, E., & Setiawan, A. (2020 | <span id="R00460"></span>Widyastuti, S., Perwitasari-Farajallah, D., Prasetyo, L. B., Iskandar, E., & Setiawan, A. (2020). Maxent modelling of habitat suitability for the endangered javan gibbon (Hylobates moloch) in less-protected Dieng Mountains, Central Java. ''IOP Conference Series: Earth and Environmental Science'', 457(1), 012014. [https://doi.org/10.1088/1755-1315/457/1/012014 doi:10.1088/1755-1315/457/1/012014] | ||
'''Page created by: '''APES Atlas Team''' Date:''' 2022-01-28 | '''Page created by: '''APES Atlas Team''' Date:''' 2022-01-28 | ||
Latest revision as of 16:27, 12 October 2026
Asia > Indonesia > Dieng Plateau
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Summary
- Javan gibbons (Hylobates moloch) are present in the Dieng Plateau.
- The population size is unknown.
- The population trend is unknown.
- The survey site has a total size of 175 km².
- Key threats to gibbons are forest fragmentation due to logging and agriculture, and collection of NTFPs.
- Conservation activities are not documented.
Site characteristics
The site consists of a part of a fragmented natural forest in the Dieng Plateau, Central Java province, Indonesia. Dieng is known as a volcanic complex with numerous craters (Widyastuti et al. 2020). The site, which was part of a survey, is located in the northern part of the mountains. The area has hilly terrain, complex riverine, valley, and ridges (Widyastuti et al. 2020). The natural forest in the area is home to a variety of flora and fauna, especially for all primates of Java. Those are Macaca fascicularis, Trachypitechus auratus, Presbytis fredericae, Nicticebus javanicus and Hylobates moloch (Widyastuti et al. 2020).
Table 1. Basic site information for Dieng Plateau
| Species | Hylobates moloch |
| Area | 175 km² |
| Coordinates | Lat: -7.21584 , Lon: 109.90651 |
| Type of site | Non-protected area |
| Habitat types | Subtropical/tropical moist montane forest, Subtropical/tropical heavily degraded former forest |
| Type of governance |
Types of sites Governance types Habitat types
Ape status
A 2018 survey aimed to identify the habitat suitability model (HSM) for Javan gibbons in the Dieng highland and the most influencing biophysical variables (Widyastuti et al. 2020). A total of 305 occurrence data recorded in extensive field surveys and 11 variables were maintained for HSM in presence-only machine learning, maximum entropy (MaxEnt). Suitable gibbon habitats were predicted as 81.286 km2 in the surveyed area (Widyastuti et al. 2020). Relatively large areas of suitable habitat are located in Sokokembang, Linggoasri-Mendolo, and western of Kembanglangit. The most important variables were natural forest, elevation, distance to cropland and land surface temperature (Widyastuti et al. 2020).
Table 2. Ape population estimates reported for Dieng Plateau
| Species | Year | Total number groups (95% CI) | Density [groups/km²] (95% CI) | Total number indiv. (95% CI) | Area | Method | Source | Comments | A.P.E.S. database ID |
|---|---|---|---|---|---|---|---|---|---|
| Hylobates moloch | 2018 | Dieng Plateau (175 km²) | Line transects | Widyastuti et al. 2020 | In addition to line transects, faecal samples, vocalisations, and sightings information from trusted villagers were considered as indirect evidence to obtain a robust occurrence data |
Sampling methods Analytical frameworks
Threats
Table 3. Threats to apes reported for Dieng Plateau
| Category | Specific threats | Threat level | Description | Year of threat |
|---|---|---|---|---|
| 2 Agriculture & aquaculture | 2.1 Annual & perennial non-timber crops | Present (unknown severity) | Several relatively flat areas converted into cropland, such as dry crop and rice field (Widyastuti et al. 2020). | Ongoing (2020) |
| 2 Agriculture & aquaculture | 2.2 Wood & pulp plantations | Present (unknown severity) | Plantation forest next to natural forest, such as pine tree, rubber tree, and dammar tree (Widyastuti et al. 2020). | Ongoing (2020) |
| 4 Transportation & service corridors | 4.1 Roads & railroads | Present (unknown severity) | Roads built to support development of tourist parks (Widyastuti et al. 2020). | Ongoing (2020) |
| 5 Biological resource use | 5.2 Gathering terrestrial plants | Present (unknown severity) | Collection of NTFP such as honey (Widyastuti et al. 2020). | Ongoing (2020) |
| 5 Biological resource use | 5.3 Logging & wood harvesting | High (more than 70% of population affected) | Most of the natural forest patches are secondary forest due to logging in the past (Widyastuti et al. 2020). | Ongoing (2020) |
Conservation activities
The forested areas at the site are managed by Perum Perhutani (Indonesia state-owned forestry enterprise) which are mainly responsible for forest production (Widyastuti et al. 2020).
Challenges
Table 5. Challenges reported for Dieng Plateau
| Challenges | Specific challenges | Source | Year(s) |
|---|---|---|---|
| Not reported |
Enablers
Table 6. Enablers reported for Dieng Plateau
| 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 Dieng Plateau
| Category | Behavior | Observation type | Prevalence | Observation dates | Source | Habituation | Species | Comment |
|---|---|---|---|---|---|---|---|---|
| Not reported |
Exposure to climate change impacts
External links
References
Widyastuti, S., Perwitasari-Farajallah, D., Prasetyo, L. B., Iskandar, E., & Setiawan, A. (2020). Maxent modelling of habitat suitability for the endangered javan gibbon (Hylobates moloch) in less-protected Dieng Mountains, Central Java. IOP Conference Series: Earth and Environmental Science, 457(1), 012014. doi:10.1088/1755-1315/457/1/012014
Page created by: APES Atlas Team Date: 2022-01-28