Nest density as determinants for habitat utilizations of Bornean orangutan (Pongo pygmaeus wurmbii) in degraded forests of Gunung Palung National Park, West Kalimantan

Abstract. Fauzi F, Suemarno, Afandhi A, Leksono AS. 2020. Nesting behavior of Bornean immature Orangutan (Pongo pygmaeus wurmbii) in Nyaru Menteng Arboretum School, Palangka Raya, Central Kalimantan, Indonesia. Biodiversitas 21: 2172-2179. This research aimed at analyzing the nesting behavior of Bornean Orangutan (Pongo pygmaeus wurmbii) in Nyaru Menteng Arboretum, Palangka Raya, Central Kalimantan, Indonesia. The objects of observation were the immature orangutan nest, and the type of nest tree. The purposive sampling technique was used because not all immature Orangutan could make a nest. The Focal animal sampling method was used to determine the daily behavior and nets building activity. It involved observing and recording the behavior of five young Orangutans over a certain period of time and analyzing the nest made. The results of the study established that the daily activity of immature Orangutan on an average sequentially ranges from feeding 17.18%, moving 23.92%, resting 26.34%, and social behavior 32.57%. The process of making a nest begins with finding a suitable branch, bending and breaking twigs, and then arranging the twigs and leaves as a mattress. The duration of building a nest was 5.00 to 6.44 minutes, the preferred nest tree was Palaquium xanthochymum and Shorea spp., and the direction of the nest more facing west.

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First Bornean orangutan sighting in Usun Apau National Park, Sarawak

Biodiversity Data Journal ◽

10.3897/bdj.9.e60753 ◽

2021 ◽

Vol 9 ◽

Author(s):

Ahmad Ampeng ◽

Jack Liam ◽

Boyd Simpson ◽

Carl Traelholt ◽

Shukor Md Nor ◽

...

Keyword(s):

Species Distribution ◽

National Park ◽

Distribution Range ◽

Pongo Pygmaeus ◽

Bornean Orangutan

Wildlife surveys were conducted in Usun Apau National Park (UANP), Sarawak from Oct 2017 to Oct 2020. This was the first attempt to document fauna diversity in Usun Apau National Park on the UANP plateau at 1200-1400 m a.s.l. On 17 September 2020, 10 AM, we observed an orangutan individual, Pongo pygmaeus, over a period of one minute at Libut Camp UANP (E: 114039’.546, N: 2052’36.44) at 1,020 m a.s.l. We also recorded four nests and orangutan vocalisation twice. This observation is important for Bornean orangutan conservation as this was the first orangutan sighting in UANP and well outside the species distribution range for in Sarawak.

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New estimates of orangutan density in Sungai Palin watershed, Kapuas Hulu, West Kalimantan, Indonesia

Oryx ◽

10.1017/s0030605319000875 ◽

2019 ◽

Vol 54 (6) ◽

pp. 763-766 ◽

Cited By ~ 1

Author(s):

Achmad Yanuar ◽

Jan Fehse ◽

David Chivers ◽

Jito Sugardjito

Keyword(s):

Distance Sampling ◽

Pongo Pygmaeus ◽

Critically Endangered ◽

Sampling Techniques ◽

West Kalimantan ◽

Bornean Orangutan ◽

Peat Swamp ◽

Pongo Pygmaeus Pygmaeus ◽

Conservation And Management

AbstractPongo pygmaeus pygmaeus is a subspecies of Bornean orangutan whose distribution is restricted to the northern part of the Kapuas River, West Kalimantan, and is categorized as Critically Endangered. In October 2017 we carried out a survey to estimate orangutan density in the peat-swamp forests of the Sungai Palin watershed, of the upper Kapuas river, Kapuas Hulu, West Kalimantan, Indonesia. Surveys for orangutans in 1991, in nearby Nanga Awen, had indicated the presence of orangutans in the peat-swamp forests of this area. We used distance sampling techniques to estimate orangutan densities from nest observations. We recorded 76 orangutan nests along 4.5 km transects in Sungai Palin in 2017, and 71 orangutan nests were observed along 4.3 km transects in Nanga Awen in 1991, giving densities of 1.29 and 2.62 individuals/km2, respectively. The results of this orangutan survey can be used as a baseline for monitoring of orangutan populations for conservation and management of this watershed landscape.

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The Bornean orangutan (Pongo pygmaeus wurmbii) density in a logging concession of Hulu Belantikan, Central Kalimantan, Indonesia

Biodiversitas Journal of Biological Diversity ◽

10.13057/biodiv/d200336 ◽

2019 ◽

Vol 20 (3) ◽

pp. 878-883 ◽

Cited By ~ 1

Author(s):

IMAN SAPARI ◽

DYAH PERWITASARI-FARAJALLAH ◽

SRI SUCI UTAMI ATMOKO

Keyword(s):

Selective Logging ◽

Pongo Pygmaeus ◽

Line Transect ◽

Natural Forests ◽

Central Kalimantan ◽

Protection Forest ◽

Critically Endangered Species ◽

Bornean Orangutan ◽

Large Trees ◽

Pongo Pygmaeus Wurmbii

Abstract. Sapari I, Perwitasari-Farajallah D, Utami Atmoko SS. 2019. The Bornean orangutan (Pongo pygmaeus wurmbii) density in a logging concession of Hulu Belantikan, Central Kalimantan, Indonesia. Biodiversitas 20: 878-883. The Bornean orangutan is currently categorized as a critically endangered species. It is found in natural forests in Borneo, where about 78% of the total population is found outside protected areas, of which 29% is in logging concessions. This study aimed to analyze the density of the orangutan population and the abundance of fruiting plants in a logging concession and Protection Forest (Hutan Lindung) in the Hulu Belantikan forests in Lamandau District, Central Kalimantan, Indonesia. Research and data collection was conducted between December 2013 to October 2014. Orangutan population density was calculated using line transect methodology based on nest counts. Abundance of fruit plants was calculated using the fruit trail method. The highest orangutan density, 4.8 individuals/km2, was found in Protection Forest; and the lowest density, 0.4 individuals/km2, was in [Sopanan] the 2013 logging block. Observations in the logging area indicated that selective logging could alter the structure and gap of the canopy and reduce the proportion of large trees. Changes in forest structure resulted in negative effects on the density of the orangutan population. The remaining degraded forests can still be a valuable resource for the orangutan. As long as the disturbance is not intensive, orangutans will retain access to the less disturbed forest nearby and to forests that are still connected to primary forests. The existence of Protection Forest and old logged-over forests around logging blocks are very important for conservation, providing refugia for orangutans and other species when logging occurs.

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ANALISIS KANDUNGAN AIR SUMBER PAKAN ORANGUTAN KALIMANTAN (Pongo pygmaeus wurmbii) DI STASIUN RISET CABANG PANTI TAMAN NASIONAL GUNUNG PALUNG KALIMANTAN BARAT

JURNAL HUTAN LESTARI ◽

10.26418/jhl.v8i4.43804 ◽

2020 ◽

Vol 8 (4) ◽

pp. 705

Author(s):

Victor Samudera ◽

Hari Prayogo ◽

Ganjar Oki Widhanarto

Keyword(s):

Water Content ◽

The Body ◽

Pongo Pygmaeus ◽

Food Sources ◽

Feed Water ◽

Analysis Method ◽

Food Ingredient ◽

Bornean Orangutan ◽

Pongo Pygmaeus Wurmbii ◽

And Gender

Water is a very important nutrient for primate health, as it serves as a medium facilitating chemical reactions in the body. The abundance of food sources in forests is one of the things keeping orangutans from extinction. Therefore, it is important to know the proportion of water in the food of orangutans in the forest, their natural environment. Our goal was to define the content of water in the diet of Bornean Orangutan (Pongo pygmaeus wurmbii). The method used in this study is gravimetry, an analysis method based on weight measurements involving the formation, isolation and measurement of the weight of a food ingredient. Results showed the highest water content in the fruits of genus Gironniera 93,634%, and the lowest in the fruits of genus Ficus 38,771%. Based on age and gender, the percentage of consumption of feed water content in orangutans shows that there are differences.Keywords: Analysis of water content, feed, orangutans

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