Fluctuations of population density in Bornean orangutans (Pongo pygmaeus morio) related to fruit availability in the Danum Valley, Sabah, Malaysia: a 10-year record including two mast fruitings and three other peak fruitings

Primates ◽  
2016 ◽  
Vol 58 (1) ◽  
pp. 225-235 ◽  
Author(s):  
Tomoko Kanamori ◽  
Noko Kuze ◽  
Henry Bernard ◽  
Titol Peter Malim ◽  
Shiro Kohshima
Keyword(s):  
Population Density ◽  
Pongo Pygmaeus ◽  
Fruit Availability ◽  
Bornean Orangutans

The blowgun is mightier than the chainsaw in determining population density of Bornean orangutans (Pongo pygmaeus morio) in the forests of East Kalimantan

2006 ◽  
Vol 129 (4) ◽  
pp. 566-578 ◽  
Author(s):  
Andrew J. Marshall ◽  
Nardiyono ◽  
Linda M. Engström ◽  
Bhayu Pamungkas ◽  
Jhon Palapa ◽  
...  
Keyword(s):  
Population Density ◽  
Pongo Pygmaeus ◽  
East Kalimantan ◽  
Bornean Orangutans

scholarly journals After the smoke has cleared: Extended low fruit productivity following forest fires decreased gregariousness and social tolerance among wild female Bornean orangutans (Pongo pygmaeus wurmbii)

2021 ◽  
Author(s):  
Alison M. Ashbury ◽  
Jade Meric de Bellefon ◽  
Julia A. Kunz ◽  
Misdi Abdullah ◽  
Anna M. Marzec ◽  
...  
Keyword(s):  
Forest Fires ◽  
Extended Period ◽  
Pongo Pygmaeus ◽  
Food Sources ◽  
Social Tolerance ◽  
Wild Female ◽  
Fruit Availability ◽  
Adult Females ◽  
Pongo Pygmaeus Wurmbii ◽  
Bornean Orangutans

AbstractAs climate change continues to fundamentally alter resource landscapes, the ability to flexibly respond to spatio-temporal changes in the distribution of preferred food sources is increasingly important for the overall health and fitness of animals living in seasonal, variable, and/or changing environments. Here, we investigate the effects of an uncharacteristically long period of fruit scarcity, following widespread thick haze caused by peat and forest fires in 2015, on the behaviour and sociality of female Bornean orangutans (Pongo pygmaeus wurmbii). We collected data from 2010 to 2018 at Tuanan, Central Kalimantan, Indonesia, and compared the activity, diet, and association patterns of adult females during low-fruit periods before the fires, i.e., regular, seasonal periods of low fruit availability (“pre-fire”), and after the fires, i.e., during the extended period of low fruit availability (“post-fire”). First, we found that, post-fire, female orangutans adopted a more extreme energy-saving activity pattern and diet — resting more, travelling less, and diet-switching to less-preferred foods — compared to pre-fire. Second, we found that the probabilities of association between females and their weaned immature offspring, and between related and unrelated adult females were lower, and the probability of agonism between unrelated females was higher, post-fire than pre-fire. This change in energetic strategy, and the general reduction in gregariousness and social tolerance, demonstrates how forest fires can have lasting consequences for orangutans. Fission–fusion species such as orangutans can mitigate the effects of changes in resource landscapes by altering their (sub)grouping patterns; however, this may have long-term indirect consequences on their fitness.

scholarly journals Successful observation of orangutans in the wild with thermal-equipped drones

2019 ◽  
Vol 7 (3) ◽  
pp. 235-257 ◽  
Author(s):  
Claire Burke ◽  
Maisie F. Rashman ◽  
Steven N. Longmore ◽  
Owen McAree ◽  
Paul Glover-Kapfer ◽  
...  
Keyword(s):  
Pongo Pygmaeus ◽  
Thermal Camera ◽  
Survey Tool ◽  
In The Wild ◽  
Successful Observation ◽  
Proboscis Monkeys ◽  
Bornean Orangutans

We investigated the efficacy of a drone equipped with a thermal camera as a potential survey tool to detect wild Bornean orangutans (Pongo pygmaeus) and other tropical primates. Using the thermal camera we successfully detected 41 orangutans and a troop of proboscis monkeys, all of which were confirmed by ground observers. We discuss the potential advantages and limitations of thermal-equipped drones as a tool to complement other methods, and the potential of this technology for use as a future survey tool.

Home range establishment and the mechanisms of philopatry among female Bornean orangutans (Pongo pygmaeus wurmbii) at Tuanan

2020 ◽  
Vol 74 (4) ◽  
Author(s):  
Alison M. Ashbury ◽  
Erik P. Willems ◽  
Sri Suci Utami Atmoko ◽  
Fajar Saputra ◽  
Carel P. van Schaik ◽  
...  
Keyword(s):  
Home Range ◽  
Pongo Pygmaeus ◽  
Pongo Pygmaeus Wurmbii ◽  
Bornean Orangutans

scholarly journals Bornean orangutans on the brink of protein bankruptcy

2011 ◽  
Vol 8 (3) ◽  
pp. 333-336 ◽  
Author(s):  
Erin R. Vogel ◽  
Cheryl D. Knott ◽  
Brooke E. Crowley ◽  
Melissa D. Blakely ◽  
Michael D. Larsen ◽  
...  
Keyword(s):  
G Protein ◽  
Daily Intake ◽  
Urinary Metabolites ◽  
Pongo Pygmaeus ◽  
Wild Animals ◽  
Protein Balance ◽  
Mountain Gorillas ◽  
Fat Reserves ◽  
Adaptive Value ◽  
Bornean Orangutans

Protein is a limiting resource that is essential to the growth, maintenance and reproduction of tropical frugivores, yet few studies have examined how wild animals maintain protein balance. During chronic periods of fruit scarcity, Bornean orangutans ( Pongo pygmaeus ) often catabolize their own fat reserves despite unusually low metabolic requirements. Such energy deficits suggest a marginal existence, and raise the possibility that orangutans also endure periods of negative protein balance. To test this hypothesis, we conducted the first study of protein cycling in a wild primate. Our five year analysis of urinary metabolites revealed evidence of protein recycling when fruit was scarce. During these periods, orangutans consumed more leaves and bark, proteinaceous but tough foods that yielded a mean daily intake of 1.4 g protein kg −1 metabolic mass. Such an amount is inadequate for humans and one-tenth the intake of mountain gorillas, but sufficient to avert, perhaps narrowly, a severe protein deficit. Our findings highlight the functional and adaptive value of traits that maximize protein assimilation during periods of ecological exigency.

Nonaggressive interventions by third parties in conflicts among captive Bornean orangutans (Pongo pygmaeus)

Primates ◽  
2010 ◽  
Vol 51 (2) ◽  
pp. 179-182 ◽  
Author(s):  
Tomoyuki Tajima ◽  
Hidetoshi Kurotori
Keyword(s):  
Third Parties ◽  
Pongo Pygmaeus ◽  
Bornean Orangutans

scholarly journals Nutritional ecology of wild Bornean orangutans (Pongo pygmaeus wurmbii ) in a peat swamp habitat: Effects of age, sex, and season

2016 ◽  
Vol 79 (4) ◽  
pp. e22618 ◽  
Author(s):  
Erin R. Vogel ◽  
Shauhin E. Alavi ◽  
Sri Suci Utami-Atmoko ◽  
Maria A. van Noordwijk ◽  
Timothy D. Bransford ◽  
...  
Keyword(s):  
Nutritional Ecology ◽  
Pongo Pygmaeus ◽  
Peat Swamp ◽  
Pongo Pygmaeus Wurmbii ◽  
Bornean Orangutans
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