The population and distribution of orangutans (Pongo pygmaeus pygmaeus) in and around the Danau Sentarum Wildlife Reserve, West Kalimantan, Indonesia

Russon, Anne E.; Erman, Andi; Dennis, Rona

doi:10.1016/s0006-3207(00)00087-2

Cited by 95 publications

(38 citation statements)

References 4 publications

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“…This study, in common with several others, shows that orang-utan densities decrease following disturbance caused by logging activities (e.g. MacKinnon, 1971;Rijksen, 1978;Davies and Payne, 1982;van Schaik et al, 1995a;Russon et al, 2001). When orang-utan are exposed to human disturbance they move out of the local area but may return again once the disturbance is over (MacKinnon, 1971) except that if the disturbance is throughout a female's home range she will not be able to escape the disturbance (Singleton, personal communication).…”

Section: Orang-utan Densities and Population Sizesupporting

confidence: 84%

“…More recently, a study by Singleton (2000) at Suaq Balimbing, Sumatra, estimated an r value of 1.9. Comparable data does not exist for Kalimantan, so the first nest count surveys here used the median Sumatran figure of 1.7 (Yanuar et al, 1996;Russon et al, 2001). There appears, however, to be differences between the rates of nest production by the different orang-utan species.…”

Section: Estimating the Parametersmentioning

confidence: 99%

“…In contrast, Singleton (2000) suggested a mean value of 228 days for swamp forest and 319 days for low-hill forest at Suaq Balimbing, Sumatra. For Borneo, Lackman-Ancrenaz (unpublished memorandum) has estimated t to be approximately 250 days in Sabah, whilst a study using the Markov Chain method (details later) provided a value of 145 days in Danau Sentarum Wildlife Reserve, West Kalimantan (Russon et al, 2001). This gives a range of values for t of 145-250 days for Borneo and 81-319 days for Sumatra.…”

Section: Estimating the Parametersmentioning

confidence: 99%

“…In addition, corrections adopted at the 1993 Orang-utan PHVA Workshop have been applied to the total population sizes to prevent upwardly biased estimates (Rijksen et al, 1995). These authors suggested a correction Table 3 Orang-utan densities (D) calculated from the nest densities in Table 2 Russon et al (2001). e Rijksen (1978).…”

Section: Estimating the Population Size Within The Greater Sg Sebangmentioning

confidence: 99%

“…Other studies have used 0.75-0.80 where it is considered one or more of these factors are not relevant (van Schaik et al, 1995b(van Schaik et al, , 2001Russon et al, 2001). It could be argued that these reduction factors do not apply to our study as the surveys took place within identified habitat sub-types, within areas where the degree of logging disturbance was known and with the assistance of up-to-date satellite images.…”

Section: Estimating the Population Size Within The Greater Sg Sebangmentioning

confidence: 99%

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Population status of the Bornean orang-utan (Pongo pygmaeus) in the Sebangau peat swamp forest, Central Kalimantan, Indonesia

Morrogh‐Bernard

Husson

Page

et al. 2003

Biological Conservation

186

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Section: Orang-utan Densities and Population Sizesupporting

confidence: 84%

Section: Estimating the Parametersmentioning

confidence: 99%

Section: Estimating the Parametersmentioning

confidence: 99%

Section: Estimating the Population Size Within The Greater Sg Sebangmentioning

confidence: 99%

Section: Estimating the Population Size Within The Greater Sg Sebangmentioning

confidence: 99%

See 3 more Smart Citations

Population status of the Bornean orang-utan (Pongo pygmaeus) in the Sebangau peat swamp forest, Central Kalimantan, Indonesia

Morrogh‐Bernard

Husson

Page

et al. 2003

Biological Conservation

186

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Nest groups of wild bonobos at Wamba: selection of vegetation and tree species and relationships between nest group size and party size

Mulavwa¹,

Yangozene²,

Yamba-Yamba³

et al. 2010

American J Primatol

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We examined the location of nest groups, spatial distribution of nests within a nest group, and attributes of individual nests of wild bonobos at Wamba, Democratic Republic of Congo. We also examined the seasonal factors influencing nesting behavior and compared the nest group size with the 1 hr party size during daytime. We defined a nest group to be a cluster of nests that were built in the same evening and found within 30 m from the other nearest nest. Examination of the largest gap within a nest group suggested that 30 m was an acceptable cutoff value. Monthly rainfall or fruit abundance did not significantly influence the monthly mean nest group size. Nests were built in the swamp forest for as many as 13% observation days, suggesting the need for reevaluation of the use of swamp forest by bonobos. The use of swamp forest was influenced not by seasonal rainfall or fruit abundance, but by the fruiting of specific species. Preferred tree species for building nests accounted for 19.8% of standing trees, which suggested that the selection of sleeping sites was not largely restricted by the distribution of specific species. The mean 1 hr party size was almost identical through the day and was similar to the mean nest group size. Parties of bonobos sometimes split into smaller nest groups, especially when feeding on non-preferred fruits during fruit scarcity. By contrast, when feeding on preferred fruits while ranging in large parties, they often aggregated to form even larger nest groups. When sleeping in small- or middle-sized nest groups, they tended to aggregate the next morning. These tendencies may reflect the gregarious nature of bonobos who prefer to range or sleep together as far as circumstances allow.

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Indigenous Peoples, Primates, and Conservation Evidence: A Case Study Focussing on the Waorani of the Maxus Road

Papworth

2016

Ethnoprimatology

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The population and distribution of orangutans (Pongo pygmaeus pygmaeus) in and around the Danau Sentarum Wildlife Reserve, West Kalimantan, Indonesia

Cited by 95 publications

References 4 publications

Population status of the Bornean orang-utan (Pongo pygmaeus) in the Sebangau peat swamp forest, Central Kalimantan, Indonesia

Population status of the Bornean orang-utan (Pongo pygmaeus) in the Sebangau peat swamp forest, Central Kalimantan, Indonesia

Nest groups of wild bonobos at Wamba: selection of vegetation and tree species and relationships between nest group size and party size

Indigenous Peoples, Primates, and Conservation Evidence: A Case Study Focussing on the Waorani of the Maxus Road

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