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  • 1
    Electronic Resource
    Electronic Resource
    The orangutan long call and snag crashing at Tanjung Puting Reserve (1983)
    Springer
    Primates 24 (1983), S. 371-384 
    Details
    ISSN: 0032-8332
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The long call, which is only given by adult males, is the most frequently uttered orangutan vocalization and the only one which can be heard over long distances. At the Orangutan Research and Conservation Project study area in the Tanjung Puting Reserve, Central Indonesian Borneo, adult males were calling more regularly and frequently than reported from other areas in Borneo. Adult males also exhibited a behavior, not reported elsewhere, sometimes associated with the vocalization of long calls: the pushing over of large snags (branchless dead trees) to the ground. At Tanjung Puting long calls functioned primarily to mediate dominance relationships among adult males who rarely came into direct contact with one another. In addition, long calls may have been helping sexually receptive females locate males.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02381982
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Crocodile predation on a proboscis monkey in Borneo (1985)
    Springer
    Primates 26 (1985), S. 495-496 
    Details
    ISSN: 0032-8332
    Keywords: Crocodile ; Gavial ; Predation ; Proboscis monkey ; Borneo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An adult male proboscis monkey (Nasalis larvatus) on the edge of the Sekonyer Kanan River was seized by a crocodile 6 km downstream from the Orangutan Research and Conservation Project base camp where a crocodile had taken a crab-eating macaque (Macaca fascicularis) two years earlier. This incident helps establish false gavials (Tomistoma schlegeli) as important predators on refuging primate populations in southern Borneo and indicates that predation may have influenced the evolution of some behaviors with an antipredator function in bothNasalis andMacaca fascicularis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382464
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A preliminary study of food selection by the orangutan in relation to plant quality (1994)
    Springer
    Primates 35 (1994), S. 255-263 
    Details
    ISSN: 0032-8332
    Keywords: Orangutans ; Pongo pygmaeus ; Diet ; Protein ; Fiber ; Tannins ; Alkaloids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We observed the foraging behavior of orangutans in Central Indonesian Borneo during October, November, and December 1980, and analyzed food and nonfood items for water content, neutral detergent fiber, crude protein, available crude protein, and protein:fiber ratio and the presence of alkaloids and tannins. The diet of the orangutan during this season was unusual because it consisted predominantly of seeds and unripe, rather than ripe, fruits. Also, the major diet item, the seeds ofIrvingia malayana, had been ignored in previous years when it had fruited. In leaves, protein content was more closely associated with food choice than either neutral detergent fiber or the protein:fiber ratio. Flowers had the highest protein content and protein:fiber ratio of any food item. Tannins were found in most food items, but the presence of alkaloids was found in only one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02382723
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    An unusual instance of tool-use among wild orang-utans in tanjung puting reserve, indonesian borneo (1982)
    Springer
    Primates 23 (1982), S. 138-139 
    Details
    ISSN: 0032-8332
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Despite several recent orang-utan (Pongo pygmaeus) field studies in Borneo and Sumatra, tool-use has never been reported among wild orang-utan populations in contexts other than agonistic displays or nesting/covering behaviors. During a continuous 9-year study at Tanjung Puting Reserve, Central Indonesian Borneo, only one instance of wild orang-utan tool-use outside these two contexts was observed: an adult male orang-utan broke off a dead branch and used it to scratch his rear for half a minute.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02381445
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Wild orangutan birth at tanjung puting reserve (1982)
    Springer
    Primates 23 (1982), S. 500-510 
    Details
    ISSN: 0032-8332
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract During ten years (1971–1981) of research on wild orangutans at the Orangutan Research and Conservation Project study area in the Tanjung Puting Reserve, Central Indonesian Borneo, parturition was observed twice. Observations centered on parturition totalled 1,206 hr and included 95 whole days of observation (when the target individual was followed from nest to nest). The two females who gave birth are mother and daughter, one multiparous, the other primiparous. The 1977 birth to the daughter made the older female who subsequently gave birth in 1979 the first known wild orangutan grandmother. In 1977 the entire birth process was observed while in 1979 only the emergence of the fetal membranes was seen. The females' behavior during parturition as well as prepartum and postpartum was quite different and is described. Parity may account for some of these differences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02373961
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    Paper (German National Licenses)
    Fulltext
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