Maria A. van Noordwijk, Simone E.B. Sauren, Nuzuar Abulani Ahbam, Helen C. Morrogh-Bernard, S. Suci Utami Atmoko, and Carel P. van Schaik
- Published in print:
- 2008
- Published Online:
- May 2009
- ISBN:
- 9780199213276
- eISBN:
- 9780191707568
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199213276.003.0012
- Subject:
- Biology, Animal Biology, Biodiversity / Conservation Biology
Among known mammals, orangutans have the longest period of dependence and exclusive association between mother and offspring before a younger sibling is born. Comparison of available data on wild ...
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Among known mammals, orangutans have the longest period of dependence and exclusive association between mother and offspring before a younger sibling is born. Comparison of available data on wild Sumatran and Bornean orangutans reveals a similar development of essential survival skills up to c. 5 years of age, but among Bornean orangutans earlier complete weaning and start of independent ranging through cessation of the association between mother and offspring, despite reported higher food availability in Sumatra. It is suggested that this difference is related to the assumed difference in main cause of mortality: starvation during irregular periods of widespread drought in Borneo vs predation in Sumatra. The benefits of association to both mother and offspring are likely to be different under these different selection pressures. To understand fully the differences between and variation among Bornean and Sumatran orangutans more high quality long-term demographic data on several populations are needed.Less
Among known mammals, orangutans have the longest period of dependence and exclusive association between mother and offspring before a younger sibling is born. Comparison of available data on wild Sumatran and Bornean orangutans reveals a similar development of essential survival skills up to c. 5 years of age, but among Bornean orangutans earlier complete weaning and start of independent ranging through cessation of the association between mother and offspring, despite reported higher food availability in Sumatra. It is suggested that this difference is related to the assumed difference in main cause of mortality: starvation during irregular periods of widespread drought in Borneo vs predation in Sumatra. The benefits of association to both mother and offspring are likely to be different under these different selection pressures. To understand fully the differences between and variation among Bornean and Sumatran orangutans more high quality long-term demographic data on several populations are needed.
Madeleine E. Hardus, Adriano R. Lameira, Ian Singleton, Helen C. Morrogh-Bernard, Cheryl D. Knott, Marc Ancrenaz, S. Suci Utami Atmoko, and Serge A. Wich
- Published in print:
- 2008
- Published Online:
- May 2009
- ISBN:
- 9780199213276
- eISBN:
- 9780191707568
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780199213276.003.0004
- Subject:
- Biology, Animal Biology, Biodiversity / Conservation Biology
This chapter provides an overview of the sounds and vocalizations that Sumatran and Bornean orangutans produce. The current data set indicates that there are at least 32 different orangutan sounds ...
More
This chapter provides an overview of the sounds and vocalizations that Sumatran and Bornean orangutans produce. The current data set indicates that there are at least 32 different orangutan sounds and vocalizations that can be distinguished. Interestingly enough not all of these are produced by all individuals in all populations and several occur only in certain populations, but not in others. These preliminary findings indicate that there might be socially learned variation in orangutan sounds and that the cultural domain includes sounds. Future studies should examine such possibilities in detail.Less
This chapter provides an overview of the sounds and vocalizations that Sumatran and Bornean orangutans produce. The current data set indicates that there are at least 32 different orangutan sounds and vocalizations that can be distinguished. Interestingly enough not all of these are produced by all individuals in all populations and several occur only in certain populations, but not in others. These preliminary findings indicate that there might be socially learned variation in orangutan sounds and that the cultural domain includes sounds. Future studies should examine such possibilities in detail.
