Journal
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY
Volume 67, Issue 5, Pages 805-814Publisher
SPRINGER
DOI: 10.1007/s00265-013-1504-y
Keywords
Great apes; Maternal investment; Parent-offspring conflict; Sustained lactation; Weaning
Categories
Funding
- Indonesian Institute of Science (LIPI)
- Indonesian State Ministry for Research and Technology (RisTek)
- Director General Departemen Kehutanan (PHKA)
- Departamen Dalam Negri
- local government in Central Kalimantan
- BKSDA Palangkaraya
- Bornean Orangutan Survival Foundation (BOSF)
- MAWAS in Palangkaraya
Ask authors/readers for more resources
In most mammals, females pay for reproduction by dramatically increasing net energy intake from conception to mid- or late lactation. To do this, they time their reproductive events in relation to environmental cycles so that periods of peak food availability coincide with peak demand or are used to build energy stores. This timing is not possible in species with slow development in which lactation is prolonged over a multi-year period with fluctuating food availability. Here, mothers are expected to sustain a stable but generally lower level of nutrient transfer. In a sample of over 1,050 complete follow days of eight mother-infant pairs collected over 7 years, we document maternal effort for wild Bornean orangutans (Pongo pygmaeus wurmbii) over their average 6.5-year lactation period. As predicted, maternal feeding time was independent of the age of her growing offspring, indicating a stable sustained plateau effort of a parts per thousand currency sign 25 % above baseline level, instead of a short peak lactation as seen in seasonal breeders. Infant orangutans started to regularly supplement milk with self-harvested food when they were 1-1.5 years old, indicating milk intake was insufficient from this age onwards, even though maternal effort did not decrease. We expect the same regulation of sustained maternal effort in other large and large-brained mammals with slow infant development. We also predict that mother-infant conflict over suckling may show another peak at the onset of the milk + solid food phase, in addition to the well-known conflict around the endpoint of lactation (weaning), which is reached after a long and gradual increase in solid food intake by the infant.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available