Abundance and Distribution of Sympatric Gibbons in a Threatened Sumatran Rain Forest

@article{OBrien2004AbundanceAD,
  title={Abundance and Distribution of Sympatric Gibbons in a Threatened Sumatran Rain Forest},
  author={Timothy G. O'Brien and Margaret F. Kinnaird and Anton Nurcahyo and Mohamed Iqbal and Mohamed Rusmanto},
  journal={International Journal of Primatology},
  year={2004},
  volume={25},
  pages={267-284}
}
Agile gibbons (Hylobates agilis) and siamangs (Symphalangus syndactylus) are sympatric small apes inhabiting threatened forests of Sumatra, Indonesia. We censused both species in the 3,568-km2 Bukit Barisan Selatan National Park, at the southern limit of their ranges, over a 7-mo period in 2001. First, we monitored daily calling rates from known populations to develop probabilities of calling during a specified number of days and used the probability of calling at ≥1 time during 3 days to… 
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