Orangutan General Publication 2013

  •  Lameira et al. 2010:
    Review of geographic variation in terrestrial mammalian acoustic signals: Human speech variation in a comparative perspective
    Human speech shows an unparalleled richness in geographic variation. However, few attempts have been made to understand this linguistic diversity from an evolutionary and comparative framework. Lameira-et-al–2010
  • Meijaard et al. 2010: 
    Declining Orangutan Encounter Rates from Wallace to Present Suggest the Species was Once More Abundant
    Hunting has been underestimated as a key causal factor of orangutan density and distribution. Species population declines have been more severe than previously estimated based on habitat loss only. Meijaard-et-al-2010.
  • Spehar et al. 2010: 
    Estimating Orangutan Densities using Standing Crop and Marked Nest Count Methods

    Animal densities calculated using nest counts should be cautiously interpreted when used to make decisions about management. Spehar-et-al
  • Tropical Conservation Science Vol.4, 2011:
    Which factors determine orangutan nests’ detection probability along transects?
    Effective conservation needs a solid baseline of animal distribution, density, and abundance data to base management strategies on and evaluate the effectiveness of conservation efforts on the species of interest. Wich-and-Boyko_TCS_2011
  • PLOSone, June 2011:
    Forest Fruit Production Is Higher on Sumatra Than on Borneo
    Various studies have shown that the population densities of a number of forest vertebrates, such as orangutans, are higher on Sumatra than Borneo, and that several species exhibit smaller body sizes on Borneo than Sumatra and mainland Southeast Asia. It has been suggested that differences in forest fruit productivity between the islands can explain these patterns. Here we present a large-scale comparison of forest fruit production between the islands to test this hypothesis. Wich-et-al–PLoSONE_2011
  • Nater 2011 Pongo phylogeography:
    Sex-Biased Dispersal and Volcanic Activities Shaped Phylogeographic Patterns of Extant Orangutans (genus: Pongo)The Southeast Asian Sunda archipelago harbors a rich biodiversity with a substantial proportion of endemic species. The evolutionary history of these species has been drastically influenced by environmental forces, such as fluctuating sea levels, climatic changes, and severe volcanic activities. Orangutans (genus: Pongo), the only Asian great apes, are well suited to study the relative impact of these forces due to their well-documented behavioral ecology, strict habitat requirements, and exceptionally slow life history. To get the whole article, please send an e-mail to Serge Wich
  • Meijaard et al. 2011:
    Why Don’t We Ask?
    A Complementary Method for Assessing the Status of Great Apes Species conservation is difficult. Threats to species are typically high and immediate.
    To get the whole article, please send an e-mail to Serge Wich
  • Biological Conservation, December 2011:
    Effects of logging on orangutan behavior
    The human footprint is increasing across the world’s natural habitats, causing large negative impacts on the survival of many species. In order to successfully mitigate the negative effects on species’ survival, it is crucial to understand their responses to human-induced changes. This paper examines the effect of one such disturbance, logging, on Sumatran orangutans – a critically endangered great ape. Orangutan population densities may decrease or remain stable after logging, but data on the effects of logging on the behavior of individuals is scant. Here, we provide individual-level behavioral data based on direct observations in 2003–2008 at the Ketambe (Sumatra, Indonesia) research area (partly subject to intense selective logging) in order to assess responses of Sumatran orangutans to logging. Based on the results of this study, we provide recommendations for conservation research and guidelines for reduced-impact logging.
    To get the whole article, please send an e-mail to Serge Wich
  • Orangutans and the economics of sustainable forest management in Sumatra – http://www.unep.org/pdf/orangutan_report_scr.pdf