PloS one 2011: Quantifying killing of orangutans and human-orangutan conflict in Kalimantan, Indonesia.
Human-orangutan conflict and hunting are thought to pose a serious
threat to orangutan existence in Kalimantan, the Indonesian part of
Borneo. No data existed prior to the present study to substantiate these
threats. We investigated the rates, spatial distribution and causes of
conflict and hunting through an interview-based survey in the
orangutan's range in Kalimantan, Indonesia. Between April 2008 and
September 2009, we interviewed 6983 respondents in 687 villages to
obtain socio-economic information, assess knowledge of local wildlife in
general and orangutan encounters specifically, and to query respondents
about their knowledge on orangutan conflicts and killing, and relevant
laws. This survey revealed estimated killing rates of between 750 and
1800 animals killed in the last year, and between 1950 and 3100 animals
killed per year on average within the lifetime of the survey
respondents. These killing rates are higher than previously thought and
are high enough to pose a serious threat to the continued existence of
orangutans in Kalimantan. Importantly, the study contributes to our
understanding of the spatial variation in threats, and the underlying
causes of those threats, which can be used to facilitate the development
of targeted conservation management.
2011, PloS one 2011; 6(11): e27491.