(West-Sumatra, Indonesia) Towards Primate Hunting and Conse
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INTRODUCTION Collectively, this represents one of the highest rates of primate endemism per unit area anywhere (WWF 1980) The Mentawai Archipelago, situated approximately and highlights the importance of the Mentawai Islands in 150km off the west coast of Sumatra in Indonesia and the context of global primate conservation. comprising the four main islands of Siberut, Sipora, Despite the conservation significance of the Mentawai North- and South Pagai, is well known for its unusual primates, their populations are not well protected and biological richness and species endemism (WWF 1980; all are considered to be in decline (Whittaker 2006). Fuentes 1996). Covering just over 6,000km² (BPSKKM They are currently classified in the IUCN Red List (IUCN 2011), the island chain harbours a wealth of endemic 2014) either as Vulnerable (M. siberu), Endangered animals and plant species - of the mammals alone, nearly (H. klossii and P. siberu [as P. potenziani siberu]) or 60% are endemic to the region at some level (cf. Wilson & Critically Endangered (M. pagensis, S. concolor and P. Reader 2005; IUCN 2014). Amongst these are six species potenziani [as P. potenziani potenziani]); the Pig-tailed of primates, namely the Siberut- and the Pagai Island Langur also belongs to the world´s 25 most endangered Macaque (Macaca siberu and M. pagensis), both locally primates (Mittermeier et al. 2012). As in other tropical known as ‘Bokkoi’, the Siberut- and the Mentawai Langur forest regions (Bodmer et al. 1997; Dela 2011), the two or ‘Joja’ (Presbytis siberuand P. potenziani), the Pig-tailed main factors threatening primates in the Mentawais Snub-nosed Langur or ‘Simakobu’ (Simias concolor), and are habitat loss and hunting. Commercial logging, land Kloss’ Gibbon or ‘Bilou’ (Hylobates klossii) (Images 1–4). clearance and non-sustainable agricultural practices © Siberut Conservation Programme © Roland Hilgartner Image 1. Siberut Island Macaque Macaca siberu (2010) Image 2. Kloss’ Gibbon Hylobates klossii (2007) © Pauli Hien © Pauli Hien Image 3. Pig-tailed Snub-nosed Langur Simias concolor (2010) Image 4. Siberut Island Langur Presbytis siberu (2011) 6390 Journal of Threatened Taxa | www.threatenedtaxa.org | 26 October 2014 | 6(11): 6389–6398 Primate hunting and conservation: Siberut Island Quinten et al. associated with a rising human population (PHPA 1995) hunted, the reasons for hunting, current methods, have all led to significant loss of intact forest (and hunting frequencies and whether there was a difference consequently primate habitat) across the Mentawai between the island’s protected area (Siberut National region (Goeltenboth & Timotius 1993; Whittaker 2006). Park) and the rest of Siberut. From the data gathered, we Hunting has been a pressure on the local wildlife since further attempted an approximation of annual offtake the colonization of the archipelago several thousand from hunting for Siberut’s four primate species. In this years ago (Schefold 1992), and since primates were way, we hope to generate information required to better the most abundant large mammals, they became the gauge the significance of hunting as a threat to Siberut’s mainstay of hunting activities (Tilson 1977; WWF 1980). primate population and thus to support the development In the absence of other large predators (except possibly of future conservation action (plans) and initiatives for pythons and eagles, see, Whitten & Whitten 1982, Tenaza the region´s primates. & Tilson 1985), anthropogenic hunting has become one of the main causes of primate mortality in the region (Mitchell & Tilson 1986). METHODS Whilst hunting of primates on the Mentawais is Three survey teams were sent out to Siberut Island generally acknowledged to be extensive (Whittaker (0.55’–1055’S & 98035’–99020’E) from June to July 2012 2006), its impact on the primate populations remains to undertake questionnaire surveys at 50 villages, the poorly understood. Historically, primate hunting and distribution of the survey locations corresponding to the consumption of their meat were an important the distribution of villages on Siberut. Since only men part of the ceremonies and rituals associated with the participate in primate hunting activities (see e.g., Mitchell animistic belief system of the Mentawai people (Nooy- & Tilson 1986), we surveyed a total of 400 randomly Palm 1968). The use of simple bow and poison arrow as selected men 18 years or older. All households within a the predominant hunting tool along with a complex set given village were mapped, listed and sample households of customary regulations are believed to have prevented were then randomly selected using a set interval and a over-exploitation in the past (Mitchell 1982). However, random start-point. A single adult member from each as a result of early missionary influences, government household was chosen for the interview, again on a resettlement schemes and the increasing use of random basis. Village size was taken into account while modern firearms, traditional attitudes to hunting have undertaking the surveys such that at larger villages (> 75 progressively eroded (Tenaza 1987; Whittaker 2005). households) 15 interviews were administered, 10 at mid- Without the cultural restraints of former times, hunting sized villages (30–75 households), and five at smaller is now generally accepted as a significant influence on villages (< 30 households). the distribution and abundance of Mentawai primates In order to ensure that the meaning and context of (Watanabe 1981; Mitchell 1985; Fuentes 2002) and the survey questions were properly understood by the for some species (e.g., Simias) it is even viewed as the respondents, all interviewers received intensive training single greatest threat (Whittaker 2006). Unfortunately, during a 3-day workshop that included simulated