Crop-Raiding Macaques: Predictions, Patterns and Perceptions from Langtang National Park, Nepal
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Vol. 20: 217–226, 2013 ENDANGERED SPECIES RESEARCH Published online May 31 doi: 10.3354/esr00502 Endang Species Res FREEREE ACCESSCCESS Crop-raiding macaques: predictions, patterns and perceptions from Langtang National Park, Nepal Ganga Ram Regmi1,2, K. Anne-Isola Nekaris1, Kamal Kandel2, Vincent Nijman1,* 1Department of Anthropology and Geography, Oxford Brookes University, Oxford OX3 0BP, UK 2Global Primate Network-Nepal, GPO Box 26288, Kathmandu, Nepal ABSTRACT: Crop-raiding by wild animals is increasingly known to cause conflict between these animals and humans; subsequent losses incurred by farmers may make communities antagonistic and intolerant towards wildlife protection. There is an increasing need to understand interspecific and geographic differences in patterns of crop-raiding. Here, focussing on macaques, a group of primates that feature high on the list of crop-raiders throughout Asia, we calculate incidence rates (IRs; the proportion of farms where a particular crop is raided by macaques in relation to the total number of farms where this crop is grown and available to macaques) for different crops and relate this to physical and temporal features. Based on interview data from 120 farmers in 3 Vil- lage Development Committees in Lantang National Park in Nepal, IRs were highest for potato (0.783) and maize (0.697) and lower for cereals (0.353 and 0.357 for buckwheat and millet, respec- tively), and IRs of 4 crops were negatively related to the distance to the forest edge. IRs for potato and maize were close to 1 near the forest edge but dropped significantly when the distance between the forest edge and fields exceeded 150 and 400 m, respectively. Farmers mostly employed benign crop-deterrent tactics, but macaques disproportionally raided farms in the early hours of the day, presumably to avoid conflict with farmers. Comparisons with IRs from other macaque species from Sri Lanka and Indonesia show that IRs are not related to caloric or nutri- tional content of crops or to the quantities in which crops are grown. With respect to the manage- ment of macaques and mitigating conflict due to crop-raiding, we advocate an integrative approach taking into account both the IRs and the interactions among macaques, crops and farmers but also the relations among the farmers themselves and the local authorities. KEY WORDS: Cercopithecidae · Conservation attitudes · Crop-raiding risk · Human–wildlife conflict · Management Resale or republication not permitted without written consent of the publisher INTRODUCTION developing countries often have limited access to cash and are rarely compensated for their losses, the Crop-raiding by wild animals is increasingly individual economic losses suffered from crop-raid- known to be a source of conflict between the animals ing can be relatively high (Nyhus et al. 2005, Linkie and humans, perhaps especially so along the bound- et al. 2007, Warren et al. 2007). Furthermore, farm- aries of protected areas (Strum 1994, Naughton- ers’ inability to mitigate crop-raiding adequately and Treves 1998, Sekhar 1998, Gillingham & Lee 2003, the absence of compensation schemes may lead to Linkie et al. 2007, Riley 2007). The losses incurred by retaliatory killing of problem species (Jackson & farmers may make communities living close to pro- Wangchuk 2001, Nyhus et al. 2005). Several studies tected areas antagonistic and intolerant towards have found that proximity of a farm to the forest edge wildlife, which can undermine and impede conserva- and the presence or absence of neighbouring farms tion strategies (Nyhus et al. 2000). Because farmers in best explains the likelihood of any farm sustaining *Corresponding author. Email: [email protected] © Inter-Research 2013 · www.int-res.com 218 Endang Species Res 20: 217–226, 2013 crop damage (Hill 2002, Priston 2005, Warren et al. We test the null hypotheses that a crop’s incidence 2007, Nijman & Nekaris 2010a,b, Wallace 2010). rate (IR, the risk of a crop being raided; see ‘Materials Hence, it seems that farmers that reside close to the and methods: Analysis’) does not differ among crops border of protected forest reserves or that cultivate and that macaques raid crops irrespective of the loca- crops within the park boundaries are especially tion of the fields on which the crops are grown. Crop- vulnerable to crop-raiding. raiding furthermore has no relation to the nutritional While many species raid cultivated crops (e.g. content of crops or the number of farms on which the insects, rodents, birds and livestock), primates in crops are grown. We assume that farmers protect all particular can be significant pests because of their crops equally, and thus, we do not expect any tempo- opportunism, adaptability, intelligence and manipu- ral differences in raiding events. These predictions lative abilities (Naughton-Treves 1998, Sillero-Zubiri should hold for various species of macaques in & Switzer 2001, Warren et al. 2007). Farmers’ percep- various regions. tions of the most notorious crop pests are often influ- enced by factors other than crop damage (Naughton- Treves et al. 1998, Hill 2004, Naughton-Treves & MATERIALS AND METHODS Treves 2005). The generally high visibility of, and crop-raiding strategies employed by, primates com- Study area pared to other crop-raiders may lead farmers to per- ceive primates to be even more important crop- The government of Nepal established Langtang raiders than they already are; this has important National Park (85° 33’ E, 28° 12’ N) in 1976; it is management implications. located in north-central Nepal on the China-Tibet In Africa, baboons Papio spp. and vervets Chloro- border. Covering an altitudinal range from 800 to cebus spp. top the list of crop-raiding primates (King >7200 m a.s.l., habitats within the park range from & Lee 1987, Saj et al. 2001, Sillero-Zubiri & Switzer subtropical forest to perpetual snow (Sayers & Nor- 2001, Warren et al. 2007, Wallace 2010). Throughout conk 2008). In 1998, the authorities designated most of Asia, the macaques Macaca spp. are per- 420 km2 in and around the park as a buffer zone. It ceived as the most important culprits (Pirta et al. now encom passes 2130 km2 in 3 districts, viz. 1997, Knight 1999, Marchal 2005, Linkie et al. 2007). Rasuwa, Nuwakot and Sindhupalchowk. Some 45 Crop-raiding by Japanese macaques M. fuscata has villages in 26 Village Development Committees are been studied since the 1960s (e.g. Sprague & Iwasak within the park boundaries (Bhuju et al. 2007). From 2006, Agetsuma 2007, Yamagiwa 2008, Nakagawa et the time of gazettment, the villages have been per- al. 2010, Yamada & Muroyama 2010). While the num- mitted to farm in the park and are not under the park ber of detailed studies of crop-raiding macaques in jurisdiction. other parts of Asia is on the increase (e.g. Priston We worked in and with 3 Village Development 2005, Linkie et al. 2007, Riley 2007, Nijman & Ne - Committees, Ramche, Syafru and Timure (Rasuwa karis 2010b, Nekaris et al. 2013), there is still an District), situated within the boundaries of the increasing need for a proper understanding of crop- national park. The villages are relatively compact, raiding, including interspecific and geographic dif- and during the last census of 2001, Ramche and ferences in crop-raiding patterns (cf. Sillero-Zubiri & Syafru were of a similar size (397 houses and 2153 Switzer 2001, Gumert et al. 2011). Information on people in Rachme and 484 houses and 2141 people in crop-raiding in the only species of non-Asian Syafru), and Timure was decisively smaller (102 macaque, M. sylvanus from North Africa, is sparse houses and 517 people). but conflicts with local people have been reported as While some villagers gain an income from sporadic a result of crop-raiding (Deag 1977, Butynski et al. village or home-stay tourism, agriculture provides 2008). the main livelihood. Maize Zea mays and potatoes Here, we report on patterns and perception of Solanum tuberosum are the chief staple crops, with crop-raiding by macaques in a farming community smaller areas dedicated to growing finger millet located inside the boundaries of an established Eleusine coracana, buckwheat Fagopyrum tataricum national park. We also present data on crop-raiding and barley Hordeum vulgare. Around their houses, by 3 other macaque species from 3 other regions all villagers grow additional crops, such as banana collected and analysed in a comparable manner, to Musa spp., for subsistence. provide insights into the perceptions of crop-raiding Although the majority of people living in Langtang by macaques in general. National Park consider themselves Buddhist or Regmi et al.: Crop-raiding macaques in Nepal 219 Hindu, with associated respect for primates, high were geo-referenced with a hand-held GPS. We incidences of crop-raiding have led to the occasional made several attempts to follow groups, but given retaliatory killing of macaques (Chalise & Johnson the terrain and the fact that the macaques were not 2005, Regmi & Kandel 2008, Chalise 2010). habituated to humans, this proved to be impossible. We encountered 2 of the 3 primate species present in the park, Assamese macaques Macaca assamensis Interviews and Nepal grey langurs Semnopithecus schistaceus, with the former being ubiquitous between elevations We used semi-structured interviews to investigate of 1300 to 2400 m a.s.l. and the latter occurring more the farmers’ perceptions of crop-raiding by primates. sparsely above 2000 m a.s.l. away from the villages. We held interviews in May to July 2007 with 120 The farmers were able to distinguish between the household owners (n = 40 in each Village Develop- Assamese macaques and the Nepal grey langurs and ment Committee, spending ~3 wk per village) whose to confirm the absence of rhesus macaques M. farms were situated relatively close to nearby forest mulatta in their area. With reference to crop-raiding, areas or vegetated rocky outcrops (median distance the Assamese macaque was the most prominent pri- ~100 m for all 3 villages, range 15 to 900 m; measured mate species, and our interviews therefore focussed with a handheld GPS).