Northeast Cambodia Research Articles

Climate-related loss and damage in contexts of agrarian change: differentiated sense of loss from extreme weather events in northeast Cambodia

The uneven burden of climate-related losses and damages and its implications for equity and social justice are receiving growing attention in science and policy. Smallholder farmers, indigenous groups, and ethnic minorities are often identified as particularly vulnerable and likely to experience a greater burden of climate-related loss and damage. However, limited attention has been paid to experiences of climate-related loss and damage in contexts of agrarian change and related struggles, especially around land. In this paper, we analyse experiences of climate-related loss amongst smallholder farmers in Ratanakiri province, northeast Cambodia. We derive an analytical framework from political economy of vulnerability and sociology of loss to explain farmers’ sense of loss from climate change and foreground intangible dimensions of climate-related loss. We use a mixed-methods approach with a hierarchical regression analysis of a household survey (n = 295), individual interviews, and focus group discussions across eleven villages. We find that a higher number of livelihood activities, greater values related to land, types of negative impacts experienced, and stronger perception of changes in extreme weather events are associated with a greater sense of loss. Meanwhile, a higher ability to repay loans and secure land tenure is associated with a lower sense of loss. Our results demonstrate how experiential, relational, and normative dimensions of climate-related loss are co-produced through processes of agrarian change such as financialization and histories of land struggles (i.e. through debt failure and fear of loss of access to land). This study contributes a deeper understanding of people’s lived experiences of loss arising from climate change impacts in agrarian contexts and their implications for climate justice.

Asiatic black bears and sun bears in Virachey National Park, Northeast Cambodia

A wildlife camera-trapping survey spanning 5 years, from January 2014 to 2021 in Virachey National Park in Northeast Cambodia, turned up notable records of Asiatic black bears (Ursus thibetanus) and sun bears (Helarctos malayanus). Both species are in decline throughout Indochina (Vietnam, Laos, and Cambodia) as a result of illegal logging, agricultural and infrastructure development that encroaches on forest habitat, and a widespread snaring crisis that supplies the illegal wildlife trade. We deployed 44 camera traps in 3 separate survey areas, resulting in 133 independent encounters of sun bears, 44 of black bears, and 2 Ursidae, where the species could not be determined. Despite the threats facing both species, our records show that the Park is an important refuge and further, more widespread and structured surveys are warranted to help identify priority areas for bear conservation.

Ten-year persistence and evolution of Plasmodium falciparum antifolate and anti-sulfonamide resistance markers pfdhfr and pfdhps in three Asian countries.

The amplification of GTP cyclohydrolase 1 (pfgch1) in Plasmodium falciparum has been linked to the upregulation of the pfdhfr and pfdhps genes associated with resistance to the antimalarial drug sulfadoxine-pyrimethamine. During the 1990s and 2000s, sulfadoxine-pyrimethamine was withdrawn from use as first-line treatment in southeast Asia due to clinical drug resistance. This study assessed the temporal and geographic changes in the prevalence of pfdhfr and pfdhps gene mutations and pfgch1 amplification a decade after sulfadoxine-pyrimethamine had no longer been widely used. A total of 536 P. falciparum isolates collected from clinical trials in Thailand, Cambodia, and Lao PDR between 2008 and 2018 were assayed. Single nucleotide polymorphisms of the pfdhfr and pfdhps genes were analyzed using nested PCR and Sanger sequencing. Gene copy number variations of pfgch1 were investigated using real-time polymerase chain reaction assay. Sequences of the pfdhfr and pfdhps genes were obtained from 96% (517/536) and 91% (486/536) of the samples, respectively. There were 59 distinct haplotypes, including single to octuple mutations. The two major haplotypes observed included IRNI-AGEAA (25%) and IRNL-SGKGA (19%). The sextuple mutation IRNL-SGKGA increased markedly over time in several study sites, including Pailin, Preah Vihear, Ratanakiri, and Ubon Ratchathani, whereas IRNI-AGEAA decreased over time in Preah Vihear, Champasak, and Ubon Ratchathani. Octuple mutations were first observed in west Cambodia in 2011 and subsequently in northeast Cambodia, as well as in southern Laos by 2018. Amplification of the pfgch1 gene increased over time across the region, particularly in northeast Thailand close to the border with Laos and Cambodia. Despite the fact that SP therapy was discontinued in Thailand, Cambodia, and Laos decades ago, parasites retained the pfdhfr and pfdhps mutations. Numerous haplotypes were found to be prevalent among the parasites. Frequent monitoring of pfdhfr and pfdhps in these areas is required due to the relatively rapid evolution of mutation patterns.

Wild gardening as a sustainable intensification strategy in northwest Cambodian smallholder systems

Within the last decade, Sustainable Intensification (SI) has emerged as a strategy to respond to future food security challenges. It incorporates increased food production without the cultivation of more land while incurring no net environmental cost. Frameworks attempting to measure SI often focus heavily on production indicators while overlooking other important indicators, such as impacts on economic, social, or human conditions. In this study, we evaluate the purposeful assemblage and management of neglected and underutilized species (NUS) in fringe areas around rural homesteads as a potential SI strategy. We use a recent SI assessment framework developed by the Feed the Future Innovation Lab for Collaborative Research on Sustainable Intensification (SIIL) that incorporates five measurable domains (productivity, economic, environmental, human condition, and social). We present findings from a qualitative case study in northwest Cambodia to assess local conceptu­alization of wild gardening, current uses of NUS, perceived benefits and challenges to their use and management, and the potential of wild gardening as a SI strategy. The qualitative methods employed 65 key informant interviews and four focus group discussions with both men and women partici­pants. Our results indicate that wild gardening is an important component of rural livelihoods in northeast Cambodia. However, a general lack of knowledge of strategic benefits, such as nutrition poten­tial, inhibits its use for maximum benefits. Wild gardening addresses multiple SI domains simultaneously and demonstrates the potential to be a promising SI strategy for improving rural livelihoods in Cambodia.

Contesting land grabs, negotiating statehood: the politics of international accountability mechanisms and land disputes in rural Cambodia

In Cambodia, rural citizens embroiled in protracted land grabbing cases with the state and private companies are turning increasingly to international accountability mechanisms for resolution. This article applies the interlinked concepts of hybrid governance and legal pluralism to understand the prospects and limitations of ‘forum-shopping’ through appeals to international mechanisms for rural communities affected by land grabs. Drawing on interviews and using process tracing, it examines the outcomes of a mediation case filed with the International Finance Corporation’s Compliance Advisor/Ombudsman (CAO) involving indigenous groups and a Vietnamese rubber company in north-east Cambodia. It argues that while international accountability mechanisms yield platforms for dispossessed groups to assert claims, they also reify choices between entitlements and attainability without circumventing the problems associated with justice delivery under Cambodia’s authoritarian regime. Overall, this study highlights the interaction, competition and collaboration between distinct forms of regulatory authority exercised by national and transnational actors involved in land grabbing cases in Cambodia, demonstrating their role in ‘negotiating statehood’ by governing local claims to land.

Forest, fire & monsoon: investigating the long-term threshold dynamics of south-east Asia’s seasonally dry tropical forests

Tropical forests are the most biodiverse terrestrial ecosystems on earth, yet are particularly susceptible to future climatic and human-induced change. Identifying tipping points at which tropical ecosystems will reorganise is therefore an important research goal. Limited research within the seasonally dry tropical forests of south-east Asia means that much uncertainty exists around the resilience of these systems to future global change. This is a critical research gap because these forests should – given their physiognomic attributes, current bioclimatic envelope and the range of stressors – be very sensitive to a stable-state shift to savanna. Here we adopt a palaeoecological approach to examine the interaction between key drivers of change (decreased precipitation and heightened fire activity) and forest response over ∼4700 years though interrogation of sediment-based proxies from volcanic crater lakes within north-east Cambodia – in the core range of southeast Asia’s tropical dry forests. Our results suggest that rapidly regenerating, secondary forest taxa are important for maintaining a forested state when the landscape is subject to moderate fire and climatic disturbance. However, when these stressors are amplified, recovery and resistance traits associated with key deciduous dipterocarp forest taxa appear critical for forest stability. Notably, shifts from more closed, seasonal evergreen forest formations to more open secondary/deciduous dipterocarp formations appear reversible when the stressors are removed, suggesting that these transitions are not analogous with the difficult-to-reverse, forest-to-savanna stable state shifts that occur elsewhere in Neotropical and Afrotropical settings. Our results indicate that the resilience of south-east Asian forests to climatic forcing appears contingent on the maintenance of secondary forest, deciduous forest, and seasonal evergreen dry forest mosaics across the ecoregion. This has implications for the conservation and wise-use of mainland south-east Asia’s lowland dry forests.

Who is the community? Governing territory through the making of ‘indigenous communities’ in Cambodia

For years, the Cambodian state has signed away indigenous peoples’ land to large-scale plantations. At the same time, the state has set up an intricate titling process that would allow indigenous peoples to officially register their land and protect it against dispossession. The Bunong ethnic minority from Bu Sra in Northeast Cambodia started to engage in such a land titling process around ten years ago. When they tried to register as an ‘indigenous community’ with the Ministry of Interior, it became apparent that defining the boundaries of a community is a highly political matter. Bunong villagers, non-profit organization staff and state bureaucrats all engaged in politics of ‘community’ and space-making in this ongoing struggle over territory.Arguing that the process of recognition of community and territory is strongly contested and involves contrasting ontologies of community, place and belonging, I focus on the incommensurability between Bunong notions of legitimate claimants/claims and actual titled communities and territories that legalization produced. I give ethnographic evidence of generational power dynamics, NGO involvement and fraught mapping processes by drawing on concepts of hegemony, consent and refusal. Problematizing the making of indigenous communities for the sake of titling, I discuss the practical and theoretical implications of this process of recognition.

Lithogeochemistry of Intrusive Rocks in the Halo Porphyry Copper-Molybdenum Prospect, Northeast Cambodia

The Halo copper-molybdenum prospect is a porphyry system in Ratanakiri province, northeastern part of Cambodia. There is only one research was carried out on this prospect about geological mapping and short wave infrared (SWIR) spectroscopy on alteration mineral identification. The purpose of this research is to confirm the deposit type from previous Angkor Gold’s report and find the centre of porphyry deposit based on characteristic of intrusive rocks at surface and subsurface, characteristics of the intrusive rocks and alteration lithogeochemistry of intrusive and volcanic rocks by using Pearce Element Ratio (PER) analysis. PER analysis was used to examine the nature and extend of the alteration halos in the porphyry Halo copper-molybdenum prospect. The intrusive rocks and volcanic rocks in Halo, range from diorite to granite (quartz feldspar porphyry) in composition as well as dacite to trachyandesite (andesite porphyry) in composition, respectively. They were formed in a subduction-related tectonic setting, likely a volcanic arc. Trace elements spider diagrams were normalized to primitive mantle display strong enrichment in large-ion lithophile elements such as Rb, Ba and K and depletion in some high-field strength elements such as Nb and Ti, suggesting magmas generated in a subduction-related tectonic setting. PER analysis indicates a moderate to high degree of sericite alteration of dacites, quartz feldspar porphyries, andesite porphyries and granodiorite porphyries. Moreover, three alterations in the Halo prospect such as potassic (secondary K-feldspar and biotite), phyllic (sericite) and propylitic (epidote) alteration were identified, which are consistent with petrography analysis. The potassic alteration zone is vectoring center of the hydrothermal system which may represent the locus of mineralization. Therefore the geochemical signature of potassic alteration within the quartz feldspar porphyry, andesite porphyry and granodiorite porphyry with high grad of copper ranges up to 2670 ppm and molybdenum ranges up to 5297 ppm represents a character for further exploration in the Halo porphyry copper-molybdenum prospect.

Impact of Government Policies and Corporate Land Grabs on Indigenous People’s Access to Common Lands and Livelihood Resilience in Northeast Cambodia

Cambodia has become a principal target of transnational (and domestic) land grabs over the past decade, mostly in the form of economic land concessions (ELCs). The northeastern part of the country—where the majority of Cambodia’s indigenous people reside—is a particular hotspot. In this article, we discuss three policy mechanisms that the Cambodian government has employed to extend and legitimize land exclusions in the name of national economic development through the example of two indigenous villages in Srae Preah Commune, Mondulkiri Province. First, we show how the allocation of two ELCs has deprived indigenous communities of their communally managed land. Second, we examine how communal land titling processes have failed to provide indigenous villagers with effective legal mechanisms to counteract ELCs and land encroachment by internal migrants. Third, we elucidate how the promotion of cash crop production contributed to livelihood and land use transitions from a reliance on forest resources in 2003 to a dependence on cash crops in 2012 to a struggle to remain resilient amid a slump in crop prices in 2018. We conclude that the combination of these policies has undermined communal ownership and livelihood resilience under a situation of limited exit strategies.

Large-Scale Land Concessions, Migration, and Land Use: The Paradox of Industrial Estates in the Red River Delta of Vietnam and Rubber Plantations of Northeast Cambodia

This study investigated the implications of large-scale land concessions in the Red River Delta, Vietnam, and Northeast Cambodia with regard to urban and agricultural frontiers, agrarian transitions, migration, and places from which the migrant workers originated. Field interviews conducted near large-scale land concessions for industrial estates in the Red River Delta and rubber plantations in Northeast Cambodia suggest that these radically different concessions are paradoxically leading to similar reconfigurations of livelihoods, labor patterns, and landscapes despite basic differences in these forms of land use. Both the Red River Delta and Northeast Cambodia are frontier environments undergoing extensive agrarian change with migration to work in the large-scale land concessions leading to a shortage of farm labor that anticipates changes in farming practices and farm livelihoods. These population movements will lead to further land-use changes as governments invest in the infrastructure and services needed to support increased population density in the receiving areas. In addition, labor migrations associated with these investments affect land-use practices both at the site of the concession and the places from where the migrants originate.

Frédéric Bourdier, Maxime Boutry, Jacques Ivanoff, and Olivier Ferrari. From Padi States to Commercial States: Reflections on Identity and the Social Construction Space in the Borderlands of Cambodia, Vietnam, Thailand and Myanmar

From Padi States to Commercial States: Reflections on Identity and the Social Construction Space in the Borderlands of Cambodia, Vietnam, Thailand and Myanmar Frederic Bourdier, Maxime Boutry, Jacques Ivanoff, and Olivier Ferrari Amsterdam: Amsterdam University Press, 2015, 168pp.The case studies in this book encompass the utilization of, and an extension of, James Scott's concept. Deriving from anthropological works that focus on the adaptation strategies of the border population (p. 15), the book focuses on the enactment of alternative histories and (borderland) societies well on a revisiting of contemporary state-society relations, borrowing from the concept of Zomia. The authors add to the debates regarding Scott's Zomia, in their words de-territorialize (p. 15) the concept of Zomia and focus on the Inner Zomians, defined cast-out and widely dispersed migrants, modern resisters residing within ethno-national borders (p. 15).The argument is that even though Zomia territory has been penetrated by the emergence of a based on a paddy cash crop economy that serves a system of statehood where rice-farming constitutes the basis of power (p. 16), the post-colonial structures of control remain partial (p. 16). This can be seen in the cultural and economic exchanges well social and ethnic dynamism established between the commercial state and the Zomia communities.To be more precise, the quote on page 24 narrates the main focus of the book:. . . the modalities of the implementation of identities and the transformation of the interethnic relations provoked by development . . . starting from the center, reconfigure a Zomian reality that remains geographically hard for the center to access and exploit . . . we are attempting to understand the strategies that have been developed by the populations who are no longer external to the state and have become integrated, but who still remain externalized, either through their own will or through the state's paradoxical discourse resulting from a desire to integrate these groups without putting an end to stigmatization. (p. 24)The chapters celebrate the creativity and adaptability of the (inner) Zomians and address the questions of domination, resistance, and resilient acts through the politics of ethnic identification and construction. Despite the encroachment of the nation-states' developmental programs-some have even penetrated into Zomia territory and have impacted the socioeconomic development of minorities-the political economy of the borderlands operates as an element of reflection for our complementary understanding of a socio-cultural that cannot be restricted to a geographical landscape (p. 16) but arguably extends to cultural (ethnicity, religion, ideology) of the Inner Zomian . . . that is not only ethnic . . . but also socio-ethnic (p. 18).The book does not limit itself to locating resistance, or the processes of not-being-governed (Scott 2009), between two opposite categories such ethnic/minority groups versus the state, but the within the group, coupled with their appropriative capabilities to adapt to differences and survive through the creation of new ethnic identities within the nation-state system.The inner Zomia refers to the particular strata (p. 2) within the populations and other territorial groups-namely, the Jarai of Cambodia (Chapter 2), Chinese entrepreneurs or taukays and migrants (Chapter 3), the Moken or sea-gypsies (Chapter 4), and the minority groups of Moklen and Urak Lawoi vis-a-vis the dominant populations of Thai, Sino-Thai, and Malay Muslims (Chapter 5)-that move and flow between the dual dynamics either in their relationship with the state or with other minorities (p. 18).In Chapter 2, Frederic Bourdier's analysis locates the infinity of ethnic identity of the hill people and the resilience of Zomia in the borderland of northeast Cambodia despite the penetration of states activities. …

Whose Reality Counts? Critical Junctures in Livelihood Trajectories Under Deforestation

AbstractLivelihoods approaches focus on the poor and their knowledge and agency, but risk underplaying broader contextual forces which constrain and shape that agency. Livelihood trajectories approaches attend more fully to these structural, contextual dynamics. A three‐year study using quantitative and qualitative methods investigated livelihood trajectories over two decades in a village affected by deforestation in Northeast Cambodia, and sought to identify critical junctures structuring those trajectories. A timber rush, a land rush, a turn to agriculture and ongoing competition to shape post‐forest reterritorialisation were identified as the critical junctures. These transformed the physical environment, and initiated waves of migration which in turn transformed the social and economic structure and everyday life of the village. This valuably disrupts narrative simplifications associated with community forestry. The junctures furthermore suggest an analytical framework for understanding deforestation‐livelihoods dynamics in other contexts, thus demonstrating how livelihood trajectories research might contribute to middle‐level theory building.

Natural remedies used by Bunong people in Mondulkiri province (Northeast Cambodia) with special reference to the treatment of 11 most common ailments

Ethnopharmacological relevanceIn this paper we present a comprehensive ethnomedicinal study conducted in Mondulkiri province. Traditional knowledge about natural medicine (plants, animals, mushrooms) was investigated in Cambodia’s largest indigenous community: the Bunong people. The survey aims to document the medicinal plant use of this ethnic, by focusing on the eleven most frequent diseases encountered in the area, in order to highlight species that could be recommended in public health programs. Materials and methodsDuring the years 2013 and 2014, 202 villagers were interviewed in 28 villages from the five districts in Mondulkiri. Two types of methodology were employed: (1) an ethnobotanical field survey (walk-in-the-wood interviews) and (2) semi-structured household interviews with a special emphasis on the treatment of 11 most common ailments encountered in the area. Medicinal plants and mushrooms were collected and identified together with medicinal animals. The factor informant consensus (FIC) and fidelity level (FL) were calculated. ResultsBunong people use a total of 214 plants belonging to 72 families, 1 mushroom and 22 animal species in their traditional healthcare practices in order to treat 51 different ailments. Among the medicinal plants, Fabaceae was the most predominant family; Chromolaena odorata (L.) R.M. King and H.Rob. (Asteraceae), Zingiber montanum (J.Koenig) Link ex A.Dietr. (Zingiberaceae) and Kalanchoe pinnata (Lam.) Pers. (Crassulaceae) were the most cited medicinal plants; and four ailments (cold/fever, diarrhea, postpartum disorders and stomachache) were described as major ailments in the community. The root was the most important part of plants used, and decoction was the most cited method of preparation. During our survey, we also discovered a “new to science” plant species called Ardisia mondulkiriensis Hul and Chassagne, and we recorded for the second time the plant species recently described, Solanum sakhanii Hul. ConclusionMost of the species reported for the treatment of the 11 most frequent ailments have already been proven to be efficient and safe. Furthermore, 10 plant species are reported for the first time as medicinal and some of them are widely used in the community. Further pharmacological and phytochemical investigations should be undergone to assess the pharmaceutical potential of these species.While undergoing considerable changes, Bunong people have maintained extensive traditional medicine knowledge. As this indigenous hill tribe depend mainly on natural remedies for their daily healthcare, environmental preservation is of high importance for the community.

Identities beyond ethnic-based subordination or conflict in the Southeast Asian borderlands: a case study of Lao villagers in northeast Cambodia

This paper explores everyday expressions of identity by Lao villagers living in northeast Cambodia near the border with Laos, and uses this to reflect on trends in studies of identity in the remote borderlands of Southeast Asia. I argue that while ethnicity is certainly crucial, discipline-specific emphases – ethnic-based subordination or conflict for social studies and political studies, respectively – result in less attention to other important dynamics shaping identity. Furthermore, I suggest that low-profile case studies not strongly linked to ethnic-based subordination or conflict – such as the Lao in Cambodia – require study for a more comprehensive view of identity in the borderlands. The case study from northeast Cambodia identifies four key dynamics shaping identity: inter-state relations, ethno-national identities, cross-border livelihoods and social status. I show how minimal inter-state tensions and varied personal connections to Laos were important in facilitating villagers’ involvement in lucrative illegal cross-border logging in Laos, but the latter were never used to justify this practice. Instead in this everyday setting, villagers emphasised their sense of marginalisation within Cambodia and thus demonstrate their regular prioritisation of status.

Characterizing Types of Human Mobility to Inform Differential and Targeted Malaria Elimination Strategies in Northeast Cambodia.

Human population movements currently challenge malaria elimination in low transmission foci in the Greater Mekong Subregion. Using a mixed-methods design, combining ethnography (n = 410 interviews), malariometric data (n = 4996) and population surveys (n = 824 indigenous populations; n = 704 Khmer migrants) malaria vulnerability among different types of mobile populations was researched in the remote province of Ratanakiri, Cambodia. Different structural types of human mobility were identified, showing differential risk and vulnerability. Among local indigenous populations, access to malaria testing and treatment through the VMW-system and LLIN coverage was high but control strategies failed to account for forest farmers’ prolonged stays at forest farms/fields (61% during rainy season), increasing their exposure (p = 0.002). The Khmer migrants, with low acquired immunity, active on plantations and mines, represented a fundamentally different group not reached by LLIN-distribution campaigns since they were largely unregistered (79%) and unaware of the local VMW-system (95%) due to poor social integration. Khmer migrants therefore require control strategies including active detection, registration and immediate access to malaria prevention and control tools from which they are currently excluded. In conclusion, different types of mobility require different malaria elimination strategies. Targeting mobility without an in-depth understanding of malaria risk in each group challenges further progress towards elimination.

Injections, Cocktails and Diviners: Therapeutic Flexibility in the Context of Malaria Elimination and Drug Resistance in Northeast Cambodia

BackgroundAdherence to effective malaria medication is extremely important in the context of Cambodia’s elimination targets and drug resistance containment. Although the public sector health facilities are accessible to the local ethnic minorities of Ratanakiri province (Northeast Cambodia), their illness itineraries often lead them to private pharmacies selling “cocktails” and artemether injections, or to local diviners prescribing animal sacrifices to appease the spirits.MethodsThe research design consisted of a mixed methods study, combining qualitative (in-depth interviews and participant observation) and quantitative methods (household and cross-sectional survey).ResultsThree broad options for malaria treatment were identified: i) the public sector; ii) the private sector; iii) traditional treatment based on divination and ceremonial sacrifice. Treatment choice was influenced by the availability of treatment and provider, perceived side effects and efficacy of treatments, perceived etiology of symptoms, and patient-health provider encounters. Moreover, treatment paths proved to be highly flexible, changing mostly in relation to the perceived efficacy of a chosen treatment.ConclusionsDespite good availability of anti-malarial treatment in the public health sector, attendance remained low due to both structural and human behavioral factors. The common use and under-dosage of anti-malaria monotherapy in the private sector (single-dose injections, single-day drug cocktails) represents a threat not only for individual case management, but also for the regional plan of drug resistance containment and malaria elimination.

Nutrient balances for cassava cultivation in Kampong Cham province in Northeast Cambodia

In Cambodia, cassava is mostly grown with little or no fertilizer inputs, but the magnitudes of nutrient balances are not known. This study was conducted to assess nutrient balances for cassava cultivation in Kampong Cham province in Northeast Cambodia. Forty five households in four cassava production zones were interviewed in relation to their cultural practices and crop residue management, upon which sources of nutrient inputs and outputs were based. Chemical fertilizer, manure, planting materials and rainfall were the defined inputs, while cassava roots and stumps were the outputs. Crop cutting was undertaken in the cassava fields of the 45 households to obtain weights of roots and other plant parts. Nutrient balances were calculated for the individual fields based on nutrient contents of the component sources obtained from the literatures. The results showed negative balances for all the nutrients evaluated. The imbalances were most serious for N, K and Ca with the averages of -64.45 kg N, -52.83 kg K and -10.83 kg Ca ha -1 , but were less serious for P and Mg with the averages of -2.85 kg P and -7.20 kg Mg ha -1 . These negative balances were the consequence of low nutrient inputs in current practices where only a few farmers applied low rates of chemical fertilizer or manure. Continued use of current practices will threaten the sustainability of cassava production in Cambodia. For long term productivity of the crop, the application of organic manures together with lime and chemical fertilizers high in N and K is recommended.

Irrawaddy dolphin demography in the Mekong River: an application of mark–resight models

Riverine Irrawaddy dolphin populations are critically endangered and much uncertainty exists over the population status in the Mekong River of northeast Cambodia and southern Lao People's Democratic Republic (Lao PDR). We conducted 11 surveys over three years to estimate abundance at each survey as well as survival and the probability of individuals becoming unavailable for detection between surveys. We utilized novel mark–resight estimators to account for the detection process in estimating these parameters. Annual survival was 0.977 (0.040 SE) and movement in (0.060) and out (0.018) of an observable state was low. We estimated abundance at 84.5 (95% CI = 77.9–91.2) with little change over our surveys. We also estimated recruitment and population growth rate for the marked, and presumably older, individuals by estimating seniority using a reverse-time model. Seniority was estimated at 0.999 (0.028 SE), recruitment at 0.001 and population growth rate at 0.978. Although the population size appears to be stable, we believe this represents the slow disappearance of a long-lived animal with no recruitment. Along with the isolated nature of the population and reduced population size as compared to historical estimates, we believe this population is in serious threat of extirpation. We believe there may be as few as 7 or 8 animals in Lao PDR and that the species is at risk of extinction there in the short-term. Although recent management actions (e.g., outlawing of explosive fishing and some restriction on the use of gill-nets) have likely been beneficial we believe identifying population goals to work towards, identifying additional management actions to improve recruitment, and designing the survey methods to best estimate the success of these actions is needed.

A comparative study of crested gibbons (Nomascus)

Crested gibbons (Nomascus) are in the rarest genus of the family Hylobatidae, with the Hainan gibbon (Nomascus hainanus) being the rarest primate in the world. In the past, the number of species in this genus has been at the center of much controversy, in part, because their color changes during immaturity as well as other factors, such as physical similarities in genitalia, creating difficulties in accurately determining the sex of individuals. Furthermore, owing to their rarity, illusiveness, and the rough terrain that comprises their native habitat, Nomascus is one of the least studied Hylobatidae. This article represents the most comprehensive dissemination of visual characteristics of the genus Nomascus to assist in the accurate identification of captive and wild crested gibbons. Through differences in pelage color, skeletal anatomy, dentition, vocalizations, behavior, distribution, and genetic studies, we are able to determine more accurately whether or not a subspecies should be elevated to species level. From the current data, there are six species and one subspecies in the genus Nomascus. However, reports of a recently identified light-cheeked gibbon (Nomascus sp.) in northeast Cambodia, Central Vietnam, and South Lao PDR, will add additional taxa to this genus.

カンボジア北東部ラタナキリと首都プノンペン周辺の酒と発酵食品

カンボジア北東部ラタナキリと首都プノンペン周辺の酒と発酵食品