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This reappraisal of Political Systems of Highland Burma, the seminal work by E.R. Leach, presents much new material on the highlands of Southeast Asia and its borders from writers with long-term research experience in these areas. The Introduction establishes in detail both the theoretical and regional ethnographic significance of Leach's work and the chapters to follow. Part One discusses issues relating to Leach's fieldwork, including the background to his research and issues arising from his fieldwork practice. Part Two presents a variety of engagements with Leach's theoretical approach, particularly his ideas of socio-political oscillation. This theory is considered in relation to the historical experience of culture contact in Assam and Laos, particularly between Tai and non-Tai groups. Part Three considers once more Leach's ideas with respect to communities that are, or could be considered, Kachin sub-groups in Burma, Tibet and Yunnan, this time focusing on interpretations of exchange and the notion of ritual language. A discussion of approaches towards the study of transethnicity concludes the work. The book is a significant contribution to the development of a new regional anthropology of Southeast Asia, incorporating material from areas that were, until recently, closed to researchers.

Pha Taem in Luang Prabang Province, northern Laos, is a cliff face overlooking the Ou River with over 300 red pictograms, mostly hand prints, anthropomorphs, zoomorphs, and others interpreted as 'hunting scenes' and 'boats'. One local interpretation of the site is as a commemorative scene for hunting animals, which took place on the opposite river bank. Interestingly, the motifs depicted on the wall have similarities with cliff paintings at the Pak Ou Caves some 70 km downstream. The physical connection of the two sites along the same river raises the possibility of locating more rock art sites along the Mekong and the Ou River and underscores the role of rivers as lines of communication in this mountainous environment.

Based on multiple datasets and different methods, this manuscript objectively determined the rainy season onset (RSO) over the Southeast Asia Low-Latitude Highlands (SEALLH) and investigated the relationship between RSO and spring drought. The RSO date is defined as the minimum of the rainfall departure over the SEALLH, with a mean value of 11 May and a standard deviation of 15 days. The RSO demarcates the transition between the dry and wet seasons, which is an effective indicator of the sudden emergence of rainfall and convection over the SEALLH. A delayed RSO is characterized by a reduction in April-May rainfall, accompanied by low-level divergence, descending motion and adiabatic warming, decreased cloud cover and increased solar radiation. Consequently, a delayed RSO is frequently associated with spring drought over the SEALLH due to the resulting water deficiency, warmer temperature, and increased evaporation.

Most intensive human activities occur in lowlands. However, sporadic reports indicate that human activities are expanding in some Asian highlands. Here we investigate the expansions of human activities in highlands and their effects over Asia from 2000 to 2020 by combining earth observation data and socioeconomic data. We find that ∼23% of human activity expansions occur in Asian highlands and ∼76% of these expansions in highlands comes from ecological lands, reaching 95% in Southeast Asia. The expansions of human activities in highlands intensify habitat fragmentation and result in large ecological costs in low and lower-middle income countries, and they also support Asian developments. We estimate that cultivated land net growth in the Asian highlands contributed approximately 54% in preventing the net loss of the total cultivated land. Moreover, the growth of highland artificial surfaces may provide living and working spaces for ∼40 million people. Our findings suggest that highland developments hold dual effects and provide new insight for regional sustainable developments. Most of the intensive human activities usually occur in lowlands. Here the authors report that human activity expansions also were widely distributed in Asian highlands in the 21st century and held dual effects, which provides new insights for regional human activity expansions.

This study investigated the covariation of thermal conditions of the Southeast Asian low-latitude highlands (SEALLH) and variability of the summer East Asia–Pacific (EAP) or Pacific–Japan (PJ) teleconnection pattern using ERA5 reanalysis data and numerical experiments. Statistical analysis and physical diagnosis show that the EAP/PJ teleconnection pattern is significantly related to the seesaw mode of diabatic heating over the SEALLH in summer on the interannual time scale. When enhanced diabatic heating occurs over the central–northern SEALLH with weakened diabatic heating over the southern SEALLH, anomalous easterly and westerly winds, fitting the quasi-geostrophic theory, appear over the southern and central–northern SEALLH, receptively. These anomalous winds are propitious to the EAP/PJ teleconnection pattern in the “+, −, +” phase from the western North Pacific to northeast Asia. Once a significant relationship has been established in late spring, it can persist through to the following summer. Sensitivity experiments identified the key physical process linking the variability of the thermal conditions over the SEALLH to the summer EAP/PJ teleconnection pattern on an interannual time-scale.

Global economic change and policy interventions are driving transitions from long-fallow swidden (LFS) systems to alternative land uses in Southeast Asia's uplands. This study presents a systematic review of how these transitions impact upon livelihoods and ecosystem services in the region. Over 17 000 studies published between 1950 and 2015 were narrowed, based on relevance and quality, to 93 studies for further analysis. Our analysis of land-use transitions from swidden to intensified cropping systems showed several outcomes: more households had increased overall income, but these benefits came at significant cost such as reductions of customary practice, socio-economic wellbeing, livelihood options, and staple yields. Examining the effects of transitions on soil properties revealed negative impacts on soil organic carbon, cation-exchange capacity, and aboveground carbon. Taken together, the proximate and underlying drivers of the transitions from LFS to alternative land uses, especially intensified perennial and annual cash cropping, led to significant declines in pre-existing livelihood security and the ecosystem services supporting this security. Our results suggest that policies imposing landuse transitions on upland farmers so as to improve livelihoods and environments have been misguided; in the context of varied land uses, swidden agriculture can support livelihoods and ecosystem services that will help buffer the impacts of climate change in Southeast Asia.

Thailand's hill tribes have been the object of anthropological research, cultural tourism, and government intervention for a century, in large part because these groups are held to have preserved distinctive ethnic traditions despite their contacts with modern culture. Hjorleifur Jonsson rejects the conventional notion that the worlds of traditional peoples are being transformed or undone by the forces of modernity. Among the Mien people of northern Thailand he finds a complex highlander identity that has been shaped by a thousand years of interaction in a multiethnic contact zone. In Mien Relations, Jonsson suggests that as early as the thirteenth century, the growing influence of Chinese and Thai state authority had led to a peculiarly urban understanding of the hinterlands—the forests and the mountains—as an area beyond state control and the rhetoric of civilization. Mountain peoples became understood as a distinct social type, an idea elaborated by government classification systems in the late nineteenth and early twentieth centuries. Their discovery by Western anthropologists is, he suggests, merely one more episode influencing Mien identity. Jonsson questions traditional ethnography's focus on fieldwork and personal observation—and its concomitant blindness to political manipulation and to historical formation. Throughout Mien Relations, he revisits long-neglected connections between China and Southeast Asia, combines ancient history and contemporary ethnography, engages with the serious politics of representation without abandoning the quest to write ethnographically about particular communities, and keeps state control in view without assuming its success or coherence.

Integrated analyses using maximum likelihood (ML), Bayesian inference (BI), principal component analysis (PCA), discriminate analysis of principal components (DAPC), multiple factor analysis (MFA), and analysis of variance (ANOVA) recovered two new diagnosable species of gekkonid lizards in the genus Dixonius , one from the Central Highlands, Gia Lai Province, Vietnam and another from the Vientiane Province, Laos. Phylogenetic analyses based on the mitochondrial NADH dehydrogenase subunit 2 gene (ND2) and adjacent tRNAs showed that Dixonius gialaiensis sp. nov. is the sister species of D. minhlei from Dong Nai Province, Vietnam and is nested within a clade that also includes the sister species D. siamensis and D. somchanhae . Dixonius muangfuangensis sp. nov. is the sister species to D. lao from Khammouane Province, Laos and is embedded in a clade with D. vietnamensis , D. taoi , and undescribed species from Thailand. Multivariate (PCA, DAPC, and MFA) and univariate (ANOVA) analyses using combinations of 15 meristic (scale counts), six morphometric (measurements), and five categorical (color pattern and morphology) characters from 44 specimens encompassing all eight species of Dixonius from Vietnam and Laos clearly illustrate Dixonius gialaiensis sp. nov. and Dixonius muangfuangensis sp. nov. are statistically different and discretely diagnosable from all closely related species of Dixonius . These integrative analyses also highlight additional taxonomic issues that remain unresolved within Dixonius and the need for additional studies. The discovery of these new species further emphasizes the underappreciated herpetological diversity of the genus Dixonius and illustrates the continued need for field work in these regions.

This research focused on the incidence and population genetics of coffee leaf rust (CLR) fungus, Hemileia vastatrix , to estimate the possible original source(s) and subsequent migration pathways of wind-borne and human-aided spores in three main coffee production regions (Northwest, Central Highlands, and Southeast) in Vietnam. In southern Vietnam (Central Highlands and Southeast), Coffea canephora covers the majority area, while Catimor lines of C. arabica accounts for 95% of the coffee plantations in northwestern Vietnam. Field surveys conducted at eighty-five plantations, show coffee leaf samples infected by the rust fungus across forty-one plantations. Catimor varieties exhibited high levels of susceptibility with severe rust symptoms, while robusta varieties had varying degrees of susceptibility. We analyzed 863−869 base pairs of internal transcribed spacer (ITS) region from 83 samples (41 sequences from Vietnam, 2 from Thailand, and the remaining 40 from American countries); and fifty-two haplotypes consisting of 123 polymorphic sites were detected. Although the analysis of molecular variance (AMOVA) indicates significant genetic differentiation in the H. vastatrix populations in Vietnam, there was no clear genetic structure with respect to the three geographic areas surveyed. Based on the haplotype network, NeighborNet analysis, and geographical distribution patterns of the haplotypes, five haplotypes were identified as early established, from which most other haplotypes in Vietnam were derived. The early established haplotypes were found in the highest frequency in Northwest Vietnam. This finding corresponds to the earliest record of CLR in Vietnam. The phylogenetic network analysis also illustrated that H. vastatrix had expanded from the northwest to southern Vietnam. Pairwise genetic distance analysis and the geophylogenetic tree also suggests that CLR was first established in the Northwest. In addition, some scattered individuals on the principal coordinate analysis (PCoA) diagram and several separated haplotypes in the phylogenetic networks indicated that other branches of CLR in Vietnam were initiated in the Central Highlands. Hemileia vastatrix from these branches have been spreading in southern Vietnam.

PREMISE OF THE STUDY: Spermacoceae are mainly an herbaceous group in the Rubiaceae. However, a few lineages are woody and are found in a diverse range of habitat types. Three of the largest woody lineages (Arcytophyllum, Hedyotis, and Kadua) are characterized by their distribution in the moist tropical mountains and have disjunct distribution patterns with respect to their closest relatives. In this study, we explore the cases of derived woodiness in these three lineages and their diversification dynamics in the tropical mountains of Asia, the Pacific, and the Americas. METHODS: By combining phylogenetic results with wood anatomical studies, we estimated timing of origin of the three woody groups, inferred their ancestral traits and ancestral distribution ranges, analyzed their associations with the tropical upland habitat, and elucidated their diversification across tropical mountains. KEY RESULTS: The three woody clades originated and diversified from herbaceous ancestors in close association with the tropical upland habitat during the Miocene. The ancestral range for Asian‐Pacific Hedyotis is Africa/Madagascar and continental Asia for Pacific Kadua. The complex geological history of tropical Asia allowed Hedyotis to diversify faster and create narrow endemics near oceans in the highlands of the Western Ghats in India, Sri Lanka, Southeast Asia including southeastern China, and New Guinea. CONCLUSIONS: The three major woody clades in Spermacoceae have gained their woodiness independently from one another, subsequent to colonization by their ancestors from a different geographic environment. The evolution and diversification along the tropical mountain orogeny is strongly linked with the formation of woody habit and many narrow endemic species.