Island Southeast Asia Research Articles

Effect of Biomass Burnings on Population Exposure and Health Impact at the End of 2019 Dry Season in Southeast Asia

At the end of the dry season, from early March to early April each year, extensive agricultural biomass waste burnings occur throughout insular mainland Southeast Asia. During this biomass-burning period, smoke aerosols blanketed the whole region and were transported and dispersed by predominant westerly and southwesterly winds to southern China, Taiwan, and as far southern Japan and the Philippines. The extensive and intense burnings coincided with some wildfires in the forests due to high temperatures, making the region one of the global hot spots of biomass fires. In this study, we focus on the effect of pollutants emitted from biomass burnings in March 2019 at the height of the burning period on the exposed population and their health impact. The Weather Research Forecast-Chemistry (WRF-Chem) model was used to predict the PM2.5 concentration over the simulating domain, and health impacts were then assessed on the exposed population in the four countries of Southeast Asia, namely Thailand, Laos, Cambodia, and Vietnam. Using the health impact based on log-linear concentration-response function and Integrated Exposure Response (IER), the results show that at the peak period of the burnings from 13 to 20 March 2019, Thailand experienced the highest impact, with an estimated 2170 premature deaths. Laos, Vietnam, and Cambodia followed, with estimated mortalities of 277, 565, and 315 deaths, respectively. However, when considering the impact per head of population, Laos exhibited the highest impact, followed by Thailand, Cambodia, and Vietnam. The results highlight the significant health impact of agricultural waste burnings in Southeast Asia at the end of the dry season. Hence, policymakers should take these into account to design measures to reduce the negative impact of widespread burnings on the exposed population in the region.

Unraveling the Maintenance of Southeast Asia Maritime Security; A Look into the ASEAN Maritime Outlook

The sea is an important engine of development for the growth of Southeast Asia. It has provided the states with new opportunities for growth and development. It is not surprising that many initiatives have been undertaken to leverage the vast sea in the region. Under Indonesia’s chairmanship, ASEAN’s focus towards the maritime domain was accentuated by the release of the ASEAN Maritime Outlook (AMO). This new addition to ASEAN’s maritime security instruments serves as a reference for upcoming endeavors on the field and to avoid duplication. Through using the qualitative research methods, the author seeks to explore the ways ASEAN has sought to maintain its multifaceted maritime security. Against that backdrop, apart from elaborating what the AMO has to offer, the author also unravels the strides ASEAN has taken in maintaining some dimensions to its maritime security. The aforementioned dimensions, referring to Christian Bueger, consisted of national security, human security, marine environment, and economic development. It is found how ASEAN’s effort to maintain maritime security is apparent in the initiatives done within its 3 pillars. Moreover, ASEAN also expands its effort by cooperating with actors outside of Southeast Asia in many aspects given the interconnectedness inherent to the sea. Based on the conclusion, it is recommended that ASEAN continues to prioritize and enhance its multifaceted approach to maritime security, building on the foundations laid by the ASEAN Maritime Outlook (AMO). ASEAN should intensify efforts to strengthen national security, human security, marine environment protection, and economic development through its three pillars: Political-Security Community, Economic Community, and Socio-Cultural Community. To further bolster these initiatives, ASEAN should deepen its cooperation with external partners, leveraging the interconnected nature of the maritime domain.

ASEAN, and Indonesia’s Rising Influence In The Region

When one looks at the world map, Indonesia is not really visible in a very obvious manner, due to it being an archipelago, scattered over thousands of islands in South East Asia. However, when one reads into it, they realize that it is actually the fourth most populous country on earth, and holds quite a bit of diplomatic power as well. Indonesia is one of the founding members of ASEAN, the Association of South-East Asian Nations. ASEAN houses major natural resources, a huge chunk of Earth’s population, and together, the 10 ASEAN member states form one of the busiest trade routes in the world. To keep it simple, ASEAN is a really important organisation, and Indonesia, being one of the founding members, as well as the largest country in it, acts as the de-facto leader. Unfortunately, Indonesia is prone to many natural disasters due to its unfortunate geographic location, smack in the Pacific Ring of Fire. Recent major disasters have weakened Indonesia’s position, and many countries now do not consider Indonesia as the de-facto leader of ASEAN. This research focuses on Indonesia’s rise and fall as the undisputed leader of ASEAN, and what the future holds in store for Indonesia. To conduct this research, numerous research papers have been referred to and cited, as well as fresh information has been collected on a primary data basis. The primary data is collected by interviewing 15 Indonesian citizens, as well as senior officials at the Consulate General of Indonesia, Mumbai. Thus, the research presents the observations derived from interviewing two sides, the perspective of the Indonesian citizens, as well as the perspective of the Indonesian government. The research aims to answer some questions such as if Indonesia is prepared to tackle the current and future issues arising in ASEAN, being the leader. The research goes a step further to figure out if the Pacific Ring of Fire affects the geopolitics of Indonesia, and finally, the research looks at if the Indonesian government, and their people, the citizens look eye to eye? All of the interviews of the Indonesian citizens have been conducted virtually via Google Forms, and a meeting at the Consulate was set up in Mumbai to get the government’s perspective.

Profiling genetically driven alternative splicing across the Indonesian archipelago.

One of the regulatory mechanisms influencing the functional capacity of genes is alternative splicing (AS). Previous studies exploring the splicing landscape of human tissues have shown that AS has contributed to human biology, especially in disease progression and the immune response. Nonetheless, this phenomenon remains poorly characterized across human populations, and it is unclear how genetic and environmental variation contribute to AS. Here, we examine a set of 115 Indonesian samples from three traditional island populations spanning the genetic ancestry cline that characterizes Island Southeast Asia. We conduct a global AS analysis between islands to ascertain the degree of functionally significant AS events and their consequences. Using an event-based statistical model, we detected over 1,500 significant differential AS events across all comparisons. Additionally, we identify over 6,000 genetic variants associated with changes in splicing (splicing quantitative trait loci [sQTLs]), some of which are driven by Papuan-like genetic ancestry, and only show partial overlap with other publicly available sQTL datasets derived from other populations. Computational predictions of RNA binding activity reveal that a fraction of these sQTLs directly modulate the binding propensity of proteins involved in the splicing regulation of immune genes. Overall, these results contribute toward elucidating the role of genetic variation in shaping gene regulation in one of the most diverse regions in the world.

Milk Culture in Insular Southeast Asia Recognized as a Non-milk Cultural Sphere

The issues of milk processing techniques and milk use in areas considered outside the milk cultural sphere is an extremely significant case study for analyzing the transmission and transition of culture. The purpose of this paper is to (1) identify the areas where milk culture is practiced in Insular Southeast Asia, (2) analyze the characteristics of milk processing techniques and milk uses, and (3) examine the origins and transitions of milk culture based on the results of the authors’ fieldwork and literature surveys. Nakao’s model was used to categorize the milk processing techniques and to analyze those characteristics. The characteristics of milk products in the Philippines and Indonesia are that milk products are produced mainly as a source of cash income from sales and consumed as nutritional supplements and luxury foods, not as essential subsistence foods. When milk culture was transferred to both countries from the milk cultural sphere where milk products are essential for a dairy diet, the abundant availability of plant and marine foods may have caused the lack of most milk processing techniques and the transition of milk products from essential subsistence foods to supplementary luxury foods. The Philippines adopts additive coagulation processes, while Indonesia adopts fermentation, heat condensation, and additive coagulation processes. This localized mosaic of milk processing techniques is a characteristic of milk culture in Insular Southeast Asia. This paper discovered that milk culture has spread to Insular Southeast Asia, but identical milk processing techniques were not widely shared in areas where milk culture was not an essential cultural element in local livelihoods. It is concluded that milk culture in the Philippines started with the influence of Spain and was subsequently modified under the influence of India and China, while milk culture in Indonesia originated under the influence of India.

A description of lineage 1 Mycobacterium tuberculosis from papua, Indonesia

Indonesia has the third highest number of tuberculosis (TB) patients infected with Mycobacterium tuberculosis (MTB) Lineage 1 (L1). Most of these MTB L1 cases can be found in Indonesia's remote easternmost province of Papua, one of Indonesia's most underdeveloped provinces with a particularly high burden for TB. In this study, we sequenced and described 42 MTB L1 isolates from a well-characterized cohort of patients. We found a genetically diverse MTB L1 population with no association between pathogen genetic relatedness and place of residence or pathogen genetic relatedness and patient ethnicity, which could reflect mixing between different locales and ethnicities or our low sampling fraction. Only a small number showed genetic variants associated with drug resistance (5/42, 11.9 %), probably due to a lack of effective treatment programs. The Papuan isolates showed similarities to other Island Southeast Asian Countries due to the high proportion of L1.2.1.2.1 (30/42, 71.4 %), especially East Timor and the Philippines. This study fills a research gap of MTB L1 in Indonesian Papua and should serve as a stepping stone for further research in the region.

Global analysis of forest tipping points leading to changing water cycle dynamics

Forest cover loss is increasing at unprecedented rates, affecting the hydrologic systems of major freshwater-producing regions of the world. However, quantification of the tipping points of forest cover loss before hydrologic changes manifest and their impact in water yield and climatic conditions has remained elusive. In this study, we aim to systematically document the critical thresholds of tree cover loss leading to changing hydrologic functioning within regions that experienced extensive drought, fire, or clear-cutting events spanning different climates during the period from 2001 to 2016. Using the Hydrologic Sensitivity Index based on Budyko’s curve, we analyzed the changes in hydrologic responses to climate variability as landcover changes across the affected forests. Critical thresholds were derived by fitting Richard’s Curve function to the observed relationship between growing sensitive area and tree cover loss. Our analysis reveals decrease in water yields and warming trends during the early stages of tree cover loss in tropical forests (c = 16 %), with negative anomalies observed in rainforests of Central Africa and Maritime Southeast Asia. Boreal forests also show low thresholds (c = 18 %) with a strong tendency toward a warmer climate state and no clear tendency in water yields. Mixed forests show moderate thresholds (c = 25 %) with unclear water yield and climate trends. Conversely, Temperate forests exhibit the most resilience to hydrologic regime shifts with high critical thresholds of tree cover loss (c = 46––54 %), but a rapid alteration once their threshold is surpassed resulting primarily in increased water yields and a shift toward cooler climate conditions. As the potential for additional tree cover loss heightens, due to expected increases in the frequency and intensity of droughts and wildfires, the analyses presented provides a quantitative framework to monitor and assess the impacts of changing forest cover conditions on the water cycle behavior of some of the largest freshwater producing regions of the world.

Exotic ceramics from the Murray Islands, Eastern Torres Strait

The discovery of Lapita-decorated ceramics in the Massim region and southern Papua New Guinea coast, along with finds of pottery on Jiigurru (Lizard Island) in the Great Barrier Reef and in the Torres Strait demonstrates the presence of seaborne movements in the Coral Sea as early as ∼ 2900–2500 cal. BP (Ulm et al. 2024). As an introduced Austronesian technology, ceramics are central to archaeological understandings of early maritime routes and cross-cultural relationships between Island Southeast Asians, Papuan peoples, and Indigenous Australians. In the Torres Strait only a small number of pot sherds have been reported. Those found in the western islands were probably made using local materials, while the ceramics from eastern islands have been sourced to southern Papua New Guinea (Carter 2004). In this paper, petrographic examination of sherd tempers recently recovered from the Eastern Torres Strait islands of Dauar and Waier indicate derivation from the Purari River basin in southern New Guinea. A distinct granitic temper sherd dated to ∼ 2600 cal. BP differs from known sherd tempers and likely originates from the Western Torres Strait. The provenance of this granitic sherd is consistent with the early movement of ceramic-making groups along the south New Guinea coast and into the Torres Strait, and with the ability of these groups to make long-distance passages in the Arafura and Coral Seas.

Living Seaward: Maritime Cosmology and the Contemporary Significance of Natar Fampompar, a Stone Boat Ceremonial Structure in the Village of Sangliat Dol, Tanimbar Islands

ABSTRACT Natar Fampompar is a stone boat ceremonial structure (natar) in the village of Sangliat Dol on Yamdena Island, Tanimbar Islands, Island Southeast Asia. Located in the village center, it is the only Tanimbarese natar that continues to be used for clan meetings and ceremonial events. As such, it arguably represents the most significant cultural site for understanding Tanimbarese tradition. This article documents the Natar Fampompar and six associated cultural heritage sites. We discuss their historical origins and relevance to the people of Sangliat Dol; how maritime cosmology and maritime identity are evident in social organization, settlement organization, ceremonies, and people’s daily lives; and the function of natar before and after the introduction of Christianity. Initial archaeological work is reported. Finally, this research raises the issue of heritage theft and sale, particularly the carved prow stones of the Natar Fampompar, and how the people of Sangliat Dol hope for their return.

The Camphor Tree and the Elephant: Religion and Ecological Change in Maritime Southeast Asia. By Faizah Zakaria

The Camphor Tree and the Elephant: Religion and Ecological Change in Maritime Southeast Asia. By Faizah Zakaria

THE BOATBUILDING PRACTICES AMONG BOATBUILDERS (TUKANG TIMBAL) IN TERENGGANU, MALAYSIA: A CASE STUDY IN WATER TRANSPORTATION, MARITIME HERITAGE AND CRAFTSMANSHIP IN ASEAN

This case study explores the boatbuilding practices among boatbuilders (Tukang Timbal) in Terengganu, Malaysia, and their significance in preserving maritime heritage and craftsmanshipin ASEAN. By examining the techniques, materials, and cultural influences involved incontemporary boat construction, the research aims to document and analyse the unique practices of these skilled artisans. Employing a qualitative researchapproach, the study combines interviews, observation, and analysis of boatbuilding processes to uncover the knowledge andskills passed down through generations of boatbuilders in Terengganu. It investigates the factors that shape their practices, including local ecological conditions, cultural traditions, and modernadvancements in technology. The research emphasises the role of boatbuilders as culturalcustodians, highlighting the importance of their craftsmanship in preserving Southeast Asianmaritime heritage. By documenting their practices and understanding their cultural significance,the study contributes to the recognition and appreciation of this unique cultural tradition. The findings of this study provide valuable insights into contemporary boatbuilding practices inTerengganu, Malaysia. Examining the techniques and materials employed by boatbuilders,the research deepens our understanding of both the cultural and technological aspects of boat construction in ASEAN today. Ultimately, this case study sheds light on the boatbuilding practices among boatbuilders in Terengganu, Malaysia, contributing to the broader discourse on maritime heritage and craftsmanship in ASEAN. By documenting their unique techniques andmaterials, the study underscores the importance of preserving and promoting these traditionalskills in order to sustain cultural heritage in a rapidly changing world.

Unraveling Dengue Virus Diversity in Asia: An Epidemiological Study through Genetic Sequences and Phylogenetic Analysis.

Dengue virus (DENV) is the causative agent of dengue. Although most infected individuals are asymptomatic or present with only mild symptoms, severe manifestations could potentially devastate human populations in tropical and subtropical regions. In hyperendemic regions such as South Asia and Southeast Asia (SEA), all four DENV serotypes (DENV-1, DENV-2, DENV-3, and DENV-4) have been prevalent for several decades. Each DENV serotype is further divided into multiple genotypes, reflecting the extensive diversity of DENV. Historically, specific DENV genotypes were associated with particular geographical distributions within endemic regions. However, this epidemiological pattern has changed due to urbanization, globalization, and climate change. This review comprehensively traces the historical and recent genetic epidemiology of DENV in Asia from the first time DENV was identified in the 1950s to the present. We analyzed envelope sequences from a database covering 16 endemic countries across three distinct geographic regions in Asia. These countries included Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan, and Sri Lanka from South Asia; Cambodia, Laos, Myanmar, Thailand, and Vietnam from Mainland SEA; and Indonesia, the Philippines, Malaysia, and Singapore from Maritime SEA. Additionally, we describe the phylogenetic relationships among DENV genotypes within each serotype, along with their geographic distribution, to enhance the understanding of DENV dynamics.

Notes on South-East Asian Diospyros L. (Ebenaceae, Ericales): commonly misidentified species in mainland South-East Asia

Diospyros L. is a large genus of flowering plants predominantly distributed in the tropics. It comprises over 700 species globally and around 300 are believed to occur in South-East Asia. Many species are economically important and exploited for the production of ebony wood and persimmons, yet taxonomic information on the genus is incomplete and inconsistent due to its morphological and nomenclatural complexity. Revisions of Diospyros in continental and insular South-East Asia were conducted independently by different authors, occasionally with different names used for the same species, or different species being given the same name in different countries. During our ongoing study of the genus Diospyros in Indochina (Cambodia, Laos, Thailand and Vietnam), we identified several such instances. Here, we clarify the most commonly misidentified species, including 1) D. apiculata Hiern, D. strigosa Hemsl. and D. tamiriensis Lecomte; 2) D. bejaudii Lecomte and D. retrofracta Bakh.; 3) D. dictyoneura Hiern and D. hasseltii Zoll.; 4) D. borneensis Hiern and D. fecunda H.R.Fletcher. Lectotypifications are also made for D. brachiata King & Gamble var. lanceolata H.R.Fletcher, D. fecunda, D. similis Craib and D. strigosa.

Investigating the Interaction Between Transboundary Haze and Planetary Boundary Layer in Singapore

AbstractTransboundary air pollution is one of the critical environmental problems in Southeast Asia; nevertheless the interaction between transboundary haze and local planetary boundary layer (PBL) remains unclear due to a lack of sufficient observations and sophisticated simulations. This study applied LiDAR observations and model simulations to comprehensively evaluate the interaction between transboundary haze and local PBL during a recent transboundary haze episode in Singapore in October 2023. Results show that upper‐level southeasterly wind, especially the nocturnal low‐level jet, created favorable conditions for aerosol transport when fire hotspot numbers increased in Indonesia. The rapid diurnal increase in PBL height facilitated the entrainment of upper‐level haze into the PBL, interacting with ground‐level aerosols through turbulent mixing. Model simulations further show the significant contributions of fire emissions to the transboundary haze episode in maritime Southeast Asia. The impacts extended toward the southern region of Peninsular Malaysia, driven by the persistent prevailing southeasterly wind.

Region-Specific Genetic Diversity of Black Rats (Rattus rattus Complex) in Southeast and East Asia Shaped by Rapid Population Expansion Events.

Among the six mitochondrial DNA lineages of the black rat (Rattus rattus Complex; RrC), lineages II and IV are widespread in Southeast and East Asia. This study explored their demographic history using 17 new sequences from the Miyako Islands in the Ryukyu archipelago, together with 178 publicly available cytochrome b sequences. We defined six and two haplotype groups showing rapid population expansion signals in Lineages II and IV, respectively. The six haplotype groups of Lineage II were represented by haplotypes from 1) Myanmar/Bangladesh/Northeast India, 2) Laos, 3) Thailand, 4) Indonesia/Philippines, 5) Vietnam/southern China, and 6) the Ryukyu archipelago. These expansion times were estimated using time-dependent evolutionary rates to be 115,300 years ago (ya), 128,500 ya, 9600 ya, 10,600 ya, 7200 ya, and 1400 ya, respectively, although all had large confidence intervals. The two groups of Lineage IV were recovered from the mainland and islands of Southeast Asia with predicted expansion times of 197,000 ya and 5800 ya, respectively. These results suggest that climatic fluctuations during the last 200,000 years of the Quaternary, affected the population dynamics in subtropical areas at different times. Furthermore, the results of the younger rapid expansion events of RrC suggest the possibility of agricultural advancement and dispersal of Neolithic farmers to different areas within the mainland and islands of Southeast Asia during the Holocene. A subset of rats from the Miyako Islands were found to have the same lineage IV haplotypes as those in Southeast Asia, suggesting a recent introduction of these new lineages.

Wildlife conservation through traditional values: alarming numbers of crocodile attacks reported from Timor-Leste

AbstractOn the IUCN Red List the saltwater crocodile Crocodylus porosus is categorized globally as Least Concern, with national populations ranging from fully recovered to extinct. The saltwater crocodile population of the Southeast Asian island nation of Timor-Leste was severely depleted by colonial hunting but has recovered since independence in 2002. During 2007–2014 there was a 23-fold increase in reported crocodile attacks (104 documented attacks), concomitant with a 2% annual increase in the human population. Public tolerance to attacks and the reluctance to harm crocodiles are entwined with reverence of crocodiles as sacred beings by most but not all Timorese people. In 2022, 7–8 years after our previous assessment, we visited five sites on the south coast of Timor-Leste in Lautém, Viqueque, Manufahí and Cova Lima municipalities. High rates of crocodile attacks continue. We obtained 35 records of attacks for 2015–2022 (34% fatal). In the municipalities where crocodile attacks occurred (Lautém, Viqueque, Cova Lima), the sacred status of crocodiles prevented inhabitants from harming them in retribution. In Manufahí, where no attacks were reported, such traditional values never existed and crocodiles were hunted for subsistence and to improve safety. The design of a context-specific crocodile management programme that respects the reverence attributed to crocodiles by most people but reduces the risk of people being attacked by crocodiles is a conservation management challenge for the government of Timor-Leste. The developing tourism industry, which relies on coastal beaches and reefs, is jeopardized by the risk of crocodile attacks.

Charting waters: the private sector’s evolving governance role in Southeast Asian maritime security

ABSTRACT Southeast Asian states are frequently viewed as jealously guarding their sovereignty and unwilling to delegate authority to multilateral organisations or private actors. In the contemporary response to regional piracy and armed robbery at sea (PAR), however, insurers and shippers have come to occupy a central governance role while the fortunes of private security actors (PSAs) have declined. Why? This paper conducts a qualitative case study analysis examining the evolving role of shipping and insurance companies and PSAs in the development and implementation of anti-PAR policies in Southeast Asia today. It argues that while the role of PSAs has diminished due to growing regional governance capacities, regional countries and multilateral regulatory frameworks have enlisted insurers and shippers as governance stakeholders, elevating them from beneficiaries of good order at sea to active shapers of this maritime order. The diverging experiences of PSAs and insurers/shippers demonstrate that the regulatory power relationship between states and private actors is not necessarily zero-sum as the role of insurers and shippers has grown even as state capacities have expanded. Ultimately, the paper illustrates the need to go beyond state- and PSA-centric analyses of maritime governance mechanisms in contemporary Southeast Asia.

For granular geographies: Conceptual spaces of anatropism and land reclamation in Singapore

The call for granular geographies represents an interesting intervention in the nexus between old and new materialisms in human geography. While there is a need to look beyond reclamation as volumetric expansion of territory, this commentary discusses how we can think about locating granular geographies in the complex nexus between the conceptual spaces of the ‘tropics’ and ‘temperate.’ This is in addition to theorizing how a singular grain of sand is capable of militarizing and gendering the Southeast Asian island state.

The trope of the Native American in nineteenth-century British and American accounts of South East Asia

ABSTRACT The nineteenth century witnessed the expansion of Western colonial power and influence across both mainland and maritime South East Asia, along with the publication of a growing number of books about the region and its peoples by Western scholars, travellers and colonial administrators. This was also a time when pseudo-scientific theories of racial difference were rife and deemed respectable in Western academic and political circles. This article looks at how some British and American authors were inclined to examine South East Asians through the lens of racial theory, and how in the course of doing so were also inclined to compare some South East Asian ethnic groups to the natives of America. In the course of doing so, Native Americans were invariably seen and cast as a homogenous racial group that was then located at the bottom of a hierarchy that differentiated between superior and inferior races. The repeated deployment of the trope of the Native American, as the embodiment of inferiority and savagery, was an instance of racial stereotypes being instrumentalized at a global level as part of a new pan-Atlantic Anglo-American discourse of race and racial difference.

Phylogenetic Relationship of Diadema: Emphasis on The Two Distinct Clades of D. Setosum With The Inclusion of Long Spine Black Sea Urchin From Malaysian Borneo

Diadema urchins (family Diadematidae) are ecologically important bioindicators of coral reef ecosystems and seagrass beds. Diadema urchins which are widely distributed and broadcast spawners, have been frequently utilized as model invertebrate species for zoogeography research of the Indo-West Pacific region. So far, Malaysian Borneo, located at the geographic center of Maritime Southeast Asia, has been under-sampled. This study aims to fill this sampling gap and provide the first record of Diadema setosum from Malaysian Borneo using genetic diagnostics to conclusively establish the clade-level identity of the species. According to Cytochrome Oxidase I gene analysis, Diadema is monophyletic. Seven species of Diadema namely Diadema palmeri, Diadema clarki, Diadema mexicanum, Diadema antillarum, Diadema paucispinum, Diadema africanum, and Diadema savignyi, formed their subclades with strong bootstrap values, demonstrating interspecific variation. The findings of this study provide further evidence for the presence of two distinct monophyletic clades, with all D. setosum individuals forming a monophyletic clade that later split into two distinct subclades, dividing Red Sea population (D. setosum-b) and Indo-West Pacific populations (D. setosum-a), supported by a significant genetic divergence value ranging from 6.3% to 9.1%. This study also revealed notable levels of nucleotide and population subdivision between the D. setosum from the Indo-West Pacific and the Red Sea populations (Nst = 0.891; Fst = 0.886) with a low number of migrants per generation (Nm = 0.065). This may suggest geographic isolation due to ecological factors preventing each other from surviving in the territory of the other, or that the two clades of D. setosum were a separate species. Additional morphological and molecular analysis is required in the future to ascertain the level of divergence and further resolve the taxonomic confusion within the genus Diadema.