Borneo Research Articles

Dynamics of Sweden Agriculture and Extension of the Indigenous People Communities in Borneo Kalimantan, Indonesia

Kenyah Dayak is one of 18 Dayak groups of East Kalimantan Indonesia and has the biggest population among them. Since the 1950s, most Kenyah migrated from their native land, Apau Kayan to downstream in different areas into which the monetary economy had infiltrated to different degrees. Infiltration of the monetary economy leads to changes in the importance and practices of Swidden agriculture, so called ladang in Indonesia. The objectives of this study are to assess the dynamics of ladang practices and the agricultural extension among the indigenous Dayak people. Results show the changes in ladang practices including traditional knowledge and the farming calendar, labor allocation for mutual aid systems and reciprocal work, land productivity, livelihood diversity and income sources, and the gender perspective of ladang. Despite influence by the monetary economy, the Kenyah maintain cohesiveness among themselves through traditional forms of ladang work organization. The extent of such cohesiveness has somewhat declined in the new settlement in sub-urban area. Kenyah people in general are quite responsive to changes in livelihoods diversification, but rather late in adopting agricultural technology or extension due to limitation of Agricultural Agents, cultural constraints and old values.

Correlation of Climate Variability and Burned Area in Borneo using Clustering Methods

The island of Borneo has faced seasonal forest fires for decades. This phenomenon is worsening during dry seasons, especially when droughts are concurrent with the El Niño-Southern Oscillation (ENSO) phenomenon. Climate is therefore one of the drivers of the fire phenomenon. This paper studies the relationship between climate variables, namely temperature, precipitation, relative humidity, and wind speed, and the occurrence of forest fire using two clustering methods, K-means and Fuzzy C-means (FCM) clustering methods. Borneo is clustered into four areas based on burned area data obtained from Global Fire Emission Data (GFED). It is also clustered according to the combinations of climate variables. Both methods reach the highest correlation between the climate variable and the burned area clusters in September. The K-means method gives a correlation of -0.54 while the FCM gives -0.55. In August until October, relative humidity provides the dominant correlation affecting burned area, even though an additional precipitation or wind variable slightly increases the correlation in the FCM method. In November, temperature largely contributed to the burned area by a positive correlation of 0.31 in K-means and 0.33 in FCM. The evaluation performance of the methods is conducted by an internal validation called the Silhouette index. Both methods have positive index values ranging from 0.39 to 0.69 and the maximum value is influenced by the wind cluster. This indicates that the clustering methods applied in this paper can identify one or a combination of climate variables into dense and well-separated clusters.

A study of community structure and beta diversity of epiphyllous liverwort assemblages in Sabah, Malaysian Borneo.

We evaluated the species richness and beta diversity of epiphyllous assemblages from three selected localities in Sabah, i.e. Mt. Silam in Sapagaya Forest Reserve, and Ulu Senagang and Mt. Alab in Crocker Range Park. A total of 98 species were found and a phytosociological survey was carried out based on the three study areas. A detailed statistical analysis including standard correlation and regression analyses, ordination of species and leaves using centered principal component analysis, and the SDR simplex method to evaluate the beta diversity, was conducted. Beta diversity is very high in the epiphyllous liverwort assemblages in Sabah, with species replacement as the major component of pattern formation and less pronounced richness difference. The community analysis of the epiphyllous communities in Sabah makes possible their detailed description and comparison with similar communities of other continents.

Nipponophloeostiba thayeri sp.n., a new species from Sabah, Malaysia(Coleoptera: Staphylinidae: Omaliinae: Omaliini).

Nipponophloeostiba thayeri Shavrin, sp.n. from Borneo Island, Sabah (Malaysia) is described, illustrated and compared with Japanese N. verrucifera Watanabe, 1962.

RETRACTED: Taxonomic study on the montanellus species group of the genus Cyclommatus (Coleoptera: Lucanidae) from Borneo Island, Malaysia, and Indonesia

Abstract Cyclommatus Parry, 1862 is a genus in the family Lucanidae that consists of 62 species. In this study, six species of the montanellus species group in the genus Cyclommatus Parry from mountainous regions in Borneo Island were recognized and reviewed. Taxonomic redescription, one changed status, and key to male species were provided for the first time in this group. As a result, the following six species are reviewed: Cyclommatus montanellus Mollenkamp, 1904; Cyclommatus magnificus Nagel, 1926 stat. rev.; Cyclommatus murutiorum Ikeda and Katsura, 2001; Cyclommatus chewi Mizunuma, 1994; Cyclommatus giraffa Mollenkamp, 1904; and Cyclommatus dooseokyii Kim, 2018, and distributional maps, photographs of adult habitus, and male genitalia are provided.

A hospital-based study on ischaemic stroke characteristics, management, and outcomes in Sarawak: Where do we stand?

BackgroundLocated on the Borneo Island, Sarawak is the largest state of Malaysia and has a population distinctive from Peninsular Malaysia. The ischaemic stroke data in Sarawak had not been reported despite the growing number of patients annually. We aimed to investigate patient characteristics, management, and outcomes of ischaemic stroke in Sarawak and benchmark the results with national and international published data. MethodsWe included ischaemic stroke cases admitted to Sarawak General Hospital between June 2013 and August 2018 from Malaysia National Stroke Registry. We performed descriptive analyses on patient demographics, cardiovascular risk factors, prior medications, smoking status, arrival time, thrombolysis rate, Get With The Guidelines (GWTG)-Stroke measures, and outcomes at discharge. We also numerically compared the results from Sarawak with the published data from selected national and international cohorts. ResultsWe analysed 1435 ischaemic stroke cases. The mean age was 60.1±13.2 years old; 64.9% were male; median baseline National Institute of Health Stroke Scale was seven points. Hypertension was the most prevalent risk factor of ischaemic stroke; 12.7% had recurrent stroke; 13.7% were active smokers. The intravenous thrombolysis rate was 18.8%. We achieved 80–90% in three GWTG-Stroke performance measures and 90–98% in four additional quality measures in our ischaemic stroke management. At discharge, 57% had modified Rankin Scale of 0–2; 6.7% died during hospitalisation. When compared with selected national and international data, patients in Sarawak were the youngest; Sarawak had more male and more first-ever stroke. Thrombolysis rate in Sarawak was higher compared with most studies in the comparison. Functional outcome at discharge in Sarawak was better than national cohort but still lagging behind when compared with the developed countries. In-hospital mortality rate in Sarawak was slightly lower than the national data but higher when compared with other countries. ConclusionOur study described characteristics, management, and outcomes of ischaemic stroke in Sarawak. We achieved high compliance with most of GTWG-Stroke performance and quality indicators. Sarawak had better outcomes than the national results on ischaemic stroke. However, there is still room for improvement when compared with other countries. Actions are needed to reduce the cardiovascular burdens for stroke prevention, enhance healthcare resources for stroke care, and improve intravenous thrombolysis treatment in Sarawak.

The Borneo Islamic Heritage and The Significance of Idahan Jawi Manuscript

Borneo Island is the third largest island in the world, rich in natural resources, biodiversity and cultural diversity. The uniqueness of Borneo is that it is home to three countries; Malaysia, Indonesia and Brunei Darussalam, each with their own valuable cultural heritage. One of the unique aspects of the Borneo archipelago is the shared wealth of civilizations derived from the dissemination of Islam. Treasures known as the “Borneo Islamic Heritage" are not only valuable as cultural artefacts that need to be preserved, but they can also be elevated and commercialised as regional economic drivers. This paper discusses the Idahan manuscript written in Jawi script as one of the treasures of Islamic intellectual legacy in Borneo. The method of study is based on content analysis which depicts the descriptive history of the discovery of the Idahan Jawi manuscript. This manuscript not only serves as evidence of the early embrace of Islam in Sabah, but also as a reference to matters pertaining to religion and the laws of Islamic jurisprudence. This factor leads the Idahan community be considered as the first native people embracing Islam at the east coast of Sabah. The contribution of this study is to enhance understanding of the development of Islamic heritage in Borneo Island and to inculcate the spirit of solidarity among the people living in the region.

Occurrence and ecological implication of a tropical anguillid eel, Anguilla marmorata, in Brunei Darussalam, Borneo Island

Tropical anguillid eels account for two-thirds of the 19 species in Anguilla Schrank, 1798. However, information on the species diversity, geographical distribution, and life histories of the tropical eels is very limited. Recent studies suggested that morphological species identification of the tropical anguillid eels should be validated by molecular analysis for accurate identification. After surveying for three years, two anguillid eels were found in Brunei Darussalam, Borneo Island. They were firstly identified as Anguilla marmorata Quoy & Gaimard, 1824 using morphological analysis and further gene analysis of cytochrome c oxidase subunit I (COI) confirmed the species identification. This study is the first comprehensive description of A. marmorata in Brunei Darussalam, Borneo Island. Furthermore, it is also the first study to validate two anguillid eels collected from the tropical Bonin Islands of Japan as A. marmorata by means of morphological and COI analyses. The molecular phylogenetic tree and haplotype network analyses suggest that A. marmorata found in Brunei Darussalam would belong to the North Pacific population of the westernmost distribution.

Early Detection of Undiagnosed Abdominal Aortic Aneurysm and Sub-Aneurysmal Aortic Dilatations in Patients with High-Risk Coronary Artery Disease: The Value of Targetted Screening Programme.

IntroductionAbdominal aortic aneurysm (AAA) and coronary artery disease (CAD) share common risk factors. The objective of this study was to determine the prevalence of undiagnosed AAA in patients with angiographically diagnosed significant CAD.Patients and MethodsMale patients aged 50 years and above (including indigenous people) with angiographically diagnosed significant CAD in the recent one year were screened for AAA. Standard definition of abdominal aortic aneurysm and CAD was used. All new patients were followed up for six months for AAA events (ruptured AAA and AAA-related mortality).ResultsA total of 277 male patients were recruited into this study. The total prevalence of undiagnosed AAA in this study population was 1.1% (95% CI 0.2–3.1). In patients with high-risk CAD, the prevalence of undiagnosed AAA was 1.7% (95% CI 0.3–4.8). The detected aneurysms ranged in size from 35.0mm to 63.8mm. Obesity was a common factor in these patients. There were no AAA-related mortality or morbidity during the follow-up. Although the total prevalence of undiagnosed AAA is low in the studied population, the prevalence of sub-aneurysmal aortic dilatation in patients with significant CAD was high at 6.6% (95% CI 3.9–10.2), in which majority were within the younger age group than 65 years old.ConclusionThis was the first study on the prevalence of undiagnosed AAA in a significant CAD population involving indigenous people in the island of Borneo. Targeted screening of patients with high-risk CAD even though they are younger than 65 years old effectively discover potentially harmful asymptomatic AAA and sub-aneurysmal aortic dilatations.

Intraseasonal, Seasonal, and Interannual Characteristics of Regional Monsoon Simulations in CESM2

AbstractA survey of intraseasonal, seasonal, and interannual precipitation and 850 hPa winds for various monsoon regimes around the world is presented for the Community Earth System Model Version 2 (CESM2) compared to observations and the previous generation CESM1. In CESM2 the south Asian monsoon has a reduction of excessive precipitation in the western Indian Ocean and an increase of precipitation in the eastern Bay of Bengal and land areas of Vietnam, Cambodia, and Laos. The seasonal timing of the south Asian monsoon, monsoon‐ENSO connections, and monsoon intraseasonal variability all are improved compared to CESM1. For the Australian monsoon, deficient precipitation over the Maritime Continent has been improved in CESM2 with increases of precipitation over the large tropical islands of Borneo, Celebes, and Papua New Guinea and decreases over southwestern Australia. In the West African monsoon, May–June seasonal rainfall occurs more preferentially over the African coast in CESM2 as in observations, and excessive rainfall over the Ethiopian region is reduced. During July–September in the West African monsoon, deficient precipitation over equatorial Africa in CESM1 has been lessened in CESM2, and there are increases in precipitation over the Guinean coast, though there is little overall improvement in the South African monsoon. In the South American monsoon, precipitation in CESM2 is improved with increased precipitation over the Amazon in central and western Brazil. CESM2 simulates a reduction of excessive precipitation seen in CESM1 over coastal Mexico extending up into the U.S. Great Plains in the North American monsoon.

Migration of black-naped terns in contrasted cyclonic conditions

Cyclones are currently increasing in frequency and intensity across the tropical regions, and such changes in cyclonic activity can adversely impact tropical marine ecosystems. To examine the potential effects of these changes on marine migrations, we tracked the annual at-sea distribution of black-naped terns from Okinawa Islands, southwest Japan (26.5° N; 127.9° E). Using light-based geolocation loggers, we compared the migration chronology of six terns between 4 years of contrasted conditions regarding cyclones (regionally called typhoons). Shortly after breeding (30 August ± 13.9 days), the birds undertook their migration across the Philippine Sea to coastal regions of Borneo and Sulawesi Islands, and seemed able to avoid or cross the storm systems. The two birds tracked in years of medium–high typhoon activity (2012–2014) seemed to target a stopover area in the northern Philippines several days after a typhoon hit. By contrast, in 2017, no strong typhoon hit in August and the four study birds showed later departure by 23.8 days, but moved significantly quicker, with little or no stopover. Arrival date at the wintering site was similar among years (1 October ± 3.5 days). Terns thus show remarkable variability in their migration chronology, presumably linked with annual storm frequency. However, the limits to this variability are currently unknown. Further, if individuals respond to environmental cues to time their migration to potentially benefit from lagged optimal feeding conditions en route, it is likely that the increase of back-to-back cyclonic events in the region may reduce the benefits of such a strategy for surface-feeding predators.

Multi-variable model output statistics downscaling for the projection of spatio-temporal changes in rainfall of Borneo Island

A multiple variable bias correction approach has been proposed for the projection of the changes in spatial and temporal pattern of rainfall in Borneo Island due to climate change. The ensemble of General Circulation Models (GCMs) was selected through the combination of past performance and envelope approaches. The selected GCMs were downscaled using a Support Vector Machine (SVM) based multiple variable bias correction approach considering that inclusion of multiple circulation variables can provide more information on local climate and able to explicitly account for GCM-inherent error and bias. Finally, an ensemble projection was produced by using Random Forest (RF) regression to simulate the future projection. Four GCMs namely, HadGEM2-AO, HadGEM2-ES, MIROC5 and CCSM4 were found most suitable for the projection of rainfall in Borneo with associated uncertainty. The projected changes in rainfall indicate that the rainfall pattern and variation in Borneo are dominated based on the changes of monsoon season, geographical locations and terrains of the region. Overall, there is an increasing rate of rainfall projections in most parts of Borneo. However, the coastal-western region will become drier in contrast to the eastern region, although rainfall variability remains high. The highest increase in rainfall was projected in East Kalimantan in the range of 11.9% to 50.1% for 2070–2099, while the highest decrease was projected in West Kalimantan in the range of −3.7% to −13.0% for 2010–2039. The rainfall was expected to be more distributed during the Southwest monsoon while shorter Northeast monsoon with higher intensity was projected at most regions.

The Utilization of Tourism Education Packages in Amanah Borneo Park as a Learning Resources on Social Studies

Destinasi Wisata, sebagai tempat untuk rekreasi, dapat dijadikan sebagai wahana edukasi. Destinasi wisata Amanah Borneo Park di Kota Banjarbaru menjadikan destinasi wisata tersebut sebagai wahana edukasi dengan paket edukasi. Paket wisata edukasi tersebut dapat dimanfaatkan sebagai sumber belajar Pendidikan IPS. Penelitian ini bertujuan untuk mendeskripsikan aktivitas paket wisata edukasi Amanah Borneo Park sebagai sumber pembelajaran IPS menggunakan pendekatan kualitatif dengan metode kualitatif. Pengumpulan data melalui observasi, wawancara, dan dokumentasi. Analisis data melalui reduksi data, penyajian data, dan verifikasi. Keabsahan data melalui triangulasi (sumber, teknik, dan waktu), perpanjangan pengamatan, menggunakan bahan referensi, dan member cek. Simpulan penelitian adalah aktivitas paket wisata edukasi Amanah Borneo Park dapat dimanfaatkan sebagai sumber belajar IPS yang bersifat kontekstual dan memudahkan peserta didik dalam memahami materi pelajaran sehingga mereka antusias mengikuti pembelajaran.

Prevalence and risk factors of prehypertension in university students in Sabah, Borneo Island of East Malaysia.

Unhealthy lifestyle contributes mainly to an increased prevalence of non-communicable diseases including hypertension and cardiovascular diseases tend to increase in Malaysia. These diseases lead to an increased risk of end organ damage and cardiovascular complications. In this study, the prevalence of prehypertension and its associated risk factors among a cohort of university students in Sabah was determined.This is a prospective, cross-sectional study conducted among 365 undergraduate students irrespective of faculties at Universiti Malaysia Sabah (UMS). Standardized and validated World Health Organization (WHO) STEPS questionnaires were used to collect sociodemographic data. Additionally, clinical and anthropometric data were measured and recorded by a trained staff, followed by descriptive and logistic regression analyses.A total of 365 UMS undergraduate students aged 18 years and above participated in the study. The prevalence of prehypertension among university students was high (31%) (95% CI [29.1%, 34.3%]). Well-known risk factors for hypertension including family history of hypertension, reduced sleep duration, reduced physical activity, smoking, being overweight or obese were significantly associated with the risk of developing prehypertension (P < .05) among UMS students. However, no association was observed between ethnicity, age, and gender with prehypertension.A worryingly high percentage of UMS students are prehypertensive, indicating the need of early preventive strategies aimed at increasing awareness, early screening, and lifestyle modification to reduce the rising burden of the disease and the associated complications in this age group.

From mainland to islands: colonization history in the tree frog Kurixalus (Anura: Rhacophoridae).

The origin and colonization history of Kurixalus, a genus of small arboreal tree frogs breeding exclusively in shallow swamps, is under disputed. On the basis of comprehensive sampling program, the evolutionary history of Kurixalus is investigated based on 3 mitochondrial genes. Our results indicate that the genus Kurixalus originated in the Asian mainland and subsequently arrived at its current distribution in Borneo, Taiwan, Ryukyu, and Hainan islands by a series of dispersal events. Moreover, the colonization of Taiwan from mainland Asia has occurred 2 times. The initial colonization of Taiwan occurred at 3.46–8.68 Mya (95% highest posterior density), which rejects the hypothesis that Kurixalus probably originated from Taiwan during the early Oligocene and favors the model of Neogene-origin rather than the model of Quaternary-origin for Taiwanese Kurixalus. Kurixalus eiffingeri has dispersed from Taiwan to the Ryukyus once or 2 times pending more data. Both transoceanic dispersal and landbridge dispersal have played a role in the colonization process; the former resulted in the colonization of Taiwan and the Ryukyus and the latter led to the colonization of Borneo and Hainan.

Impacts of Four Decades of Forest Loss on Vertebrate Functional Habitat on Borneo

Tropical forests are undergoing drastic transformations, putting at risk the species that rely on them. On the island of Borneo, between 1973 and 2015, 50% of the forest has been lost, much of this to oil palm and other industries. We explore the impacts of these four decades of forest loss on the functionally connected habitat of 245 forest birds and mammals. First, we map potential suitable habitat in 1973 and 2015 by refining reported ranges by elevation, forest cover and patch size. We find that, on average, these species have lost 28% of habitat within their ranges. Then we use graph-theory connectivity models to calculate the amount of area that is functionally connected for each species, according to their natal dispersal abilities. This analysis shows a mean loss of 35% of their connected habitat and reveals the larger, and often hidden, impacts from deforestation. Losses in functionally connected habitat are largely driven by area of habitat loss, yet maximum elevational range limit also explain some of the differences modelled across species with lowland species being the most affected. We present a vulnerability index of threat arising from functionally connected habitat loss. The spatial aggregation of this vulnerability index serves as a tool for setting conservation priorities for forest remnants on Borneo, given that most of the ranges of these species are not protected. We make recommendations for the use of connectivity models to prioritize resources for research and conservation on Borneo and other biodiversity hotspots.

Effect of Application ISO 38200:2018 Chain of Wood Products Custody toward Paper Company Competitiveness in Borneo Island Indonesia

The purpose of this research is to determine the effect of the implementation of the ISO 38200: 2018 management system on the competitiveness of companies for the paper industry. This research was carried out in several companies that use wood as raw material for production in Kalimantan Indonesia with a total of 263 company respondents who have implemented a management system ISO 38200: 2018. The research background is due to lack of research on the benefits of ISO 38200:2018 in wood companies in Borneo Indonesia. The data collection was carried out by distributing questionnaires on september until october 2019 and analyzing data processing use Structural Equation Model (SEM) and software Linear Structural Model (LISREL) version 8.70. The results show that the implementation of ISO 38200:2018 has significantly influenced business competitiveness such as increase customer satisfaction index, increase sales, increase productivity and safety and employee satisfaction.

Biodiversity of Bucephalandra Motleyana Schott (Schott, 1858) based on commercial name in Jabodetabek: Ornamental Aquatic Biota Market.

Bucephalandra sp. is a genus of aquatic plants endemic to Borneo Island, representing the Araceae family. Bucephalandra sp. is famous for its ornamental aquatic plants which are usually used in aquascaping. These aquatic plants come at fantastic prices, e.g. ±300 euros in European ornamental aquatic markets and Rp 50,000 – 700,000 in Indonesian aquatic plant markets. We collected 195 types of Bucephalandra from an ornamental aquatic plant market in Jakarta. In the market, they are sold under its commercial name. Therefore, the aim of this study is to collect and identify the species of all Bucephalandra types in the aquatic plant commercial market. These species that we identified are based on botanical taxonomist identification in the Herbarium Bogoriense Department Botany – Research Centre for Biology – Indonesian Institute of Science (LIPI) Cibinong. The result of this study is from our collection (195 types) of which 102 types are Bucephalandra Motleyana Schott species and 90 types are the other species of Bucephalandra.

Numerical Simulation of Water Renewal Timescales in the Mahakam Delta, Indonesia

Water renewal timescales, namely age, residence time, and exposure time, which are defined in accordance with the Constituent-oriented Age and Residence time Theory (CART), are computed by means of the unstructured-mesh, finite element model Second-generation Louvain-la-Neuve Ice-ocean Model (SLIM) in the Mahakam Delta (Borneo Island, Indonesia). Two renewing water types, i.e., water from the upstream boundary of the delta and water from both the upstream and the downstream boundaries, are considered, and their age is calculated as the time elapsed since entering the delta. The residence time of the water originally in the domain (i.e., the time needed to hit an open boundary for the first time) and the exposure time (i.e., the total time spent in the domain of interest) are then computed. Simulations are performed for both low and high flow conditions, revealing that (i) age, residence time, and exposure time are clearly related to the river volumetric flow rate, and (ii) those timescales are of the order of one spring-neap tidal cycle. In the main deltaic channels, the variation of the diagnostic timescales caused by the tide is about 35% of their averaged value. The age of renewing water from the upstream boundary of the delta monotonically increases from the river mouth to the delta front, while the age of renewing water from both the upstream and the downstream boundaries monotonically increases from the river mouth and the delta front to the middle delta. Variations of the residence and the exposure times coincide with the changes of the flow velocity, and these timescales are more sensitive to the change of flow dynamics than the age. The return coefficient, which measures the propensity of water to re-enter the domain of interest after leaving it for the first time, is of about 0.3 in the middle region of the delta.

THREATS AND CONSERVATION EFFORTS OF THE LAST REMAINING BANTENG (Bos javanicus lowi) IN UNPROTECTED AREAS AT BELANTIKAN HULU, CENTRAL KALIMANTAN

Bornean banteng is classified as endangered and found only in Borneo island. The existence of a wild population of Bornean Banteng in Belantikan Hulu, in the north-western part of Indonesia’s Central Kalimantan Province, has been confirmed from the results of camera-trap programme since 2013, but its population size has yet to be determined. The study aimed to identify the threats to the banteng population in Belantikan Hulu and describe the conservation efforts that have already been taken there. Although Belantikan Hulu is now one of the priority habitats for conserving banteng in Kalimantan, the area lies outside the nationally-designated conservation area network. Hunting is one of the greatest threats that can lead directly to failure in their population. Local informants were able to describe the location and number of 24 banteng that were killed over a 65-year period, from the 1950’s to 2015. The true number is likely to be much higher, since these data were derived from a sample representing only 30% of the local hunting community, and they did not include information from any outsiders. Logging, mining and shifting cultivation in around banteng habitats are important factors that are currently contributing to the destruction and degradation of their habitats in Belantikan Hulu. Conservation efforts have got a lot of supports from local stakeholders. These efforts have led to a customary regulation being adopted that prohibits hunting of banteng or degradation of their habitats around their key saltlicks and feeding sites, and the creation of local conservation area of 1,700 ha (on land voluntarily released by the logging company) that includes these key sites.&#x0D; &#x0D; Keywords: bornean banteng, conservation, habitat, hunting, threat