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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology REINWARDTIA ASEAN Journal for Science and Engineering in Materials

Rahayu Sukmaria Sukri, Rahayu Sukmaria

Environmental and Life Sciences Programme, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, BE 1410, Brunei Darussalam

Author-ID : 558103

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Education Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Veterinary

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Articles

NEPENTHES DIVERSITY AND ABUNDANCE IN FIVE HABITATS IN BRUNEI DARUSSALAM Latiff, Nurul Amal; Sukri, Rahayu Sukmaria; Metali, Faizah
REINWARDTIA Vol 14, No 1 (2014): Vol. 14 No. 1
Publisher : Research Center for Biology

LATIFF, N. A., SUKRI, R. S., & METALI, F. Nepenthes diversity and abundance in five habitats in Brunei Darussalam. Reinwardtia 14(1):Â 67 â 71. -- The genus Nepenthes is known to be diverse in Bornean forests and has been recorded in Brunei Darussalam in various forest types. We aim to investigate variation in Nepenthes species richness and abundance at five forest types throughout Brunei Darussalam: open secondary, heath, peat swamp, white sand and mixed dipterocarp forests. A total of thirty-nine 5 x 5 m2 plots were set up in these forest types. Within each plot, Nepenthes species abundance was quantified, with Nepenthes voucher specimens collected and identified to determine species richness. No significant differences were detected either for Nepenthes species richness or abundance between the five forest types, despite records of Nepenthes in Brunei showing preferences for particular habitat types. We suggest that average species richness and abundance remained constant regardless of forest types in this study, but that these results would likely change if sampling intensity is increased in future studies.Â

THE DIVERSITY AND ABUNDANCE OF GROUND HERBS IN LOWLAND MIXED DIPTEROCARP FOREST AND HEATH FOREST IN BRUNEI DARUSSALAM Zaini, Nurul Hazlina; Sukri, Rahayu Sukmaria
REINWARDTIA Vol 14, No 1 (2014): Vol. 14 No. 1
Publisher : Research Center for Biology

ZAINI, N. H. & SUKRI, R. S. 2014. The diversity and abundance of ground herbs in lowland mixed dipterocarp forest and heath forest in Brunei Darussalam. Reinwardtia 14(1): 73 â 78. ?Herbaceous plants are important components of total plant species richness in tropical forests. Ground herb diversity and abundance were studied in a lowland Mixed Dipterocarp forest (Andulau) and a heath forest (Bukit Sawat) in Brunei Darussalam, Borneo. At each site, all ground herbs in twenty randomly selected 10 x 10 m subplots within a one hectare permanent plot were censused and identified. The study recorded a total of 20 families and 32 genera of ground herbs, with the family Zingiberaceae as the most abundant at both sites. Thirteen genera were recorded only at Andulau and 7 genera were exclusive to Bukit Sawat, with twelve genera common to both sites. Ground herb species richness appear higher at Andulau than Bukit Sawat (37 vs. 29), but this difference was not statistically significant at the subplot level. However, ground herb abundance and density were significantly higher at Bukit Sawat than Andulau (n =Â 846 vs. 385; 4230 vs. 1925 individuals ha-1). The more open canopy at Bukit Sawat may provide higher light availability here than at Andulau, which is characterised by a closed canopy. We suggest that light availability is the most important environmental factor influencing ground herb density and abundance at these sites.

TROPICAL PALMS AND FACTORS INFLUENCING THEIR DISTRIBUTIONS AND DIVERSITY, WITH A FOCUS ON Pinanga DIVERSITY IN SOUTHEAST ASIA Abdullah, Mohamad Farid; Md Jaafar, Salwana; Ahmad, Norhayati; Sukri, Rahayu Sukmaria
BIOTROPIA Vol. 31 No. 2 (2024): BIOTROPIA Vol. 31 No. 2 August 2024
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2024.31.2.2023

ARTICLE HIGLIGHTS- The palm genus Pinanga is the most diverse in Southeast Asia. - Limited ecological studies on Pinanga show the influence of environmental factors.- High Pinanga endemism in Borneo requires conservation action.ABSTRACTPalms represent some of the keystone species in tropical forests, providing numerous ecosystem services. They are widely studied by botanists because of their iconic and majestic appearance, although ecological studies of palm abundance, distributions, and diversity have only recently begun to gain attention. The abundance and diversity of palms at different spatial scales can be influenced by various factors, such as climate, soil properties, hydrology, topography and forest structure; understanding these influences is essential for conservation. This review details four abiotic factors (climate, soil chemistry, hydrology and topography) and one biotic factor (forest structure) affecting palm distribution and diversity. The genus Pinanga, one of the most diverse genera of palms, is discussed in terms of its distribution and diversity in Southeast Asia. Ecological studies on Pinanga diversity in the region are examined, revealing the influence of micro- and macro-scale variation in environmental factors, such as litter depth and thickness, canopy openness and crown cover, elevation, slope, aspect, light intensity, humidity and air temperature. The existing knowledge gaps on Pinanga ecology in Southeast Asia are discussed, and the need for more studies on population structures, functional traits and determinants of Pinanga diversity and distributions within different lowland forest types in the region are highlighted. The high endemism shown by Pinanga necessitates a more comprehensive ecological understanding of this genus to better inform its conservation and protection.

Hydrological Drainage Effects on Microbial Dynamics in Badas Peatland: Fungal Decline, Bacterial Dominance, and Reduced Microbial Biomass Carbon Sahat, Muhammad Hadi; Sukri, Rahayu Sukmaria; Jaafar, Salwana; Shivanand, Pooja; Gödeke, Stefan
ASEAN Journal for Science and Engineering in Materials Vol 5, No 2 (2026): (ONLINE FIRST) AJSEM: Volume 5, Issue 2, September 2026
Publisher : Bumi Publikasi Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar

Peatlands are globally important ecosystems for carbon storage and climate regulation, yet hydrological drainage for agriculture and infrastructure has disrupted their ecological balance. This study examined the effects of drainage on soil microbial communities and microbial biomass carbon (MBC) in Badas Peatland, Brunei Darussalam. Soil samples were collected along two transects (Jalan Badas Middle and North) and analyzed using microBIOMETER® and plate count methods. Results revealed that fungal abundance and MBC increased with distance from the drainage canal, whereas bacterial and actinomycete counts decreased. The fungal-to-bacterial ratio showed a strong positive correlation with MBC, indicating that drainage adversely affects fungal populations and soil carbon retention. These findings highlight that fungi are more sensitive to drainage-induced stress than bacteria, reducing the peatland’s capacity for carbon sequestration. The study emphasizes the need for sustainable water management strategies to preserve soil microbiology and mitigate carbon loss from tropical peatlands.

SOIL SEED BANK OF AN EXOTIC Acacia sp. PLANTATION AND AN ADJACENT TROPICAL HEATH FOREST IN BRUNEI DARUSSALAM Suhaili, Adrian Lee Rahman; Tennakoon, Kushan; Sukri, Rahayu Sukmaria
BIOTROPIA Vol. 22 No. 2 (2015): BIOTROPIA Vol. 22 No. 2 December 2015
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2015.22.2.487

Acacias are among the most successful invasive plants in tropical regions, causing significant negative impacts on biodiversity and ecosystem services of invaded habitats. Their invasiveness is partly attributed to their ability to accumulate large soil seed banks in areas they colonize. This study compared seedling emergence and soil seed bank composition under an Acacia mangium plantation and an adjacent tropical heath (kerangas) forest in the Andulau Forest Reserve, Brunei Darussalam. Soil samples were collected from ten 20 × 20 m plots established in three contrasting habitats: the plantation, the adjacent heath forest, and the transition zone between them. Soil samples were subjected to smoke and heat treatments, and seedling emergence was monitored daily over a 12-week period. In a parallel assessment, variations in species richness, seed density, and seed viability were examined across the ten plots. Seedling emergence was highest in the plantation and lowest in the heath forest plots. However, no significant differences among treatments and no significant treatment–habitat interactions were detected. Species richness, seed density, and seed viability in the plantation plots were significantly lower than those in the transition zone and intact heath forest plots. Acacia mangium seeds were not detected in the heath forest soil seed banks but were found in plantation and transition zone plots. The lower native plant species richness, seed density, and viability in the plantation may indicate a higher regeneration potential for the heath forest habitat should major disturbance occur within the reserve. Proper plantation management and continuous monitoring of soil seed banks are recommended to minimize the spread of invasive Acacia species into tropical heath forests of Borneo.

ASSESSMENT OF SEEDLING ABUNDANCE, SURVIVAL AND GROWTH OF TWO DIPTEROCARP SPECIES IN PEAT SWAMP FORESTS OF BRUNEI DARUSSALAM Mohd Din, Hazimah Haji; Bakiri, Nor Basirah; Sukri, Rahayu Sukmaria; Metali, Faizah Haji
BIOTROPIA Vol. 25 No. 2 (2018): BIOTROPIA Vol. 25 No. 2 August 2018
Publisher : SEAMEO BIOTROP

Dryobalanops rappa Becc. and Shorea albida Sym. are Bornean endemics of high conservation value and increasingly threatened by anthropogenic disturbances. In-situ study of seedling abundance and growth performance of these Dipterocarp species was conducted in two selected peat swamp forests of Brunei Darussalam, following a mast fruiting event in March–May 2014. Within six 6 × 6 m plots at each forest site, D. rappa seedlings at the Anduki peat swamp forest and S. albida seedlings at the Badas peat swamp forest were measured for abundance at the initial census in September 2014, as well as survival and relative growth rates (RGR) after a period of 5 months, with the final census in February 2015. We found significantly higher seedling abundance for D. rappa (1885 ± 208) than S. albida (160 ± 71). Significantly higher percentage survival was recorded for D. rappa seedlings (90.8 ± 2.2%) in comparison to S. albida seedlings (81.7 ± 2.2%). S. albida seedlings (0.24 ± 0.02 mm mm⁻¹ month⁻¹) showed significantly greater RGR in stem diameter than D. rappa seedlings (0.18 ± 0.02 mm mm⁻¹ month⁻¹), however, there were no significant differences in the RGRs based on seedling height, leaf number and biomass between D. rappa and S. albida seedlings. In terms of seedling abundance and percentage survival, D. rappa seedlings appeared to be more successful in regeneration and may potentially be used for rehabilitation of degraded tropical peat swamps and other forest types. Our results suggested that greater conservation efforts of peat swamps must be made to protect the Bornean endemic plant species, in particular S. albida.

Co-Authors Abdullah, Mohamad Farid Adrian Lee Rahman Suhaili, Adrian Lee Rahman Ahmad, Norhayati Bakiri, Nor Basirah Faizah Metali, Faizah Gödeke, Stefan Jaafar, Salwana Kushan Tennakoon, Kushan Md Jaafar, Salwana Metali, Faizah Haji Mohd Din, Hazimah Haji Nurul Amal Latiff, Nurul Amal Nurul Hazlina Zaini, Nurul Hazlina Sahat, Muhammad Hadi Shivanand, Pooja

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