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Yasman Yasman
Biology Department, Faculty Of Mathematics And Natural Sciences, Universitas Indonesia
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Detailed description of scanning electromagnetic microscope (SEM) of the Holothuria scabra’s ossicles (Holothuroidea: Echinodermata) collected from Pesawaran waters, Lampung, Indonesia TIARA S. KHATULISTIANI; ARIYANTI S. DEWI; YASMAN YASMAN
Biodiversitas Journal of Biological Diversity Vol. 23 No. 7 (2022)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d230747

Abstract

Abstract. Khatulistiani TS, Dewi AS, Yasman. 2022. Detailed description of scanning electromagnetic microscope (SEM) of the Holothuria scabra’s ossicles (Holothuroidea: Echinodermata) collected from Pesawaran waters, Lampung, Indonesia. Biodiversitas 23: 3697-3704. Ossicles are the microscopic calcified endoskeleton that are unique across sea cucumber species. Furthermore, their integrity is maintained after physical and chemical processes that make them a desired attribute for identification purposes.  Understanding ossicle characteristic especially for the sandfish H. scabra juvenilles is important during mariculture and prevent fraud due to their high economic value. This study aims to identify wild H. scabra ossicles from Pesawaran waters, Lampung Province, Indonesia using scanning electron microscopes (SEM) to get more detailed morphology of their ossicles. Seven specimens of H. scabra were collected in Pesawaran, Sari Ringgung and Mutun, around Pesawaran waters. Morphology identification were carried out by observing the body appearance and tentacles of the specimens as well as measuring their weights and lengths. The observation of the ossicles was performed using a light microscope (LEICA ICC50 HD) at 400x magnification and a SEM (Jeol-JCM6000). The length of the tested specimens were around 140-300 mm and their weight were approximately 99-579 g. These two parameters were found to exhibit positive correlation (R2 = 0.93; R= 0.96; p = 0.000). All observed specimens displayed peltate tentacles (12-22 tentacles) surrounding their mouths. The correlation between length and tentacle numbers was also positive (R2= 0.53; R= 0.73; p = 0.101). The shape of the ossicles consist of six to fourteen-hole buttons, tables, spiny perforated plates from the cloaca, tube foot rods, tentacle rods, dorsal rods, dorsal perforated spiny rods, I shaped and branched rods.
Short Communication: Dacini tribe's fruit fly species in Depok (Indonesia) with special reference to the abundance of orchard fly, Bactrocera dorsalis, for fruit pest controlling QORY HERRAHMAWATI; RATNA YUNIATI; YASMAN YASMAN
Biodiversitas Journal of Biological Diversity Vol. 24 No. 4 (2023)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d240460

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Abstract. Herrahmawati Q, Yuniati R, Yasman. 2023. Short Communication: Dacini tribe's fruit fly species in Depok (Indonesia) with special reference to the abundance of orchard fly, Bactrocera dorsalis, for fruit pest controlling. Biodiversitas 24: 2447-2457. Knowledge of diversity and regularly monitoring pest insects in fields is crucial in crop protection and is key to effective pest control management. Our research group aims to map the species diversity of the Dacini tribe's fruit flies in Depok (Indonesia) using lure fruit fly traps and rearing fruit fly larvae from infected fruits. This preliminary study result is important for our next study to control fruit flies using tropical fruit extract as a natural lure. Four fruit flies were obtained from infected fruit purchased from a traditional fruit seller: Bactrocera dorsalis (Hendel 1912) and Bactrocera albistrigata (Meijere 1911) from Syzygium aqueum (Burm.fil.) Alston fruit and Bactrocera fuscitibia (Drew & Hancock 1994) and Bactrocera carambolae (Drew & Hancock 1994) from arum manis (Mangifera indica L.) fruit. Meanwhile, three fruit fly species were caught in lure traps using methyl eugenol: B. dorsalis, Bactrocera umbrosa (Fabricius 1805), and Bactrocera musae (Tryon 1927). Detailed morphological descriptions were provided for each species obtained. The B. dorsalis was the most abundant, while B. musae were the least abundant. This study's total number of individuals was 6,329 for B. dorsalis, 485 for B. umbrosa, and 34 for B. musae. The B. dorsalis is widely distributed in many tropical areas of Asia-Pacific and is considered an invasive species in Africa. Moreover, it is well known as one of the most important pest species within the Tephritidae family. While the remaining obtained fruit fly species have also been reported as pests, it is interesting to note that B. fuscitibia was reported as a non-pest species but was obtained from an infected mango fruit in this preliminary study. The B. musae was also reported for the first time in Depok, West Java Province, Indonesia.
Short Communication: First report on the occurrence of microplastic contamination in mariculture Eucheuma cottonii from Lancang Island, Kepulauan Seribu National Park, Jakarta, Indonesia MBARA CHAM; YASMAN YASMAN
Biodiversitas Journal of Biological Diversity Vol. 25 No. 10 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d251059

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Abstract. Cham M, Yasman Y. 2024. Short Communication: First report on the occurrence of microplastic contamination in mariculture Eucheuma cottonii from Lancang Island, Kepulauan Seribu National Park, Jakarta, Indonesia. Biodiversitas 25: 3995-3999. Microplastics (MPs) contamination in marine environments significantly threatens marine ecosystems and human health. This study presents the first recorded occurrence of MP contamination in the macroalga Eucheuma cottonii Weber Bosse, 1913, specifically in samples collected from Lancang Island, Kepulauan Seribu National Park, Jakarta, Indonesia. Fibrous blue MPs, measuring approximately 400 µm, were identified in two samples, each weighing 15 g (wet weight). This finding aligns with previous studies reporting fibrous MPs as the global contaminants in macroalgal populations. Despite the similarity, our findings contrast with those from nearby regions, where fragment MPs were observed as the most abundant form. The interaction between MPs and macroalgae is influenced by factors such as surface texture, chemical composition, and the presence of mucilage. Additionally, MPs have been shown to impact macroalgal health, reducing growth rates and photosynthetic efficiency and increasing oxidative stress, highlighting the need for further research. Considering E. cottonii as an edible macroalga and a critical habitat provider in marine ecosystems, regular monitoring of MPs contamination is essential. This research contributes to a broader investigation of MP contamination, growth patterns, and secondary metabolite production in macroalgae under different cultivation techniques, underscoring the importance of sustainable practices in marine resource management.
The spillover effect of bird functional groups on oil palm smallholdings in Indonesia DIMAS HARYO PRADANA; MUFTI PETALA PATRIA; YASMAN YASMAN; NURUL LAKSMI WINARNI
Biodiversitas Journal of Biological Diversity Vol. 25 No. 12 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d251243

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Abstract. Pradana DH, Patria MP, Yasman, Winarni NL. 2024. The spillover effect of bird functional groups on oil palm smallholdings in Indonesia. Biodiversitas 25: 5055-5062. In Southeast Asia, oil palm plantations are a major cause of deforestation, a situation that demands urgent attention. On the other hand, oil palm is important for the economy of Southeast Asian countries. Thus, there are attempts to develop sustainable palm oil production. The spillover effect of bird functional groups on oil palm smallholdings was studied in Indonesia from 14 September to 14 October 2022 and from 23 September to 20 October 2023. Whether birds at oil palm smallholdings provide insect pest control was also examined. The point count method was used to count birds at the oil palm smallholding, ecotone, and adjacent forest remnant at four oil palm smallholdings in Riau Province and two in Central Kalimantan. A bird exclosure experiment was used to examine whether birds provide insect pest control. The difference in bird abundance of the three habitat types was analyzed using the Kruskal-Wallis and Wilcoxon test as the post-hoc test. Wilcoxon test was also used to analyze the difference in herbivory rate of bird exclosure and control of oil palm leaflet seedlings. Carnivore birds showed lower abundance at the oil palm smallholdings than at the ecotone, indicating a spillover effect process. However, there was no significant difference between the herbivory rate of control and bird exclosure treatment, suggesting insect pest control service provided by birds dispersed to oil palm smallholdings could be more optimal.
First documentation of mangrove-associated gastropods highlights the status of early mature stands in the mangrove ecosystem of Pramuka Island, Jakarta Bay, Indonesia YASMAN YASMAN; MBARA CHAM
Biodiversitas Journal of Biological Diversity Vol. 26 No. 3 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d260346

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Abstract. Yasman, Cham M. 2025. First documentation of mangrove-associated gastropods highlights the status of early mature stands in the mangrove ecosystem of Pramuka Island, Jakarta Bay, Indonesia. Biodiversitas 26: 1453-1460. This study examined the gastropod community in the Pramuka Island mangrove ecosystem, Jakarta Bay, Indonesia, focusing on species composition, ecological indices, and the influence of abiotic factors across different mangrove zones. A total of five gastropod species associated with mangroves were identified, with Cerithium coralium and Terebralia palustris being the most frequent and abundant. The presence of T. palustris, Telescopium telescopium, Nerita planospira, and C. coralium marks the first recorded occurrence of these species in the Pramuka Island mangrove ecosystem. The ecological indices revealed low diversity (H': 0.57), low evenness (E: 0.35), and high dominance (C: 0.78), thereby indicating an imbalanced gastropod community. These findings suggest that the island’s mangrove ecosystem is in the early stages of maturity in the form of a planted mangrove habitat. Abiotic parameters, including temperature, pH, salinity, and light intensity, were assessed, with light intensity showing significant variation between areas inside and outside the mangrove canopy. While other abiotic factors remained relatively stable, gastropod distribution appeared to be more influenced by feeding preferences and resource availability than by differences in light intensity. These results highlight the importance of understanding the ecological dynamics of mangrove-associated gastropods and their interactions with environmental factors, providing valuable insights for future mangrove restoration and management efforts.
Macroalgal community structure and beta diversity in the coastal waters of East Lombok, Indonesia ABDULLAH RASYID; MASTERIA YUNOVILSA PUTRA; WINDRI HANDAYANI; YASMAN YASMAN
Biodiversitas Journal of Biological Diversity Vol. 26 No. 7 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d260703

Abstract

Abstract. Rasyid A, Putra MY, Handayani W, Yasman. 2025. Macroalgal community structure and beta diversity in the coastal waters of East Lombok, Indonesia. Biodiversitas 26: 3115-3124. Coastal ecosystems in East Lombok, Indonesia, are home to diverse macroalgal communities influenced by local environmental factors. This study investigates macroalgal community structure and beta diversity across three distinct locations: Station 1 (Dasan Ujung Beach), Station 2 (Telong Elong Beach), and Station 3 (Pinky Beach). The survey categorized macroalgae into Chlorophyta, Rhodophyta, and Phaeophyta, and employed Simpson and Sørensen dissimilarity indices alongside the nestedness-resultant component (?sne) to assess community variability. The results show that Station 2, with a complex substrate of coral rubble and calcareous mud, supported a more diverse macroalgal community, including calcifying species like Halimeda spp. In contrast, eutrophic conditions at Station 3 promoted the dominance of Ulva lactuca, a species indicative of nutrient-rich waters. The beta diversity indices reveal that substrate type and nutrient enrichment play critical roles in shaping macroalgal diversity and community composition, rather than water chemistry alone. These findings suggest that habitat heterogeneity and local anthropogenic pressures significantly influence coastal biodiversity. This study contributes new insights into the ecological drivers of macroalgal distribution in East Lombok and offers a framework for future marine conservation and monitoring.
Influence of forest configuration and bird exclusion on insect herbivory in Indonesian oil palm smallholdings DIMAS HARYO PRADANA; NURUL LAKSMI WINARNI; MUFTI PETALA PATRIA; YASMAN YASMAN
Biodiversitas Journal of Biological Diversity Vol. 26 No. 9 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d260934

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Abstract. Pradana DH, Winarni NL, Patria MP, Yasman. 2025. Influence of forest configuration and bird exclusion on insect herbivory in Indonesian oil palm smallholdings. Biodiversitas 26: 4640-4646. The insect pest control services provided by birds may help address one biological challenge in oil palm plantations. Previous studies suggest that understory birds contribute to this ecosystem service and that forest configuration may influence their effectiveness. We investigated whether understory birds reduce insect pests and whether forest configuration affects their pest control services in six oil palm smallholdings in Indonesia. Understory birds were surveyed using the point count method at 0-200 m from adjacent forests. Herbivory rates, used as a proxy for insect pest activity, were assessed through a bird enclosure experiment. The indirect bird effect on herbivory rate was also evaluated using this experiment. We used binomial Generalized Linear Mixed Model (GLMM) to analyze the effects of understory bird abundance and forest configuration on herbivory rates. Results showed the herbivory rate ranged from 0.01 to 0.84 mm². A weak negative relationship between understory bird abundance and herbivory in control treatments (z: -1.65, n: 12, p-value<0.1) was found, suggesting a limited pest control effect. However, no significant influence of forest distance or remnant size on herbivory rates was observed. Functional trait analysis revealed that the bird community was dominated by gleaners, omnivores, and large-bodied species, which are typically associated with insectivores. The absence of strong effects may be linked to small forest remnant sizes, low pest abundance, and the structural limitations of smallholder oil palm understory that limit the use of this habitat by forest understory birds. While understory birds show some potential for insect pest control, their effectiveness appears constrained under current conditions. It is clear that urgent action is needed. Habitat enhancement through reforestation and vegetation management to increase habitat connectivity, and may be necessary to support more robust pest control by bird communities in oil palm landscapes.
Allelopathic activity of Dendrophthoe pentandra as a potential bioherbicide to inhibit seed germination and seedling growth of Eleusine indica Lutfan Alharits; Niarsi Merry Hemelda; Yasman; Windri Handayani
Nusantara Bioscience Vol. 12 No. 1 (2020)
Publisher : Smujo International

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/nusbiosci/n120106

Abstract

Abstract. Alharits L, Hemelda NM, Yasman, Handayani W. 2020. Allelopathic activity of Dendrophthoe pentandra as a potential bioherbicide to inhibit seed germination and seedling growth of Eleusine indica. Nusantara Bioscience 12: 33-39. Dendrophthoe pentandra (L.) Miq. is a common parasitic plant in Southeast Asia. As a parasitic plant, it exhibits phytochemicals important for infecting its host, which may be potential as bioherbicide. This study was aimed to evaluate allelopathic activity of D. pentandra (stem and leaf extracts) to control Eleusine indica (L.) Gaertn. seed germination and growth. Methanolic extracts of D. pentandra stem and leaf (0, 1, 2, 3, 4 and 5 mg/mL in water) were treated on E. indica seeds in a petri dish for 10 days. After 10 days, germination of treated E. indica seeds was significantly reduced and reached >80% inhibition at 5 mg/mL. Moreover, E. indica roots were more sensitive compared to E. indica shoots, indicated by root inhibition >50% at 1 mg/mL and reached >90% inhibition at 5 mg/mL. Leaf extract presented stronger inhibition than stem extract, but not significant. It may be related to the higher accumulation of phenolic and flavonoid compounds in leaf extract than in stem extract. This is the first report of allelopathic activity in D. pentandra to inhibit E. indica germination and growth. Therefore, further study in a greenhouse, as well as metabolism effects of D. pentandra on the target weeds are important to provide comprehensive evaluation of D. pentandra potential as bioherbicide.
Co-Authors A. Sofyan A. Sofyan ABDUL BASITH ABDULLAH RASYID Abinawanto Aini, Fadita Nurul ARIYANTI S. DEWI Arkan Askarillah Hidayat Arum Albuntana Azmi Syafanah Nur Hasna Bayu Arif Pasa Laksmana Cham, Mbara Cynthia Putri Yuwana Dewi Susylowati Dian Hendrayanti DIMAS HARYO PRADANA DIMAS HARYO PRADANA DWI ARIYOGA GAUTAMA Ediviani, Wanda ENI KUSRINI Ewin Nurdin Fachrul Razi Feni Andriani H. Julendra Hedza Fadli Robbina Hernuryadin, Yayan Ikhsan Pratama IMAM MUSTHOFA ZAINUDIN Iman Santoso Jatna Supriatna L. Istiqomah Laksmana, Bayu Arif Pasa Limgiani Limgiani Lutfan Alharits M. F. Karimy M. F. Karimy Maryenti, Tety MASTERIA YUNOVILSA PUTRA MBARA CHAM MBARA CHAM Mufti Petala Patria Muhammad A Rijal Munawarohthus, Sholikha Nendyo Adhi Wibowo Niarsi Merry Hemelda NIKEN DHARMAYANTI Nissa, Maftucha Noverita Dian Takarina NURUL LAKSMI WINARNI NURUL LAKSMI WINARNI Octavia, Silvi PRIYANTO RAHARDJO Putrika, Afiatry Qonita Gina Fadhilah QORY HERRAHMAWATI Ramadhani, Nadhifa Tazkia RATNA YUNIATI Ratna Lestyana Dewi Ratna Yuniarti Ratna Yuniati Ratna Yuniati Retno Lestari Riani Widiarti Rika, Amelia Salsabila Isha Siswantining, Titin Susilo Susilo Syafriana, Vilya TIARA S. KHATULISTIANI TRI JOKO SANTOSO Upi Chairun Nisa WAHYU TEGUH PRAWIRA WIBOWO MANGUNWARDOYO Windri Handayani Windya Fajira Wisnu Wardhana Yayan Hernuryadin Yuniati, Ratna Yuwana, Cynthia Putri