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Stand Structure and Degradation Level of Mangrove Vegetation in Pongkar Village, Karimun Regency, Kepulauan Riau, Indonesia Hasibuan, Muhammad Alfandi; Efendi, Yarsi; Agustina, Fenny; Puspita, Lani
JURNAL PEMBELAJARAN DAN BIOLOGI NUKLEUS Vol 11, No 3: Jurnal Pembelajaran Dan Biologi Nukleus September 2025
Publisher : Universitas Labuhanbatu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jpbn.v11i3.7924

Background: Mangrove ecosystems are globally significant for biodiversity, carbon storage, and coastal protection, yet they are increasingly threatened by anthropogenic activities. Indonesia, which hosts the world’s largest mangrove area, also experiences one of the highest degradation rates, making site-specific assessments essential. This study investigates the stand structure and degradation level of mangrove vegetation in Pongkar Village, Karimun Regency, Riau Islands Province, where ecological importance intersects with human pressures. Methodolgy: Field surveys were conducted using five 100 m transects with 10 × 10 m plots for vegetation analysis and a 1 ha plot to assess degradation levels following the Indonesian Ministry of Environment Decree No. 201/2004. Vegetation parameters, including density, frequency, dominance, and Importance Value Index (IVI), were measured. Results: Nine mangrove species were identified, comprising seven true mangroves and two associated species. Rhizophora apiculata dominated the community (density 0.078 ind/m²; IVI 121.15%). Diversity indices revealed medium diversity (H′ = 1.45–1.89), low to medium richness (Dmg = 1.28–1.78), high evenness (E = 0.81–0.86), and low dominance (D = 0.18–0.26). Stand density reached 1,181 trees/ha, classified as medium.These results suggest that ecological functions remain active, but moderate diversity and richness indicate vulnerability to disturbance and degradation risks. Contribution: The study provides empirical evidence to inform conservation planning, emphasizing the need for regular monitoring, rehabilitation of underrepresented species, and community-based management to sustain the Pongkar mangrove ecosystem

Morphometric and Length–Weight Relationships of Three Penaeid Shrimp Species in the Waters of Jaloh Island, Batam City Masni, Masni; Syamsi, Fauziah; Efendi, Yarsi
JURNAL PEMBELAJARAN DAN BIOLOGI NUKLEUS Vol 11, No 3: Jurnal Pembelajaran Dan Biologi Nukleus September 2025
Publisher : Universitas Labuhanbatu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jpbn.v11i3.7662

Background: Understanding the relationship between body length and weight in commercially essential shrimp species is crucial for assessing growth patterns and estimating biomass. This study aims to evaluate the relationship between body length and weight in three species of shrimp, namely the whiteleg shrimp (Penaeus merguensis), whiteleg shrimp (Litopenaeus vannamei), and tiger shrimp (Penaeus monodon), as a basis for fisheries management in the waters of Jaloh Island, Batam City. Methodology: The samples were collected randomly from the results, catching fishermen at three stations during a day of data collection. Morphometric measurements were conducted on 180 individual, namely whiteleg shrimp (P. merguensis), White shrimp (L. vannamei), and Tiger shrimp (P. monodon). The length-weight relationship has been analyzed for a long time using simple regression using Excel software. The connection between character morphometrics and total length was analyzed with ANCOVA using SPSS 27 software. Findings: The results showed the determinant coefficient of three species shrimp in this study indicates a very close relationship between the growth of length and weight of shrimp. In the P. monodon species, it is known that approximately 78 % of the weight gain is attributed to the increase in shrimp length, while 22 % is attributed to other factors. Characters that influence the total length of the three species are generally overall, where P. merguensis is more influenced by the tail and weight, L. vannamei by the front, back, and body mass, while P. monodon involves almost all parts of the body. Contribution: This approach helps estimate biomass, identify morphological variations between species, and provides a scientific basis in supporting efforts to manage shrimp resources sustainably

Thematic Analysis Of Accreditation And Iso 21001 At Higher Education Institution In Batam Efendi, Yarsi; Hapsari, Ratna F; Yusup, Rhisna Rachmawati
International Journal of Management, Innovation, and Education Vol 4, No 1 (2025): International Journal of Management, Innovation, and Education
Publisher : Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/ijmie.v4i1.12721

Higher education in Indonesia, particularly in Batam, must adapt to global demands to enhance quality through the implementation of the international standard ISO 21001:2018. This research aims to explore the gap between national accreditation and the understanding and application of ISO 21001:2018 in higher education institutions. Using a literature review approach, the study identifies the need for a deeper understanding of the standard, as well as the challenges faced by institutions, such as resistance to change and resource limitations. The findings indicate that, despite significant potential for improving educational quality through ISO 21001:2018, many institutions have yet to prioritise its implementation. Therefore, socialisation, training, and government support are crucial to ensure the effective application of this standard to enhance the competitiveness of educational institutions at both regional and international levels

Thematic Analysis Of Accreditation And Iso 21001 At Higher Education Institution In Batam Efendi, Yarsi; Hapsari, Ratna F; Yusup, Rhisna Rachmawati
International Journal of Management, Innovation, and Education Vol 4, No 1 (2025): International Journal of Management, Innovation, and Education
Publisher : Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/ijmie.v4i1.12721

Higher education in Indonesia, particularly in Batam, must adapt to global demands to enhance quality through the implementation of the international standard ISO 21001:2018. This research aims to explore the gap between national accreditation and the understanding and application of ISO 21001:2018 in higher education institutions. Using a literature review approach, the study identifies the need for a deeper understanding of the standard, as well as the challenges faced by institutions, such as resistance to change and resource limitations. The findings indicate that, despite significant potential for improving educational quality through ISO 21001:2018, many institutions have yet to prioritise its implementation. Therefore, socialisation, training, and government support are crucial to ensure the effective application of this standard to enhance the competitiveness of educational institutions at both regional and international levels

Pengembangan Instrumen Kepemimpinan Trasnformasional Sekolah Dasar Jombang 03 Kota Tangerang Selatan Wulansari, Desi K; Efendi, Yarsi; Inayati, Dinda Nurul; Hapsari, Ratna F; Hidayat, Rais
Jurnal Pendidikan dan Pembelajaran Indonesia (JPPI) Vol. 5 No. 2 (2025): Jurnal Pendidikan dan Pembelajaran Indonesia (JPPI), 2025 (2)
Publisher : Yayasan Pendidikan Bima Berilmu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53299/jppi.v5i2.1321

Kepemimpinan transformasional adalah kepemimpinan yang menghasilkan pada kemampuan kepala sekolah untuk melakukan perubahan mendalam yang mendorong inovasi dan kreativitas, yang bertujuan untuk mewujudkan visi yang telah di tetapkan. Sehingga tercipta lingkungan belajar yang mendukung pengembangan profesionalitas guru. Penelitian ini bertujuan untuk mengembangkan dan menguji instrumen kepemimpinan transformasional kepala sekolah dasar. Penelitian ini menggunakan metode survei deskriptif kuantitatif dengan kuesioner sebagai alat pengumpul data dengan skala pengukuran Likert dari 1 sampai 5, dengan total 24 pertanyaan yang mencakup empat aspek kepemimpinan transformasional yaitu Pengaruh Ideal, Motivasi Inspirasi, Stimulasi Intelektual, Pertimbangan Individual. Penelitian ini menggunakan quota sampling untuk memilih 27 pendidik dan 6 tenaga kependidikan sekolah dari SDN Jombang 03 di Kota Tangerang Selatan dari populasi pendidik dan staf sekolah yang lebih besar di kota tersebut. Dengan Cronbach's Alpha sebesar 0,997, pernyataan instrumen tersebut valid dan dapat dipercaya, sesuai dengan temuan penelitian. Statistik deskriptif menunjukkan persepsi positif terhadap kepemimpinan transformasional kepala sekolah dengan rata-rata skor tinggi pada dimensi Pengaruh Ideal, Motivasi Inspirasi, Stimulasi Intelektual, Pertimbangan Individual. Temuan ini tidak hanya memperkuat teori kepemimpinan transformasional dalam konteks pendidikan dasar tetapi juga menyediakan alat yang efektif untuk evaluasi dan pengembangan kepemimpinan. Instrumen yang dikembangkan dapat digunakan untuk menilai dan meningkatkan efektivitas kepemimpinan kepala sekolah, memberikan implikasi praktis bagi pengawas pendidikan dan pembuat kebijakan dalam meningkatkan kualitas pendidikan dasar.

Density and distribution of holothuria leucospilota along the coast of dedap island, pulau abang waters Wiranto, Ijal; Efendi, Yarsi; Agustina, Fenny
JPBIO (Jurnal Pendidikan Biologi) Vol 10, No 1 (2025): April 2025
Publisher : STKIP Persada Khatulistiwa Sintang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31932/jpbio.v10i1.4532

The black rubber sea cucumber (Holothuria leucospilota) is prevalent along the coast of Dedap Island in Batam, unlike other sea cucumber species that face significant fishing pressure. This study examines the population and distribution of Holothuria leucospilota near Dedap Island in Abang Island, Batam. Surveys were conducted at three sites, where we carefully counted and mapped the sea cucumbers. A total of 236 individuals were recorded, with the highest density in Transect 1 (0.97/m²) and the lowest in Transect 2 (0.66/m²). Our results indicate notable variability in sea cucumber density across the surveyed areas, with some locations showing high abundance and others fewer individuals. The distribution pattern, assessed using the Morisita Index, suggested a clustering tendency, especially in Transect 1. We also examined substrate types to better understand these distribution trends. Additionally, water quality assessments showed that conditions across the transects were favourable for sea cucumber survival, with suitable levels of salinity, pH, and dissolved oxygen. These findings are vital for the management and conservation of sea cucumbers in the area.

Exploration of Community Structure and Density of Sea Cucumbers (Holothuroidea) in the Tropical Waters of Abang Island, Batam Savitri, Yulia; Efendi, Yarsi; Syamsi, Fauziah
JURNAL PEMBELAJARAN DAN BIOLOGI NUKLEUS Vol 11, No 3: Jurnal Pembelajaran Dan Biologi Nukleus September 2025
Publisher : Universitas Labuhanbatu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jpbn.v11i3.7695

Background: Coral reef ecosystems in tropical waters are highly productive and biodiverse, with sea cucumbers (Holothuroidea) serving essential ecological functions as detritivores, contributing to nutrient cycling, sediment bioturbation, and substrate quality. Despite their ecological and economic significance, data on the community structure and density of sea cucumbers in Abang Island remain scarce. This study aimed to assess the species composition, density, and ecological patterns of Holothuroidea in the tropical waters of Abang Island, Batam. Methodology: Field surveys were conducted using a transect-quadrat method, with environmental parameters (temperature, salinity, pH, dissolved oxygen) measured in situ. Findings: Five species were recorded: Holothuria leucospilota, H. atra, H. scabra, H. fuscocinerea, and H. pardalis. Species composition was dominated by H. leucospilota at Station 1 and H. fuscocinerea at Station 2. The highest density was 0.130 ind/m² for H. leucospilota at Station 1, and 0.150 ind/m² for H. fuscocinerea at Station 2. Community analysis showed greater diversity at Station 1 (H′ = 1.07) but higher dominance at Station 2 (D = 0.691). Pearson correlation indicated that salinity and temperature were the most influential factors affecting abundance, varying by habitat type. These results suggest that habitat characteristics, particularly substrate and vegetation, shape species distribution in small island ecosystems. Contribution: This study provides the first baseline data on sea cucumbers in Abang Island, offering novel insights into the linkage between environmental parameters and species-specific distribution patterns, and supporting conservation and sustainable management of these ecologically and economically valuable resources

Population Structure and Anthropogenic Pressure of Sea Urchin Utilisation (Diadema setosum) on Shallow Coral Reefs of Dedap Island, Batam Manihuruk, Pitrin Octca; Efendi, Yarsi; Syamsi, Fauziah
JURNAL PEMBELAJARAN DAN BIOLOGI NUKLEUS Vol 11, No 3: Jurnal Pembelajaran Dan Biologi Nukleus September 2025
Publisher : Universitas Labuhanbatu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jpbn.v11i3.7920

Background: Diadema setosum is a key species in maintaining coral reef stability through its role in controlling algal growth. However, exploitation for consumption and trade of its gonads by coastal communities has generated anthropogenic pressures that threaten population sustainability. This study aims to assess the population structure and utilisation pressure on D. setosum in the shallow coral ecosystem of Dedap Island, Batam City. Methodology: Observations were carried out at five stations using a 50-metre belt transect method with 5×5 m quadrat plots. Data were analysed through descriptive statistics to determine density and distribution, while correlation and regression analyses were applied to examine the influence of environmental parameters (temperature, dissolved oxygen, salinity, and pH). Structured quantitative interviews with local fishermen were conducted to obtain information on harvesting practices. Results: The population density ranged from 0.180 to 0.292 ind/m², with a clustered distribution pattern observed at stations farther from human activity. Regression results indicated that temperature significantly increased density, while dissolved oxygen and pH had significant negative effects. Fishermen reported daily harvesting during low tide with yields of 2–3 kg of gonads per person. These findings demonstrate exploitation pressure on D. setosum, underscoring the need for ecosystem-based management. Contribution: The novelty of this study lies in integrating ecological surveys with socio-economic data, offering comprehensive insights for locally adapted conservation strategies.

Community structure and exploitation pressure of giant clam in dedap island-abang waters batam Meilanda, Yuria Liza; Efendi, Yarsi; Agustina, Fenny
JPBIO (Jurnal Pendidikan Biologi) Vol 10, No 2 (2025): November 2025
Publisher : STKIP Persada Khatulistiwa Sintang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31932/jpbio.v10i2.5257

The community structure of Tridacnidae in the shallow coral waters of Dedap Island, Batam, has been analysed through a quantitative approach to reveal ecological dynamics and exploitation pressures from the surrounding communities. This study employed transect methods and ecological index analysis, including Shannon-Wiener diversity (H?), evenness (E), and Simpson's dominance (D) across five observation stations. The results indicate a high dominance of Tridacna crocea in locations with low exploitation pressure, whereas T. maxima and T. squamosa, which are still hunted by the local population, exhibit limited abundance. Pearson correlation revealed that dissolved oxygen (DO) has a strong positive relationship with H? and E, and a negative relationship with D, while temperature showed an inverse relationship. The integration of ecological analysis with socio-ecological factors revealed that anthropogenic exploitation pressures also shape community structure spatially. This study offers a holistic approach to the conservation management of Tridacnidae based on community participation and habitat zoning, while simultaneously addressing gaps in ecological and social research in the coral reef areas of western Indonesia.

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