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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

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