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All Journal Biodiversitas Journal of Biological Diversity
SYARIFAH HIKMAH JULINDA SARI
Department Of Marine Science, Faculty Of Fisheries And Marine Sciences, Universitas Brawijaya. Jl. Veteran, Malang 65145, East Java, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Assessing the resilience of coral reefs against macroalgae invasion in the Sempu Island Nature Reserve, Malang District, Indonesia ANDIK ISDIANTO; PUTRI DEVI YORARIZKA; DIAN ALIVIYANTI; SYARIFAH HIKMAH JULINDA SARI; ADI TIYA YANUAR; MUHAMMAD ARIF ASADI; ARIEF SETYANTO; GATUT BINTORO; TRI DJOKO LELONO; DINI ATIKAWATI; AULIA LANUDIA FATHAH; BERLANIA MAHARDIKA PUTRI; SUPRIYADI SUPRIYADI; OKTIYAS MUZAKY LUTHFI
Biodiversitas Journal of Biological Diversity Vol. 25 No. 7 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250709

Abstract

Abstract. Isdianto A, Yorarizka PD, Aliviyanti D, Sari SHJ, Yanuar AT, Asadi MA, Setyanto A, Bintoro G, Lelono TD, Atikawati D, Fathah AL, Putri BM, Supriyadi, Luthfi OM. 2024. Assessing the resilience of coral reefs against macroalgae invasion in the Sempu Island Nature Reserve, Malang District, Indonesia. Biodiversitas 25: 2877-2887. The living coral cover in the Sempu Strait is known to be stuck in the range of 37% due to average data from 2009-2016. Several coral diseases have been documented in this region, which can result in the transformation of coral reefs into algae-dominated communities. This study examines the dynamic interplay between coral reefs and macroalgae within the marine ecosystems of the Sempu Island Nature Reserve, Malang District, Indonesia. Conducted across five research stations, our analysis utilized the Underwater Photo Transect (UPT) method, combined with image analysis tools CPCe and Image-J, and statistical analysis through SPSS. The findings indicate a persistent competition between corals and macroalgae, exacerbated by sedimentation from port activities and river discharges, and significant nutrient loads from human settlements. The average living coral coverage varied significantly, with a range from 12% to 53% across the study period, while macroalgae coverage showed an increase, especially in turf algae. The correlation analysis revealed a 'quite strong' relationship (r=0.783 between coral and macroalgae coverage, suggesting that increases in coral cover could potentially facilitate macroalgae proliferation under current environmental conditions. Notably, the study highlighted the critical role of water quality parameters such as temperature, pH, and salinity, which were within optimal ranges yet facilitated competitive interactions. This research underscores the complexity of coral-macroalgae relationships and the pressing need for integrated management strategies focusing on water quality and habitat preservation to ensure the resilience of these critical marine ecosystems.
Environmental determinants of reef fish community structure in Sempu Strait, East Java, Indonesia ANDIK ISDIANTO; KHALIL GIBRAN; ADE YAMINDAGO; SYARIFAH HIKMAH JULINDA SARI; ADI TIYA YANUAR; DESY SETYONINGRUM; ARIEF SETYANTO; LISA NUR HIDAYAH; KRISTINA MARSELA; MUCHAMAD FAIRUZ HAYKAL; AULIA LANUDIA FATHAH; BERLANIA MAHARDIKA PUTRI; SUPRIYADI SUPRIYADI; OKTIYAS MUZAKY LUTHFI; DWI CANDRA PRATIWI
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/d251214

Abstract

Abstract. Isdianto A, Gibran K, Yamindago A, Sari SHJ, Yanuar AT, Setyoningrum D, Setyanto A, Hidayah LN, Marsela K, Haykal MF, Fathah AL, Putri BM, Supriyadi, Luthfi OM, Pratiwi DC. 2024. Environmental determinants of reef fish community structure in Sempu Strait, East Java, Indonesia. Biodiversitas 25: 4781-4789. The Rumah Apung located in Sempu Strait, Malang District, East Java, Indonesia, is home to diverse coral reef ecosystems that provide vital ecological services and support local livelihoods. However, these ecosystems face significant threats from both natural environmental changes and anthropogenic activities. Understanding how environmental factors influence reef fish communities is critical to inform effective conservation strategies. This study investigated the influence of environmental factors on the community structure of coral reef fish in the Sempu Strait waters, East Java, using Underwater Visual Census (UVC) and Principal Component Analysis (PCA). Conducted from August 2023 to May 2024 at the Sempu Strait Floating House Station, this study aimed to assess the impact of water quality, substrate type, and food availability on the diversity and abundance of coral reef fish. The main results revealed a significant correlation between the community structure of coral reef fish and environmental variables such as water clarity, salinity (r = 0.65, p<0.01), pH (r = 0.55, p<0.05), dissolved oxygen (r = 0.70, p<0.01), and sediment type. Seasonal variations significantly affected water quality, with cold nutrient-rich water during the east monsoon increasing fish biomass by about 30%. Human activities, especially recreational diving and fishing activities, were correlated with a 20% decline in coral reef fish populations, highlighting the anthropogenic pressure on this ecosystem. PCA provides insight into the complex interdependencies within coral reef ecosystems, illustrating how multiple environmental factors combine to influence reef fish dynamics. The study concludes that effective management and conservation strategies, such as establishing marine protected areas, implementing community-based monitoring programs, and promoting sustainable tourism practices, are essential, supported by regular environmental monitoring, are essential to maintain the biodiversity and ecological integrity of coral reefs in the Sempu Strait. These strategies should address both natural environmental changes and anthropogenic impacts to mitigate their adverse effects on coral reef ecosystem conditions.
Plankton diversity around Sempu Strait, Indonesia, revealed by eDNA metabarcoding DIAN ALIVIYANTI; SHAFIRA HAPSARI NOOR AMALIA; MUHAMMAD DAILAMI; ASEP AWALUDIN PRIHANTO; SYARIFAH HIKMAH JULINDA SARI; HEDER DJAMALUDIN; EKWAN NOFA WIRATNO
Biodiversitas Journal of Biological Diversity Vol. 26 No. 11 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d261141

Abstract

Abstract. Aliviyanti D, Amalia SHN, Dailami M, Prihanto AA, Sari SHJ, Djamaludin H, Wiratno EN. 2025. Plankton diversity around Sempu Strait, Indonesia, revealed by eDNA metabarcoding. Biodiversitas 26: 5848-5856. Plankton diversity plays a critical role in assessing marine ecosystem health and productivity. Environmental DNA (eDNA) metabarcoding offers a highly informative tool for detecting plankton biodiversity more comprehensively compared to conventional methods. This study assessed plankton diversity and water quality in the Sempu Strait, Indonesia, by analyzing eDNA samples collected from five stations during a single sampling period in August 2024. Environmental parameters (temperature, salinity, pH, dissolved oxygen, nitrate, and phosphate) were measured and found within typical ranges, except for nitrate and phosphate, which exceeded marine quality thresholds. Water samples were filtered and amplified using the 18S V9 region, and sequences were processed using DADA2 and assigned taxonomically against the PR2 database. A total of 361 species across 341 genera were identified from 2.8 million raw reads. The Shannon-Wiener index (H') diversity indices range from 4.61 to 6.43, while Simpson's index (D) ranges from 0.964-0.997, indicating overall high alpha diversity. The most dominant phytoplankton genera were Leptocylindrus and Chaetoceros, while Neocalanus dominated the zooplankton community. Stations near anthropogenic activity showed distinct taxonomic profiles and higher nutrient concentrations. These findings confirm that eDNA metabarcoding is an effective and sensitive approach for monitoring marine plankton communities. This method enhances biodiversity detection and provides valuable reference for future ecological assessments and conservation planning in Indonesian coastal ecosystems.
Co-Authors Ade Yamindago ADI TIYA YANUAR ADI TIYA YANUAR ANDIK ISDIANTO ANDIK ISDIANTO ARIEF SETYANTO ARIEF SETYANTO ASEP AWALUDIN PRIHANTO AULIA LANUDIA FATHAH BERLANIA MAHARDIKA PUTRI BERLANIA MAHARDIKA PUTRI Desy Setyoningrum DIAN ALIVIYANTI DIAN ALIVIYANTI DINI ATIKAWATI DWI CANDRA PRATIWI EKWAN NOFA WIRATNO GATUT BINTORO HEDER DJAMALUDIN KHALIL GIBRAN KRISTINA MARSELA LISA NUR HIDAYAH MUCHAMAD FAIRUZ HAYKAL MUHAMMAD DAILAMI MUHAMMAD ARIF ASADI OKTIYAS MUZAKY LUTHFI PUTRI DEVI YORARIZKA SHAFIRA HAPSARI NOOR AMALIA SUPRIYADI SUPRIYADI TRI DJOKO LELONO