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OKTIYAS MUZAKY LUTHFI
Institute of Marine and Environmental Sciences, University of Szczecin. Mickiewicza 16a, Szczecin, 70-383, Poland
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Reef fish monitoring as a coral reef resilience indicator in the Sempu Strait, South of East Java, Indonesia GATUT BINTORO; ANDIK ISDIANTO; NUDDIN HARAHAB; ANDI KURNIAWAN; AGUS DWI WICAKSONO; RELIA MAHARDITHA; AULIA LANUDIA FATHAH; BERLANIA MAHARDIKA PUTRI; MUCHAMAD FAIRUZ HAYKAL; MUHAMMAD ARIF ASADI; ARIEF SETYANTO; TRI DJOKO LELONO; OKTIYAS MUZAKY LUTHFI; DWI CANDRA PRATIWI
Biodiversitas Journal of Biological Diversity Vol. 24 No. 9 (2023)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d240938

Abstract

Abstract. Bintoro G, Isdianto A, Harahab N, Kurniawan A, Wicaksono AD, Maharditha R, Fathah AL, Putri BM, Haykal MF, Asadi MA, Setyanto A, Lelono TD, Luthfi OM, Pratiwi DC. 2023. Reef fish monitoring as a coral reef resilience indicator in the Sempu Strait, South of East Java, Indonesia. Biodiversitas 24: 4950-4959. Sempu Island is designated as a nature reserve which is surrounded by a fairly high diversity of coral reefs. Since the high activities of fishing ports near this island, the anthropogenic pressure seriously became a threat to the biodiversity of coral reefs in this nature reserve. Continuous observation of reef fish is an important activity to monitor the coral reef health condition. Since then, bimonthly monitoring using an underwater visual census has been conducted from October 2021 to May 2022. Based on these observations obtained that the average reef fish abundance was in the "low" category, namely 0.516 ind/m2 in October 2021, 0.527 ind/m2 in December 2021, 0.522 ind/m2 in February 2022, and 0.378 ind/m2 in May 2022. The abundance of reef fish obtained consisted of three categories: indicators, targets, and majors. Overall, the Pomacantridae family, from the major fish category, has the largest abundance compared to other families. While the range of coral coverage was 6-21.3%, which was included in the "bad" category. There was a relationship with a value of 0.462 (medium) between coral cover and fish abundance. The abundance of reef fish at 21.4% was influenced by coral cover, while the remaining 78.6% was influenced by other factors outside of the tested variables. The decline in reef fish abundance in 2015-2022 can be caused by a decrease in coral cover in the Sempu Strait.
Coral disease prevalence and compromised health in the Sempu Island Nature Reserve, Malang District, Indonesia ANDIK ISDIANTO; ANGGER RIO FEWILA; SEFTIAWAN SAMSU RIJAL; ARIEF SETYANTO; AULIA LANUDIA FATHAH; DINI ATIKAWATI; BERLANIA MAHARDIKA PUTRI; INTAN DWI PUSPITASARI; OKTIYAS MUZAKY LUTHFI
Biodiversitas Journal of Biological Diversity Vol. 25 No. 4 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250408

Abstract

Abstract. Isdianto A, Fewila AR, Rijal SS, Setyanto A, Fathah AL, Atikawati D, Putri BM, Puspitasari ID, Luthfi OM. 2024. Coral disease prevalence and compromised health in the Sempu Island Nature Reserve, Malang District, Indonesia. Biodiversitas 25: 1404-1412. Since the Dutch colonialization era, the Malang District's Sempu Strait has been designated a natural reserve. Environmental changes and human activities have contributed to the 14.28% coral cover in the Sempu Strait. This study aims to assess coral health in the Sempu Strait and detect coral diseases or compromised conditions. At five stations, data were gathered utilizing the Underwater Photo Transect method with a 10-meter interval and a 1x1 meter transect implemented across 100 meters. The average coral cover in Sempu Strait is 14.28%, considered inadequate according to categories for determining coral reef status. Fish Bite, Black Band Disease (BBD), Ulcerative White Spots (UWS), Non-Focal Bleaching (NFBL), Trematodiasis, and Pigmentation Response are the six categories of coral reef diseases that have been identified. Sediment damage is the only compromised health condition that has been identified. With an average prevalence of 15.35%, Non-Focal Bleaching (NFBL) is the most prevalent disease; Black Band Disease (BBD) has the lowest prevalence at 0.8%. The insufficient coral coverage in the Strait of Sempu is caused by the surrounding environmental conditions that stress corals to the point where the prevalence of coral-eating diseases is increased.
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.
Community structure and biomass of reef fish concerning coral cover in Sempu Strait, East Java, Indonesia ANDIK ISDIANTO; MUHAMMAD FIKRI ARIEFANDI; MUHAMMAD ARIF ASADI; ADE YAMINDAGO; FAHREZA OKTA SETYAWAN; GATUT BINTORO; ARIEF SETYANTO; TRI DJOKO LELONO; AGUS TUMULYADI; WIRASTIKA ADHIHAPSARI; DESY SETYONINGRUM; AULIA LANUDIA FATHAH; BERLANIA MAHARDIKA PUTRI; SUPRIYADI SUPRIYADI; OKTIYAS MUZAKY LUTHFI
Biodiversitas Journal of Biological Diversity Vol. 25 No. 8 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250808

Abstract

Abstract. Isdianto A, Ariefandi MF, Asadi MA, Yamindago A, Setyawan FO, Bintoro G, Setyanto A, Lelono TD, Tumulyadi A, Adhihapsari W, Setyoningrum D, Fathah AL, Putri BM, Supriyadi, Luthfi OM. 2024. Community structure and biomass of reef fish concerning coral cover in Sempu Strait, East Java, Indonesia. Biodiversitas 25: 3376-3385. Reef fishes were used as bioindicators of biodiversity in coral reef ecosystems. However, coral cover and reef fish abundance around Sempu Strait tended to decrease. The study aims to obtain reef fish's community structure and biomass and their correlation to coral cover. We observed significant variability in reef fish populations through bi-monthly monitoring using an underwater visual census and underwater photo transect conducted from December 2022 to April 2023. Based on these observations, the average range of coral fish abundance was 0.453 to 0.577 individuals per square meter, with the highest value at Rumah Apung station (0.577 ind/m2). The community structure included 81 reef fish species, categorized into major (50 species), indicator (10 species), and target (21 species) groups, demonstrating a community with moderate diversity, stable evenness, and low dominance across the observed stations. Further, the research quantified fish biomass, recording an average of 0.0207 kg/m2 or 207.571 kg/Ha, categorized as low, with the highest biomass measurements at Rumah Apung station (0.0054 kg/m2). Strong correlations were identified between coral cover and both fish abundance (correlation coefficient = 0.741) and biomass (correlation coefficient = 0.666). These results emphasize the profound impact of coral health on the conditions and sustainability of reef fish populations. These findings underscore the critical dependency of reef fish on coral ecosystems and provide essential data for conservation efforts to maintain and restore these vital marine habitats.
Assessing the relationship between coral cover and coral recruitment in the degraded ecosystems of Sempu Nature Reserve, East Java, Indonesia ANDIK ISDIANTO; RIDHA AYU WIBOWO; AMELINDA VIVIAN KUDRATI; DIAN ALIVIYANTI; MUHAMMAD ARIF ASADI; CITRA SATRYA UTAMA DEWI; ARIEF SETYANTO; TRI DJOKO LELONO; AGUS TUMULYADI; LISA NUR HIDAYAH; AULIA LANUDIA FATHAH; BERLANIA MAHARDIKA PUTRI; NOVAR KURNIA WARDANA; SUPRIYADI SUPRIYADI; OKTIYAS MUZAKY LUTHFI
Biodiversitas Journal of Biological Diversity Vol. 25 No. 9 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250929

Abstract

Abstract. Isdianto A, Wibowo RA, Kudrati AV, Aliviyanti D, Asadi MA, Dewi CSU, Setyanto A, Lelono TD, Tumulyadi A, Hidayah LN, Fathah AL, Putri BM, Wardana NK, Supriyadi, Luthfi OM. 2024. Assessing the relationship between coral cover and coral recruitment in the degraded ecosystems of Sempu Nature Reserve, East Java, Indonesia. Biodiversitas 25: 3075-3083. The long-term survival of coral ecosystems requires the existence of coral recruitment variables that function as agents for future coral generations. The efficacy of this recruitment is crucial for the coral ecology in Sempu Waters, which is renowned for its ongoing loss in coverage. This research aims to determine hard coral cover, the number of coral recruits, and the correlation between hard coral cover and the number of coral recruits. Data was collected using the underwater photo transect method, a widely accepted and reliable technique for assessing coral cover and diversity, at five research stations during 3 observation periods (December 2022, February 2023, and April 2023) and then analyzed using pearson correlation to determine the relationship between the percentage of coral cover and the number of coral recruits. The results show that the coral cover of the Sempu Strait is classified as damaged and has decreased for 3 consecutive months, namely 14.28, 13.92, and 12.57%, and only 22 coral recruits were found in total with 6 identified genera, including Seriatopora, Porites, Pocillopora, Goniastrea, Pavona, and Acropora. The correlation between hard coral cover and coral recruits shows a positive relationship and a fragile level of closeness (r = 0.1119). The availability of stable substrates for recruitment, such as Dead Coral with Algae (DCA), Dead Coral (DC), and Rock (RK), can increase the potential for successful recruitment. However, coral recruits in the Sempu Strait also face competition from other biota, such as macroalgae and adult corals themselves.
Population and distribution patterns of juvenile scleractinian corals in Sempu Island Nature Reserve, East Java, Indonesia ANDIK ISDIANTO; SYAFRIAL YANUAR ISHAQ; ADE YAMINDAGO; FENI IRANAWATI; ADI TIYA YANUAR; LISA NUR HIDAYAH; KRISTINA MARSELA; WIRASTIKA ADHIHAPSARI; TRI DJOKO LELONO; AULIA LANUDIA FATHAH; DINI ATIKAWATI; BERLANIA MAHARDIKA PUTRI; NOVAR KURNIA WARDANA; SUPRIYADI SUPRIYADI; OKTIYAS MUZAKY LUTHFI
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/d251010

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Abstract. Isdianto A, Ishaq SY, Yamindago A, Iranawati F, Yanuar AT, Hidayah LN, Marsela K, Adhihapsari W, Lelono TD, Fathah AL, Atikawati D, Putri BM, Wardana NK, Supriyadi, Luthfi OM. 2024. Population and distribution patterns of juvenile scleractinian corals in Sempu Island Nature Reserve, East Java, Indonesia. Biodiversitas 25: 3480-3490. Coral reefs, which play a vital role in tropical marine ecosystems, are threatened by anthropogenic and natural stressors, despite their important ecological and economic roles. This study examines the resilience of coral ecosystems through the lens of juvenile coral populations at Floating House Beach, which is part of the Sempu Island Nature Reserve, East Java, Indonesia. Using the Underwater Photo Transect (UPT) method along a 100-meter reference line with a 1 × 1-meter transect, our study found that coral cover was severely damaged, with live coral cover of only 18.67% and 17.61% at two observation stations, which was dominated by the life form CM (Coral Massive) at both stations. However, twelve juvenile coral genera were identified that showed potential for natural recovery, namely Acropora, Favia, Favites, Galaxea, Leptoseris, Montipora, Mycedium, Platygyra, Pocillopora, Porites, Stylophora, and Turbinaria. Juvenile coral densities were low, at 0.55 and 0.88 colonies/m², indicating a very low coral recruitment category with Pocillopora being the most common. Spatial distribution, analyzed using the Morisita Index, showed a predominantly clumped arrangement (Ip>0), indicating non-random aggregation of juveniles. The results of this study highlight the significant impact of environmental stressors on juvenile coral communities and underscore the urgent need for targeted conservation efforts to support coral resilience and recovery.
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

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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.
Co-Authors ADE YAMINDAGO ADE YAMINDAGO ADI TIYA YANUAR ADI TIYA YANUAR ADI TIYA YANUAR AGUS TUMULYADI AGUS TUMULYADI AGUS DWI WICAKSONO AMELINDA VIVIAN KUDRATI ANDI KURNIAWAN ANDIK ISDIANTO ANDIK ISDIANTO ANDIK ISDIANTO ANGGER RIO FEWILA ARIEF SETYANTO ARIEF SETYANTO ARIEF SETYANTO ARIEF SETYANTO AULIA LANUDIA FATHAH AULIA LANUDIA FATHAH AULIA LANUDIA FATHAH BERLANIA MAHARDIKA PUTRI BERLANIA MAHARDIKA PUTRI BERLANIA MAHARDIKA PUTRI BERLANIA MAHARDIKA PUTRI CITRA SATRYA UTAMA DEWI DESY SETYONINGRUM DESY SETYONINGRUM DIAN ALIVIYANTI DIAN ALIVIYANTI DINI ATIKAWATI DINI ATIKAWATI DWI CANDRA PRATIWI DWI CANDRA PRATIWI FAHREZA OKTA SETYAWAN FENI IRANAWATI GATUT BINTORO GATUT BINTORO INTAN DWI PUSPITASARI KHALIL GIBRAN KRISTINA MARSELA KRISTINA MARSELA LISA NUR HIDAYAH LISA NUR HIDAYAH MUCHAMAD FAIRUZ HAYKAL MUCHAMAD FAIRUZ HAYKAL MUHAMMAD ARIF ASADI MUHAMMAD ARIF ASADI MUHAMMAD ARIF ASADI MUHAMMAD FIKRI ARIEFANDI NOVAR KURNIA WARDANA NOVAR KURNIA WARDANA NUDDIN HARAHAB PUTRI DEVI YORARIZKA RELIA MAHARDITHA RIDHA AYU WIBOWO SEFTIAWAN SAMSU RIJAL SUPRIYADI SUPRIYADI SUPRIYADI SUPRIYADI SYAFRIAL YANUAR ISHAQ SYARIFAH HIKMAH JULINDA SARI SYARIFAH HIKMAH JULINDA SARI TRI DJOKO LELONO TRI DJOKO LELONO TRI DJOKO LELONO TRI DJOKO LELONO WIRASTIKA ADHIHAPSARI WIRASTIKA ADHIHAPSARI