Jurnal Kelautan Tropis最新文献

{"title":"Korelasi Konsentrasi Mikroplastik dengan Material Padatan Tersuspensi (MPT) di Perairan Delta Sungai Bodri, Kendal, Jawa Tengah","authors":"Sri Yulina Wulandari, Bambang Yulianto, O. K. Radjasa, Dwi Haryo Ismunarti, Sri Sedjati","doi":"10.14710/jkt.v25i3.16121","DOIUrl":"https://doi.org/10.14710/jkt.v25i3.16121","url":null,"abstract":"The Bodri river flow in Kendal Regency is a transportation route for sedimentary materials, waste disposal or garbage resulting from human activities on land to sea waters. One type of waste that is often found is plastic packaging. Until now, the use of plastic products is still high in society. In the environment, plastic waste (including that used for packaging) is difficult to decompose or degrade, but only fragmented into smaller sizes called microplastics. Microplastics (particle size < 5 mm) are widely distributed throughout aquatic ecosystems. Microplastics are one of the pollutants that can affect the food cycle for organisms in coastal and marine areas. This study was aimed to determine the relationship between the concentration of microplastics and suspended solids (MPT) at high tide and low tide. A total of 16 water samples were taken from eight (8) purposively determined stations. Sampling was carried out in July 2019 (dry season) during high and low tides. The research method used was descriptive quantitative. The concentration of microplastics was determined by the method recommended by NOAA, while the determination of the concentration of MPT was carried out by the gravimetric method. The results showed that the average concentration of microplastics at high tide was 2.207 mg/L compared to 2.615 mg/L at low tide. The average MPT concentration at high tide is 193 mg/L lower than at low tide, which was 419 mg/L. It could be said that the high mean concentration of microplastic and MPT at low tide indicated that more microplastic and MPT sourced from the mainland. By the statistical test using the Pearson correlation method, the relationship between microplastics and MPT was in the weak category. MPT affected the presence of microplastics only by 3.19% (with a coefficient of determination of 0.0319 and a p-value of 0.508). The presence of microplastics was not only caused by the presence of MPT, but was mostly thought to be influenced by other factors. Aliran sungai Bodri di Kabupaten Kendal menjadi jalur transportasi bahan sedimen, buangan limbah atau sampah hasil dari aktivitas manusia di daratan menuju ke perairan laut. Salah satu jenis buangan sampah yang banyak dijumpai adalah plastik kemasan. Sampai sekarang, penggunaan produk plastik masih tinggi di masyarakat. Di lingkungan, sampah plastik (termasuk yang digunakan sebagai kemasan) sulit terurai, tetapi hanya terfragmentasi menjadi ukuran yang lebih kecil yang disebut mikroplastik. Mikroplastik (ukuran partikel < 5 mm) tersebar luas di seluruh ekosistem perairan. Mikroplastik menjadi salah polutan yang dapat mempengaruhi siklus makanan bagi organisme di wilayah pesisir dan laut. Penelitian ini bertujuan untuk mengetahui hubungan antara konsentrasi mikroplastik dengan material padatan tersuspensi (MPT) pada saat pasang dan surut. Sebanyak 16 sampel air diambil dari 8 stasiun yang ditentukan secara purposif. Pengambilan sampel dilakukan pada bulan Juli 2019 (musim kemarau) saat ","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45763521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Alginate from Sargassum sp. Improve the Hematology Performance and Oxygen Tolerance Exposure of Lates calcarifer","authors":"E. Yudiati, Ali Djunaedi, N. Azhar, R. Alghazeer","doi":"10.14710/jkt.v25i3.16217","DOIUrl":"https://doi.org/10.14710/jkt.v25i3.16217","url":null,"abstract":"Indonesia's fish production is abundant, especially in aquaculture. Lates calcarifer is farmed fish species. The failure of L. calcarifer cultivation due to disease problems. We are utilizing a natural compound derived from tropical Sargassum sp. extracts, namely alginate. This study aims to determine and analyse the supplementation of alginate in the diet by oral administration to improve the fish's hematological performance and oxygen stress tolerance. There were one control and three treatments (2 g.kg-1, 4 g.kg-1, and 8 g.kg-1 alginate/feed). The experiment was a completely randomized design with three replications. Fish were reared in a 350 L fiber tank for 12 days at a density of 20 ind.tank-1. Stress oxygen tolerance was applied by rearing the 10 fish in 12 L fully plastic-wrapped containers. The parameters test analyzed were phagocytic activity and phagocytic index, red blood parameters which are hematocrit and hemoglobin. The survival rate after 5 hr anoxic exposure was also recorded. The best treatments were achieved at a dose of 6 g.kg-1 and 8 g.kg-1in all parameters, except the phagocytic index. The alginate addition at all oxygen stress treatments also performed a better survival rate compared to the control. Adding alginate to feed as feed supplementation by oral administration can boost hematological performance and higher tolerance from oxygen stress exposure.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44781128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Karakteristik Mikroplastik pada Sedimen dan Air laut di Muara Sungai Wulan Demak","authors":"Nando Arta Gusti Pamungkas, Retno Hartati, Sri Redjeki, Ita Riniatsih, Jusup Suprijanto, Edy Supriyo, Widianingsih Widianingsih","doi":"10.14710/jkt.v25i3.14923","DOIUrl":"https://doi.org/10.14710/jkt.v25i3.14923","url":null,"abstract":"Microplastics are small plastic particles that have the characteristics of easily accumulating in seawater and sediments with a diameter of less than 5 mm. The presence of microplastics in seawater and sediments may have a chain impact on marine ecosystems and humans. The purpose of this study was to determine the characteristics of microplastics in sediment and seawater in the Wulan River Estuary, Demak. Sediment and seawater samples were taken by purposive sampling at five different stations in line with the river mouth on 20 May 2021. Visual identification and counting of microplastics using a microscope, and FTIR (Fourier transform infrared) test. The highest abundance of microplastics was found in Station 2 sediment (400 particles.Kg-1) and Station 1 seawater (99 particles.L-1) which is the end of the Wulan river flow. The diversity of microplastic characteristics in the form of fragments, fibers, pellets and films, the most abundance was fragments of particles in sediment and seawater samples. The color of the microplastic particles is predominantly black and blue, with lesser number of brown, white, red, green, yellow and purple. The microplastic particle size range was found between 1.00-259.06 m. Microplastic pollutants are nitrile, nylon and PTFE (Polytetrafluoroethylene) plastics. The results of this study reveal the sources of anthropogenic pollution in the study area which are not only caused by human activities on land but also from the movement of water in the marine environment.  Mikroplastik adalah partikel plastik kecil yang memiliki karakteristik mudah terakumulasi pada air laut laut dan sedimen dengan ukuran diameter kurang dari 5 mm. Keberadaan mikroplastik pada air laut laut dan sedimen dapat memberikan dampak berantai terhadap ekosistem perair lautan dan manusia. Tujuan dari penelitian ini adalah untuk mengetahui karakteristik mikroplastik pada sedimen dan air laut di Muara Sungai Wulan, Demak. Sampel sedimen dan air laut diambil dengan purpossive sampling di lima stasiun yang berbeda segaris dengan muara sungai pada tanggal 20 Mei 2021. Identifikasi dan penghitungan mikroplastik secara visual menggunakan mikroskop, dan uji FTIR (Fourier transform infrared). Kelimpahan mikroplastik tertinggi ditemukan pada sedimen Stasiun 2 (400 partikel.Kg-1) dan air laut Stasiun 1 (99 partikel.L-1) yang merupakan akhir dari aliran sungai Wulan. Keragaman karakteristik mikroplastik yang berupa fragment, fiber, pellet dan film, partikel fragmen terbanyak di sample sedimen dan air laut. Warna partikel mikroplastik didominasi hitam dan biru, dengan warna coklat, putih, merah, hijau, kuning dan ungu yang lebih sedikit.  Rentang ukuran partikel mikroplastik yang ditemukan antara 1,00-259,06 µm. Polutan mikroplastik berjenis plastik nitrile, nylon dan PTFE (Polytetrafluoroethylene). Hasil penelitian ini mengungkapkan sumber polusi antropogenik di daerah penelitian yang tidak hanya disebabkan oleh aktivitas manusia di darat tetapi juga dari perge","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47344599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Perubahan Luas Terumbu Karang di Pulau Panjang, Jepara","authors":"S. Suryono, A. Ambariyanto, M. Munasik, R. Ario, Ibnu Pratikto, Nur Taufiq-Spj, Syahrial Varrel Canavaro, Tiara Anggita, Prayogi Prayogi, Eny Supryhatun","doi":"10.14710/jkt.v25i3.10249","DOIUrl":"https://doi.org/10.14710/jkt.v25i3.10249","url":null,"abstract":"The coral reefs of Panjang Island, Jepara have been under pressure both by natural factors and by human (anthropogenic) activities, which have resulted in the degradation coral reef area. Research on changes in coral reefs is needed, but the constraints are time, cost, and labor. Remote sensing interpretation of satellite image data is an alternative to determine changes in the area of coral reefs. The use of multitemporal image data can be applied to analyze changes that occur, in this study using four Landsat image data with the acquisition of 2001,2005, 2010, and 2019. The purpose of this study was to determine changes in the area of coral reefs in Panjang Island for the period 2001-2019.  The research material used is Landsat 7 and Landsat 8 imagery. The research method is a survey method with a multispectral classification of the maximum possibilities for extracting coral reef cover data from multitemporal images that have been corrected geometrically and radiometrically. A field survey (ground check) was conducted to determine the percentage mapping accuracy. Data on coral reef cover were overlaid to obtain the results of changes in the area of coral reefs for the period 2001-2019. The results showed that the coral reefs in Panjang Island had undergone extensive changes, namely: The area of living coral reefs decreased to 64,34%, with a change rate of 0.17 HaYear-1from 2001-2019. In 2001, the distribution of live coral reefs was seen on the northeast, east, south, and west sides of Panjang Island then reduced coral reefs area, finally left on the northeast and south sides of the island in 2019.  Terumbu karang di Pulau Panjang ,Jepara telah mengalami tekanan baik oleh peristiwa alam maupun oleh aktivitas manusia (antropogenik), yang menyebabkan terjadinya  degradasi luasan  areal. Penelitian tentang perubahan luas  terumbu karang sangat  diperlukan, namun kendaalanya adalah  waktu lama, biaya serta tenaga yang banyak. Penginderaan jauh interpretasi data citra satelit adalah salah satu alternatif guna mengetahui perubahan luas terumbu karang.Pemanfaatan data citra multitemporal dapat diterapkan untuk menganalisis perubahan yang terjadi, dalam penelitian ini menggunakan empat  data citra landsat dengan akuisisi tahun 2001,2005, 2010 dan 2019. Tujuan penelitian ini adalah untuk mengetahui perubahan luas terumbu karang di perairan Pulau Panjang perode tahun 2001-2019. Materi  Penelitian yang dipergunakan adalah citra Landsat 7 dan Landsat  8.Metode penelitian adalah metode survei dengan  klasifikasi multispektral dari kemungkinan maksimum untuk ekstraksi data tutupan terumbu karang dari citra multitemporal yang telah dikoreksi secara geometris dan radiometrik.survei lapangan (ground check) dilakukan  untuk mengetahui persentase akurasi pemetaan. Data luas tutupan terumbu karang dioverlay guna mendapatkan hasil perubahaan luas terumbu karang periode tahun 2001-2019. Hasil penelitian menunjukan bahwa Terumbu karang di Pulau Panjang telah mengalam","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41452373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Antioxidant Activity and Bioactive Compounds of Tropical Brown Algae Padina sp. from Bintan Island, Indonesia","authors":"J. R. Hidayati, M. Bahry, I. Karlina, E. Yudiati","doi":"10.14710/jkt.v25i3.15562","DOIUrl":"https://doi.org/10.14710/jkt.v25i3.15562","url":null,"abstract":"Macroalgae is one of the marine resources that have the ability as an antioxidant. Its ability is obtained from bioactive compounds produced through secondary metabolism. One type of macroalgae that has the potential as an antioxidant is Padina sp. This study aims to analyze the content of bioactive compounds in Padina sp and determine their antioxidant activity using DPPH as free radicals. Padina sp. was taken from the Bintan waters and shade-dried for three days. Bioactive compounds were analyzed through phytochemical screening to determine the content of flavonoid compounds, steroids, triterpenoids, saponins, and tannins. Determination of antioxidant activity begins with measuring the maximum wavelength of DPPH at 400-800 nm and determining the incubation time of the sample and DPPH. Antioxidant activity was determined based on the value of Inhibition concentration (IC50) at a wavelength of 515.5 nm; total phenolic content was determined using gallic acid standard (725 nm); total flavonoid content was determined using quercetin standard (415 nm), chlorophyll a and carotenoids were selected to determine pigment content on the sample. The results showed that Padina sp. contains flavonoid compounds, steroids, and tannins. Extract of Padina sp. has a total phenolic content of 46.02 mg/GAE g; total flavonoid content of 35.36 mg/QE g; chlorophyll content of 9.18 mg/g; and carotenoid content of 26.46 µmol/g. Methanol extract of Padina sp. has an IC50 value of 92.17 ppm and is classified as a strong antioxidant.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43416108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aktivitas Antijamur dari Bakteri Sedimen Mangrove Terhadap Candida albicans dan Malassezia furfur","authors":"Ananda Arifidyani, A. Susanto, W. A. Setyati","doi":"10.14710/jkt.v25i3.15114","DOIUrl":"https://doi.org/10.14710/jkt.v25i3.15114","url":null,"abstract":"Candida albicans and Malassezia furfur are fungal pathogens that can cause skin infections. This disease can be easily transmitted from one individual to another. The use of antibiotic drugs can cause pathogenic fungi to become resistant. Therefore, there is a need for the development of new antifungal substances, one of which comes from mangrove sediment bacteria. This research was conducted with the aim of obtaining bacterial isolats from mangrove sediments that have the ability to fight the fungal pathogens Candida albicans and Malassezia furfur. The method in this research is descriptive exploratory laboratory which includes isolation sampling and isolat purification, morphological characterization, screening, antifungal activity test and biochemical test. The results of this study were obtained 3 bacterial isolats that have antifungal activity against the fungal pathogens Candida albicans and Malassezia furfur. The results of the identification of biochemical tests showed that the isolat S.ISP2 was identified as the genus Pseudomonas; isolat S.ISP4 identified as Genus Moraxella; and isolat KJ.MA1 identified as Genus Vibrio  Candida albicans dan Malassezia furfur merupakan patogen jamur yang dapat menyebabkan penyakit infeksi kulit. Penyakit ini dapat dengan mudah ditularkan dari satu individu ke individu lainnya. Penggunaan obat antibiotik dapat mengakibatkan jamur patogen menjadi resisten. Oleh karena itum eprlunya ada pengembangan zat antijamur baru yang salah satunya berasal dari bakteri sedimen mangrove. Penelitian ini dilakukan dengan tujuan untuk mendapatkan bakteri isolat dari sedimen mangrove yang memiliki kemampuan untuk melawan jamur patogen Candida albicans dan Malassezia furfur. Metode pada penelitian ini adalah deskriptif eksploratif laboratory yang meliputi sampling isolasi dan purifikasi isolat, karakterisasi morfologi, skrining, uji aktivitas antijamur dan uji biokimia. Hasil dari penelitian ini adalah didapatkan 3 bakteri isolat yang memiliki aktivitas antijamur terhadap jamur patogen Candida albicans dan Malassezia furfur. Hasil identifikasi uji biokimia menunjukkan bahwa isolat S.ISP2 teridentifikasi sebagai Genus Pseudomonas; isolat S.ISP4 teridentifikasi sebagai Genus Moraxella; dan isolat KJ.MA1 teridentifikasi sebagai Genus Vibrio. ","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43053775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Kandungan Senyawa Bioaktif dan Aktivitas Biologis Ekstrak Daun Rhizophora apiculata Asal Perairan Teluk Awur, Jepara","authors":"Mirsa Septiana Mutik, Mada Triandala Sibero, Widianingsih Widianingsih, S. Subagiyo, Rudhi Pribadi, Dwi Haryanti, A. Ambariyanto, R. Murwani","doi":"10.14710/jkt.v25i3.14287","DOIUrl":"https://doi.org/10.14710/jkt.v25i3.14287","url":null,"abstract":"Rhizophora apiculata is a type of mangrove that has the ability to adapt to extreme environmental conditions such as temperature, low oxygen levels, and high salinity. This adaptability affects the production of secondary metabolites. Information about the antibacterial activity of this mangrove against MDR (Multi-Drug Resistant) bacteria is still very limited. The content of secondary metabolites produced by mangrove R. apiculata is also expected to affect antioxidant activity against free radicals. The purposes of this study were to examine the presence of bioactive compounds by phytochemical tests and to evaluate the antibacterial activity against MDR bacteria such as Pseudomonas aeruginosa, Escherichia coli, Bacillus cereus, and Bacillus subtilis; and antioxidants property of R. Apiculata leaves that were collected from Teluk Awur, Jepara. The leaves were extracted using the multilevel maceration method with solvent sequence n-hexane, ethyl acetate and methanol. Metabolite finger printing using TLC method was carried out to detect the presence of alkaloids, flavonoids, saponins, phenolics, quinones, steroids, and triterpenoids. The antibacterial test was carried out using agar well diffusion method while the antioxidant test was carried out using the DPPH method. The results of the phytochemical test showed that there were groups of alkaloids and steroids in the n-hexane solvent; alkaloids, phenolics, and steroids in ethyl acetate solvent; as well as alkaloids, flavonoids, phenolics, and saponins in methanol solvents. The results of this study indicate that R. apiculata from Teluk Awur Coastal Waters, Jepara had no potential as an antibacterial against MDR (Multi-Drug Resistant) bacteria, however the methanol extract has the potential to be used as an antioxidant with an IC50 value of 85.999 ppm. The bioautography showed that compounds from the phenol group, flavonoids, triterpenoids and b-carotene pigments acted as antioxidant agents in the leaf extract of R. apiculata.   Rhizophora apiculata merupakan salah satu jenis mangrove yang memiliki kemampuan beradaptasi terhadap kondisi lingkungan ekstrem seperti suhu, kadar oksigen rendah dan salinitas tinggi. Kemampuan beradaptasi tersebut mempengaruhi produksi matabolit sekunder. Informasi mengenai kemampuan aktivitas antibakteri mangrove jenis ini melawan bakteri MDR (Multi Drug Resistent) masih sangat terbatas. Kandungan metabolit sekunder yang dihasilkan mangrove R. apiculata ini juga diharapkan dapat mempengaruhi aktivitas antioksidan melawan radikal bebas. Tujuan dari penelitian ini adalah untuk mengkaji kandungan senyawa bioaktif serta aktivitas biologis berupa antibakteri melawan bakteri MDR Pseudomonas aeruginosa, Escherichia coli, Bacillus cereus dan Bacillus subtilis; dan antioksidan dari ekstrak daun mangrove R. apiculata asal perairan Teluk Awur, Jepara. Sampel diekstraksi menggunakan 3 pelarut berbeda (n-heksana, etil asetat dan metanol) dengan metode maserasi bertingkat. Analisis m","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41831287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mikrofragmentasi Untuk Restorasi Karang Masif di Pulau Sambangan Karimunjawa","authors":"Dwi Haryanti, Ali Maskur, Munasik Munasik","doi":"10.14710/jkt.v25i3.15124","DOIUrl":"https://doi.org/10.14710/jkt.v25i3.15124","url":null,"abstract":"Coral reefs in Indonesia has been degraded due to various environmental stressors and only a few are left under very good category. Coral reef restoration efforts need to be planned to improve the condition of damaged coral reef ecosystems. Microfragmentation is one of the methods used for massive coral reef restoration. This research aims to determine the growth rate and survival rate of Porites and Cyphastrea using different fragment sizes. The coral fragments were used 1 cm2, 2 cm2, and 4 cm2. This research was conducted in a maintenance tank owned by PT Pura Baruna Bahari located on Sambangan Island from September to December 2021. Observation of growth rate and survival rate were checked every one week by taking photos of coral fragments. These photos were processed using Image J. The results show that the highest growth rate of Porites was found in fragments 2 cm2 (0.272 cm2/week) and the lowest was obtained from fragments 4 cm2 (0.092 cm2/week). The highest growth rate of Cyphastrea was found in fragments 2 cm2 with the growth rate of 0.736 cm2/week and the lowest was obtained from fragments 4 cm2 with the growth rate of 0.447 cm2/week. The survival rates of coral fragments Porites and Cyphastrea were 100% and 98.21%, respectively. The results of growth rate analysis using One Way ANOVA showed that there was a significant difference (P<0.05) on Porites growth rate and no significant difference (P>0.05) were found on Cyphastrea’s growth rate. The highest growth rate was achieved at 2 cm2 fragments of Porites and Cyphastrea fragments.  Kondisi ekosistem terumbu karang di Indonesia telah mengalami degradasi akibat berbagai tekanan lingkungan, dan hanya sedikit yang berada dalam katagori sangat baik. Restorasi terumbu karang perlu dilakukan untuk memperbaiki kondisi ekosistem terumbu karang yang telah rusak. Mikrofragmentasi merupakan salah satu metode yang digunakan untuk usaha restorasi terumbu karang masif. Penelitian ini bertujuan untuk mengetahui laju pertumbuhan dan kelulushidupan karang Porites dan Cyphastrea menggunakan ukuran fragmen yang berbeda. Fragmen karang yang digunakan berukuran 1 cm2, 2 cm2, dan 4 cm2. Penelitian ini dilakukan di bak pemeliharaan milik PT Pura Baruna Bahari yang terletak di Pulau Sambangan pada bulan September – Desember tahun 2021. Pengamatan laju pertumbuhan dan kelulushidupan dilakukan setiap 1 minggu dengan cara pengambilan foto fragmen karang. Pengolahan data laju pertumbuhan dilakukan menggunakan perangkat lunak Image J. Hasil penelitian ini berupa laju pertumbuhan dan kelulushidupan setiap fragmen karang Porites dan Cyphastrea. Laju pertumbuhan Porites tertinggi didapatkan pada fragmen yang berukuran 2 cm2 dengan nilai 0,272 cm2/minggu dan terendah didapatkan dari fragmen yang berukuran 4 cm2 dengan nilai 0,092 cm2/minggu. Laju pertumbuhan Cyphastrea tertinggi didapatkan pada fragmen yang berukuran 2 cm2 dengan nilai 0,736 cm2/minggu dan terrendah didapatkan dari fragmen yang berukuran 4 cm2 dengan nil","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46095577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dinamika Perubahan Luasan dan Kerapatan Ekosistem Mangrove Di Kawasan Taman Nasional Sembilang Menggunakan Citra Satelit Landsat 8","authors":"Sigit Febrianto, Hanan Azzahra Syafina, Nurul Latifah, Pratono Puroso","doi":"10.14710/jkt.v25i3.14909","DOIUrl":"https://doi.org/10.14710/jkt.v25i3.14909","url":null,"abstract":"The Mangrove Ecosystem is the most extensive forest in the Sembilang National Park (TNS) area. This area is located on the east coast of South Sumatra Province. The Sembilang National Park area has a natural mangrove forest of 88,555 ha. This area is known as the largest natural mangrove forest on the island of Sumatra. The purpose of this study was to determine changes in the area and density of mangroves in a period of 5 years using Landsat 8 satellite imagery. The results of the analysis show that the mangrove area in 2014 was 92,731 ha and the mangrove area in 2019 was 88,586 ha, the area decreased by 4,145 ha or about 4.5%. The main factors influencing changes in mangrove area and density are human activities such as land clearing near mangrove forest areas. In addition, there are natural factors that are dominantly influenced by abrasion and river sedimentation.   Ekosistem Mangrove merupakan hutan paling luas yang terdapat di kawasan Taman Nasional Sembilang (TNS). Kawasan ini terletak di pesisir timur Provinsi Sumatera Selatan. Kawasan TN Sembilang memiliki hutan mangrove alami seluas 88.555 ha. Kawasan ini dikenal sebagai hutan mangrove alami terluas di Pulau Sumatera. Tujuan penelitian ini adalah untuk mengetahui perubahan luasan dan kerapatan mangrove dalam kurun waktu 5 tahun menggunakan citra satelit Landsat 8. Teknik analisis spasial yang digunakan untuk mengkelaskan mangrove dan non mangrove serta kerapatan dengan menggunakan Supervised Classification dan NDVI. Hasil analisa menunjukkan bahwa luasan mangrove pada tahun 2014 seluas 92.731 ha dan luasan mangrove tahun 2019 seluas 88.586 ha, luasan mengalami penurunan sebesar 4.145 ha atau sekitar 4,5%. Faktor-faktor yang mempengaruhi perubahan luas dan kerapatan mangrove yang utama adalah aktivitas manusia seperti pembukaan lahan di dekat area hutan mangrove. Selain itu, terdapat faktor alam mempunyai yang dominan dipengaruhi oleh abrasi dan sedimentasi sungai.","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48627277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gastropoda Laut dan Chiton di Mikrohabitat Bangunan Pelindung Pantai Pelabuhan Krueng Geukueh Provinsi Aceh","authors":"C. M. 'Akla, F. Hadinata, Nurfirli Ikhsan, Welmar Olfan Basten Barat, Hendrik V. Ayhuan, Muhammad Hatta, Riri Ezraneti, S. Syahrial","doi":"10.14710/jkt.v25i3.14950","DOIUrl":"https://doi.org/10.14710/jkt.v25i3.14950","url":null,"abstract":"The study was carried out in March 2022 at 8 observation stations in the Krueng Geukueh Harbor coastal protection facility in Aceh Province, using the visual encounter method for 120 minutes. The Shannon-Weaver diversity index, Simpson dominance, and Shannon-Weaver uniformity were used to generate the gastropod ecology index, while PCA was used to examine dominance by specific species and CA was used to analyze similarities in species composition. The study's findings included 20 species, 7 families, and a group of chitons. Gastropods Littorina angulifera, Echinolittorina puncatata, Nerita chamaeleon, Mauritia arabica, Thais mancinella, Morula musiva and Herba corticata are classified as rare (relative frequency < 20%); Littorina undulata, Nerita planospira, Cypraea mauritiana and Chiton sp. classified as occasional (relative frequency 21 – 40%); Littorina brevicula and Echinolittorina placida are relatively common (relative frequency 41 – 60%); Nerita albicilla, Nerita costata, Tylothais virgata and Tenguella granulata are relatively common (relative frequency 61 – 80%); and Thais (Thalesa) aculeata, Trochus radiatus and Cellana radiata were found to be relatively abundant (relative frequency > 80%). The gastropod diversity and uniformity indices were both low (1.49 and 0.48, respectively), where as the dominance index was moderate (0.52). The PCA analysis revealed that the dominant gastropod species were C. mauritiana, M. arabica, and M. musiva, and the CA analysis revealed the establishment of three groups based on the species composition discovered as a result of human activities near the study site.  Kajian dilakukan pada bulan Maret 2022 di 8 stasiun pengamatan pada bangunan pelindung pantai Pelabuhan Krueng Geukueh Provinsi Aceh menggunakan metode visual encounter selama 120 menit. Indeks ekologi gastropoda dihitung dengan indeks keanekaragaman Shannon-Weaver, dominansi Simpson dan keseragaman Shannon-Weaver, sedangkan dominansi oleh spesies tertentu dianalisis menggunakan PCA dan kesamaan komposisi spesiesnya dianalisis menggunakan CA. Hasil kajian mendapatkan 20 spesies dan 7 famili serta ditemukan juga kelompok chiton. Gastropoda Littorina angulifera, Echinolittorina puncatata, Nerita chamaeleon, Mauritia arabica, Thais mancinella, Morula musiva dan Herba corticata tergolong langka ditemukan (frekuensi relatif < 20%); Littorina undulata, Nerita planospira, Cypraea mauritiana dan Chiton sp. tergolong sesekali ditemukan (frekuensi relatif 21–40%); Littorina brevicula dan Echinolittorina placida tergolong sering ditemukan (frekuensi relatif 41–60%); Nerita albicilla, Nerita costata, Tylothais virgata dan Tenguella granulata tergolong umum ditemukan (frekuensi relatif 61–80%); serta Thais (Thalessa) aculeata, Trochus radiatus dan Cellana radiata tergolong melimpah ditemukan (frekuensi relatif >80%). Indeks keanekaragaman dan keseragaman gastropodanya tergolong rendah (1.49 dan 0.48), sedangkan indeks dominansinya tergolong sedang (0.52). Da","PeriodicalId":53001,"journal":{"name":"Jurnal Kelautan Tropis","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41391938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}