Subjects -> EARTH SCIENCES (Total: 771 journals)
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OCEANOGRAPHY (88 journals)

Showing 1 - 77 of 77 Journals sorted by number of followers
Deep Sea Research Part II: Topical Studies in Oceanography     Hybrid Journal   (Followers: 29)
Deep Sea Research Part I : Oceanographic Research Papers     Hybrid Journal   (Followers: 23)
Estuaries and Coasts     Hybrid Journal   (Followers: 23)
Limnology and Oceanography     Hybrid Journal   (Followers: 22)
Progress in Oceanography     Hybrid Journal   (Followers: 21)
Journal of Marine Biology & Oceanography     Hybrid Journal   (Followers: 19)
New Zealand Journal of Marine and Freshwater Research     Hybrid Journal   (Followers: 18)
Journal of Physical Oceanography     Hybrid Journal   (Followers: 18)
Frontiers in Marine Science     Open Access   (Followers: 17)
Journal of Marine Sciences     Open Access   (Followers: 17)
Coastal Engineering     Hybrid Journal   (Followers: 15)
Advances in Oceanography and Limnology     Open Access   (Followers: 15)
Journal of Oceanography     Hybrid Journal   (Followers: 14)
Maritime Studies     Open Access   (Followers: 13)
International Journal of Oceanography     Open Access   (Followers: 12)
Advances in Statistical Climatology, Meteorology and Oceanography     Open Access   (Followers: 11)
Atmospheric and Oceanic Science Letters     Open Access   (Followers: 10)
Bulletin of Marine Science     Full-text available via subscription   (Followers: 9)
Fisheries Oceanography     Hybrid Journal   (Followers: 8)
Journal of Oceanography and Marine Science     Open Access   (Followers: 7)
Open Journal of Marine Science     Open Access   (Followers: 6)
Limnology and Oceanography: Methods     Hybrid Journal   (Followers: 6)
Journal of Operational Oceanography     Hybrid Journal   (Followers: 6)
Physical Oceanography     Hybrid Journal   (Followers: 6)
Paleoceanography and Paleoclimatology     Full-text available via subscription   (Followers: 5)
Marine Science     Open Access   (Followers: 5)
Limnology and Oceanography: Fluids and Environments     Full-text available via subscription   (Followers: 5)
Ocean Yearbook Online     Hybrid Journal   (Followers: 4)
Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 4)
Limnology and Oceanography Letters     Open Access   (Followers: 4)
Journal of Marine Science and Engineering     Open Access   (Followers: 4)
African Journal of Marine Science     Hybrid Journal   (Followers: 4)
Oceanology     Hybrid Journal   (Followers: 3)
Journal of Aquatic Sciences     Full-text available via subscription   (Followers: 3)
Limnology and Oceanography e-Lectures     Open Access   (Followers: 3)
Journal of Coastal Development     Open Access   (Followers: 3)
Ciencias Marinas     Open Access   (Followers: 3)
Journal of Marine Science and Application     Hybrid Journal   (Followers: 3)
Journal of Ocean Engineering and Marine Energy     Hybrid Journal   (Followers: 3)
Tropical Oceanography     Open Access   (Followers: 2)
Indian Journal of Geo-Marine Sciences     Open Access   (Followers: 2)
Mediterranean Marine Science     Open Access   (Followers: 2)
Regional Studies in Marine Science     Hybrid Journal   (Followers: 2)
Annals of Marine Science     Open Access   (Followers: 2)
Limnology and Oceanography: Bulletin     Hybrid Journal   (Followers: 2)
Annals of Limnology and Oceanography     Open Access   (Followers: 2)
Development and Applications of Oceanic Engineering     Open Access   (Followers: 2)
Journal of Ocean Engineering and Technology     Open Access   (Followers: 1)
Ocean Life     Open Access   (Followers: 1)
Marine Systems & Ocean Technology     Hybrid Journal   (Followers: 1)
Journal of Ocean University of China (English Edition)     Hybrid Journal   (Followers: 1)
Marine Life Science & Technology     Hybrid Journal   (Followers: 1)
Journal of Ocean Engineering and Science     Open Access   (Followers: 1)
Coastal Engineering Proceedings : Proceedings of the International Conference on Coastal Engineering     Open Access   (Followers: 1)
Marine Technology Society Journal     Full-text available via subscription   (Followers: 1)
Scientia Marina     Open Access   (Followers: 1)
Western Indian Ocean Journal of Marine Science     Open Access   (Followers: 1)
Asian Journal of Fisheries and Aquatic Research     Open Access  
Thalassas : An International Journal of Marine Sciences     Hybrid Journal  
Oceans     Open Access  
Aquatic Research     Open Access  
Jurnal Kelautan Tropis     Open Access  
Acta Aquatica : Aquatic Sciences Journal     Open Access  
Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan     Open Access  
Journal of Agricultural and Marine Sciences     Open Access  
Turkish Journal of Maritime and Marine Sciences     Open Access  
Arquivos de Ciências do Mar     Open Access  
Scientific Drilling     Open Access  
Jurnal Kelautan : Indonesian Journal of Marine Science and Technology     Open Access  
Oceanologia     Open Access  
Revista de Gestão Costeira Integrada     Open Access  
Revista Ciencias Marinas y Costeras     Open Access  
Egyptian Journal of Aquatic Research     Open Access  
China Ocean Engineering     Hybrid Journal  
Revista de Biología Marina y Oceanografía     Open Access  
Latin American Journal of Aquatic Research     Open Access  
Acta Oceanologica Sinica     Hybrid Journal  
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Jurnal Kelautan Tropis
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1410-8852 - ISSN (Online) 2528-3111
Published by Diponegoro University Homepage  [16 journals]
  • Karakteristik Arus Laut Permukaan dari High Frequency Radar pada Musim
           Timur di Selat Bali

    • Authors: Shafira Tsanyfadhila, Aris Ismanto, Muhammad Helmi
      Pages: 279 - 290
      Abstract: Bali Strait has many activities in port and water, such as passenger and freight transportation, tourism, and fisheries. Oceanographic conditions, especially sea surface current (SSC), affect the smoothness of ports and shipping activities in the Bali Strait. High-Frequency Radar (HF Radar) has the advantage of monitoring and mapping surface currents and ocean waves with high resolution. Because of the narrow strait area, HF Radar is very beneficial in describing the characteristics of SSC in the Bali Strait. Therefore, HF Radar data is used to describe the dynamics of SSC in the Bali strait, especially in ship crossing lane, with a temporal approach during Southeast Monsoon, June to August 2020. This study was conducted for 15 days each month which included neap tide and spring tide. Surface current charts are created to analyze the pattern of temporal SSC against the wind, tides, and their components. The results showed In the southeast monsoon, the average current speed at the research site ranged from 0.1 – 1.08 m/s. The direction of the surface current is predominantly towards the south. The characteristics of surface currents in the Bali Strait are influenced by tides, sea level anomalies, and coastal morphology. Temporally, the speed of the current is greater during the ebb phase and when the spring tide. Spatially, the central region of the Bali Strait waters has a greater current speed. Knowledge of areas and times with higher current speeds can be the basis for determining the shipping lane between ports in the Bali Strait.  Selat Bali memiliki banyak kegiatan di pelabuhan dan perairan, seperti transportasi penumpang dan barang, pariwisata, serta perikanan. Kondisi oseanografi, khususnya arus permukaan laut, mempengaruhi kelancaran pelabuhan dan aktivitas pelayaran di Selat Bali. High-Frequency Radar (HF Radar) memiliki keunggulan pemantauan dan pemetaan arus permukaan dan gelombang laut dengan resolusi tinggi. Karena wilayah selat yang sempit, HF Radar sangat bermanfaat dalam menggambarkan karakteristik arus permukaan laut di Selat Bali. Oleh karena itu, data HF Radar digunakan untuk menggambarkan dinamika arus permukaan laut di jalur penyeberangan Selat Bali dengan pendekatan temporal pada musim timur, bulan Juni hingga Agustus 2020. Penelitian ini dilakukan selama 15 hari tiap bulan yang mencakup waktu pasang purnama dan pasang perbani. Grafik arus permukaan dibuat untuk menganalisis pola arus permukaan laut secara temporal ketika musim timur terhadap angin, pasang surut dan komponennya. Hasil menunjukkan pada musim timur, rata – rata kecepatan arus di lokasi penelitian berkisar antara 0.1 – 1.08 m/s. Arah arus permukaan dominan ke arah selatan. Karakteristik arus permukaan di Selat Bali di pengaruhi oleh pasang surut, sea level anomaly dan morfologi pantai. Secara temporal, kecepatan arus lebih besar ketika menuju surut dan ketika pasang purnama. Secara spasial, wilayah tengah perairan Selat Bali memiliki kecepatan arus yang lebih besar. Pengetahuan mengenai wilayah perairan dan waktu – waktu dengan kecepatan arus yang tinggi dapat menjadi dasar dalam penentuan alur pelayaran antar pelabuhan di Selat Bali.
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.13978
      Issue No: Vol. 25, No. 3 (2022)
       
  • Molecular Identification of Brown Algae Sargassum sp. from the Lombok
           Coastal Waters

    • Authors: Yeni Sulistiyani, Norma Afiati, Haeruddin Haeruddin, Agus Sabdono
      Pages: 291 - 298
      Abstract: Sargassum is a well-known genus of brown algae in Indonesia that has long been investigated due to its economic importance. To support its biological research, it is important to identify and classify the species studied. Morphological identification had greatly contributed to taxonomy, however, it cannot distinguish Sargassum species accurately due to its plasticity. The current study aims to identify Lombok Sargassum molecularly using an ITS2 DNA barcode. Fresh algae were collected from Ekas Bay (EB) and Aan Cape (AC) in Lombok. DNA was first purified, and then its gene product was amplified using ITS2 primers. DNA sequences were examined and traced using the Basic Local Alignment Search Tool (BLAST). DNA sequences were processed in MEGA-X to reconstruct the phylogenetic tree and estimate the genetic distance. Three species were identified based on the BLAST results: Sargassum cf granuliferum, Sargassum polycystum, and Sargassum oligocystum. The base length obtained ranged from 521 to 637 bp, with a similarity percentage of 99.25 to 100%. The phylogenetic tree exhibited each recognized Sargassum species was clustered with the same species from the gene bank. Interspecies genetic distance was 0,000-0,0039, while amongst Sargassum species it's 0,0136-0,2395. The genetic distance between Sargassum and Ulva adherens (outgroup) was >1. Sargassum species found in Lombok were closely related to other similar species in the GenBank.
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.14760
      Issue No: Vol. 25, No. 3 (2022)
       
  • Fraksinasi Flavonoid Spirulina platensis dengan Metode Kromatografi Lapis
           Tipis dan Aktivitas Inhibisi Enzim α-Glukosidase

    • Authors: Hartoyo Notonegoro, Heder Djamaludin, Iriani Setyaningsih, Kustiariyah Tarman
      Pages: 299 - 308
      Abstract: Spirulina platensis is a type of Cyanobacterium microalgae that forms multicellular helicoidal filaments. Spirulina platensis contains primary and secondary metabolites. The type and amount of the active compound Spirulina platensis depends on the method of extraction, fractionation, and isolation. So far, there are not much research data related to the active compound of Spirulina platensis extract cultured on Walne. The purpose of this study was to use of thin layer chromatography (TLC) method to separate flavonoids from Spirulina platensis biomass extract cultured on Walne media and the activity of a-glucosidase enzyme inhibition using biomass, crude extract, active fraction of flavonoids and phycocyanins from Spirulina platensis. This research method is descriptive experimental, which the Spirulina platensis is cultured on 80 g/L NaNO3 modified Walne media, extracted by maceration, fractionated by TLC and isolated the active compound by Preparative TLC (PTLC). The analysis included fraction and isolation of flavonoids from Spirulina platensis. The results showed that the TLC could be used to identify the active compound of Spirulina platensis extract cultured on Walne. Fractionation of Spirulina platensis extract using stationary phase silica gel Si 60 GF254 and the best mobile phase with a combination of chloroform:ethyl acetate (6:4) and an Rf1 value of 0.58; Rf2 0.71; and Rf3 0.83, as well as yellow-orange spots. Isolation of the active compound of Spirulina platensis extract using PLTC stationary phase silica gel Si 60 PF254 and the best mobile phase combination eluent chloroform:ethyl acetate (9:1). RF value of Rf2 0.57; Rf3 0.86; and Rf4 0.93 with dark yellow-brown spots. The color of the spots from the PLTC results shows that the active compounds of Spirulina platensis extract are flavonoid compounds. Biomass, crude extract, phycocyanine extract and flavonoids from Spirulina do not have inhibitory activity against α-glucosidase enzyme.  Spirulina platensis merupakan jenis mikroalga Cyanobacterium yang membentuk filamen helicoidal multiseluler. Spirulina platensis mengandung senyawa metabolit primer dan sekunder. Jenis dan jumlah senyawa aktif Spirulina platensis tergantung pada metode ekstraksi, fraksinasi dan isolasi. Sejauh ini belum banyak data hasil penelitian terkait senyawa aktif ekstrak biomassa Spirulina platensis yang dikultur pada media Walne. Tujuan penelitian ini yaitu penggunaan metode kromatografi lapis tipis (KLT) untuk memisahkan flavonoid ekstrak biomassa Spirulina platensis yang dikultur pada media Walne serta aktivitas inhibisi enzim α-glukosidase menggunakan biomassa, ekstrak kasar, fraksi aktif flavonoid dan fikosianin dari Spirulina platensis. Metode penelitian ini adalah eksprimental deksriptif dimana mikroalga Spirulina platensis dikultur pada media Walne modifikasi 80 g/L NaNO3, diekstraksi dengan maserasi, difraksinasi dengan KLT dan diisolasi senyawa aktif dengan KLT Preparatif (KLTP). Analisis yang dilakukan meliputi analisis fraksi dan isolasi flavonoid dari Spirulina platensis. Hasil penelitian menunjukkan metode KLT dapat digunakan untuk mengindetifikasi senyawa aktif ekstrak Spirulina platensis yang dikultur pada media Walne. Fraksinasi ekstrak Spirulina platensis menggunakan fase diam silika gel Si 60 GF254 dan fase gerak kombinasi eluen terbaik kloroform:etil asetat (6:4) dan nilai Rf1 0,58; Rf2 0,71; dan Rf3 0,83, serta bercak berwarna kuning-oranye. Isolasi senyawa aktif ekstrak Spirulina platensis menggunakan KLTP fase diam silika gel Si 60 PF254 dan fase gerak kombinasi eluen terbaik kloroform:etil asetat (9:1). Nilai Rf2 0,57; Rf3 0,86; dan Rf4 0,93 dengan bercak berwarna kuning-cokelat gelap. Warna bercak hasil KLTP menunjukkan komponen senyawa aktif ekstrak Spirulina platensis berupa senyawa golongan flavonoid. Biomassa, ekstrak kasar, ekstrak fikosianin dan flavonoid dari Spirulina tidak memiliki aktivitas penghambatan terhadap enzim α-glukosidase.
      PubDate: 2022-10-04
      DOI: 10.14710/jkt.v25i3.13905
      Issue No: Vol. 25, No. 3 (2022)
       
  • Antioxidant Activity and Bioactive Compounds of Tropical Brown Algae
           Padina sp. from Bintan Island, Indonesia

    • Authors: Jelita Rahma Hidayati, Muhammad Syaifudien Bahry, Ita Karlina, Ervia Yudiati
      Pages: 309 - 319
      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.
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.15562
      Issue No: Vol. 25, No. 3 (2022)
       
  • Hubungan Panjang Berat dan Faktor Kondisi Siput Lola (Rochia nilotica) di
           Perairan Maluku, Sumbawa, dan Bengkulu

    • Authors: Risnita Tri Utami, Putri Sapira Ibrahim, Agus Kusnadi, Dedy Kurnianto, Teddy Triandiza, Rosmi N Pesillette
      Pages: 320 - 328
      Abstract: Rochia nilotica (Tegulidae) is a snail that is highly important economically due to its nacre layer on their shells. Lola shells are used as raw material in nail polish and high quality pearl buttons. Recently, the production of Rochia nilotica has drastically decreased. This study aimed to investigate the relationship on length-weight and condition factors of Rochia snails from four sites. Data collection was gathered on may-September 2021 at four sites i.e Kei Island, Morellla (Central Maluku), Sumbawa Island and Enggano Island with purposive sampling method. A total 177 individuals have been collected with a detail of 35 individuals from Kei Island, 61 Individuals from Central Maluku, 51 and 29 individuals from Sumbawa Island and Enggano island respectively.  The result showed that the relationship on length-weight of Rochia snails at Enggano Island, Sumbawa Island, central Maluku and Kei Island was  W=0,00707L2,2804, 0,00686L2,3949, 0,00308L2,5478,dan 0,00025L3,0893 respectively. The result shows that the growth pattern at Bengkulu, Sumbawa, and Morella follows a negative allometric model, while those at Kei Islands follow a positive allometric. Condition factors were relatively varied 1,0020-1,0317 suggested that the research waters were still a suitable environment for the growth of top shells.   Siput lola Rochia nilotica (Tegulidae) merupakan komoditi niaga bernilai ekonomis tinggi karena cangkangnya yang memiliki lapisan mutiara. Cangkang siput lola digunakan sebagai bahan baku industri cat kuku dan kancing yang berkualitas tinggi. Akibat eksploitasi berlebihan, produksi siput lola mengalami penurunan drastis selama beberapa tahun terakhir. Penelitian ini bertujuan untuk menentukan hubungan panjang berat dan faktor kondisi dari siput lola di 4 lokasi penelitian yang dipilih. Pengambilan data dilakukan pada bulan April-September 2021 dengan menggunakan metode Purposive Sampling yang dilakukan di 4 lokasi yaitu Kepulauan Kei, Morella, Pulau Sumbawa, dan Pulau Enggano yang mewakili 3 wilayah (Timur, Tengah dan Barat) Perairan Indonesia. Siput Lola yang diperoleh sebanyak 177 individu yang berasal dari 35 individu dari Kepulauan Kei, 61 individu Morella, 51 individu Sumbawa, dan 29 individu Enggano. Hubungan panjang berat siput lola di lokasi penelitian Enggano, Sumbawa, Morella, dan Kepulauan Kei secara berurutan yaitu sebesar W=0,00707L2,2804, 0,00686L2,3949, 0,00308L2,5478,dan 0,00025L3,0893. Hasil penelitian ini menunjukkan bahwa pola pertumbuhan siput lola di Pulau Enggano, Sumbawa dan Morella mengikuti model allometrik negatif, sedangkan pola pertumbuhan siput lola di Kepulauan Kei mengikuti model allometrik positif. Faktor kondisi relatif beragam dari 1,0020-1,0317 yang mengindikasikan bahwa daerah perairan penelitian masih merupakan lingkungan yang sesuai untuk pertumbuhan siput lola.
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.14089
      Issue No: Vol. 25, No. 3 (2022)
       
  • Identifikasi Mikroplastik pada Sedimen Pantai Sukaraja, Lampung

    • Authors: Rina Budi Satiyarti, Suci Wulan Pawhestri, Innas Salwa Adila
      Pages: 329 - 336
      Abstract: Microplastics are small part of degraded plastic waste which it size is under 5 mm. Microplastic could be found in water, soil, and air. A large amount of microplastics could harm the environment, especially aquatic ecosystem and water drainage. The aims of this study means to determine the characteristics and amount of microplastics in sediment from Sukaraja Beach, Bandar Lampung City. This research is ecology based study by using a quantitative descriptive approach. Sampling method was done using purposive sampling method at 3 locations. Observation result showed the colors of the microplastics are transparent white, blue, black, red and brown. The size of the microplastic particles were >250 µm. The amount of microplastics found in the sediment were 42 particles with  15 fibers, 6 films , 15 fragments, and 6 pelets. The total abundance of each station was 93.34 particles/kg at station I; 93.34 particles/kg at station II; and 93.34 particles/kg at station III. The DO results at station 1 were 3.61 mg/l at low tide and 5.79 at high tide, station II are 3.32 mg/l at high tide and 7.03 mg/l at low tide, and  station III, the DO results at high tide were 3.41 mg/l and 5.21 at low tide.   Mikroplastik adalah potongan dari limbah plastik yang terdegradasi dan memiliki ukuran kurang dari 5 mm, dapat dijumpai pada air, tanah, maupun udara. Penelitian ini bertujuan untuk mengetahui karakteristik dan jumlah kelimpahan mikroplastik yang ada pada sampel sedimen Pantai Sukaraja Kota Bandar Lampung. Penelitian ini berbasis ekologi dengan menggunakan pendekatan deskriptif kuantitatif. Pengambilan sampel dilakukan secara random pada 3 titik lokasi penelitian. Warna mikroplastik yang ditemukan beragam mulai dari putih transparan, biru, hitam, merah dan coklat. Adapun ukuran dari partikel mikroplastik yang diperoleh dari penyaringan mikroplastik adalah >250 µm hal ini didasari oleh penggunaan saringan mesh yang memiliki kerapatan 250 µm. Total jumlah mikroplastik yang ditemukan pada sampel sedimen adalah 42 partikel dengan rincian 15 partikel tipe fiber, 6 partikel film, 15 partikel fragmen, dan 6 partikel pelet. Adapun total kelimpahan dari masing-masing stasiun adalah 93,34 partikel/kg pada stasiun I; 93,34 partikel/kg pada stasiun II; dan 93,34 partikel/kg pada stasiun III. Pada stasiun 1 diperoleh hasil DO yakni sebesar 3,61 mg/l pada kondisi surut dan 5,79 pada kondisi pasang. Adapun hasil yang diperoleh pada stasiun II yaitu 3,32 mg/l pada kondisi pasang dan 7,03mg/l pada kondisi surut. Pada stasiun III diperoleh hasil DO saat pasang 3,41 mg/l dan 5,21 saat surut.
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.12786
      Issue No: Vol. 25, No. 3 (2022)
       
  • Perubahan Luas Terumbu Karang di Pulau Panjang, Jepara

    • Authors: Suryono Suryono, Ambariyanto Ambariyanto, Munasik Munasik, Raden Ario, Ibnu Pratikto, Nur Taufiq-SPJ, Syahrial Varrel Canavaro, Tiara Anggita, Prayogi Prayogi, Eny Supryhatun
      Pages: 337 - 344
      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 mengalami perubahan luas yaitu 64,34% dengan laju penurunan sebesar 0,17 HaTh-1dari Tahun 2001-2019. Pada tahun 2001 sebaran terumbu karang hidup terlihat di sisi timur laut, timur, selatan dan dan barat dari Pulau Panjang, kemudian semakin mengecil areanya, hingga tersisa pada sebelah sisi timur laut dan selatan pulau saja pada tahun 2019.
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.10249
      Issue No: Vol. 25, No. 3 (2022)
       
  • Gastropoda Laut dan Chiton di Mikrohabitat Bangunan Pelindung Pantai
           Pelabuhan Krueng Geukueh Provinsi Aceh

    • Authors: Cut M. N. ‘Akla, Fitra Wira Hadinata, Nur Ikhsan, Welmar Olfan Basten Barat, Hendrik V. Ayhuan, Muhammad Hatta, Riri Ezraneti, Syahrial Syahrial
      Pages: 345 - 357
      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). Dari analisis PCA didapatkan spesies gastropoda yang mendominasi adalah C. mauritiana, M. arabica dan M. Musiva, kemudian hasil analisis CA memperlihatkan adanya pembentukan tiga kelompok berdasarkan
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.14950
      Issue No: Vol. 25, No. 3 (2022)
       
  • Pengukuran Stok Karbon Ekosistem Lamun Di Kawasan Taman Nasional Baluran,
           Jawa Timur

    • Authors: Dadan Zulkifli, Heri Triyono, Ratna Suharti, Meuthia A. Jabbar, Aditya Bramana, Siti Mira Rahayu, I Nyoman Sudiarsa, Lilyani Gita Herawati
      Pages: 358 - 368
      Abstract:  Climate change caused by various activities of human activity has produced carbon dioxide gas affecting global warming. Seagrass ecosystem has the ability to absorb and store large quantities of carbon that can reduce carbon emissions. Objectives of this study is to assess seagrass population structure, assess carbon deposits estimation and water quality parameters. The method used in this research is purposive sampling method and location determination used line Transect quadrant method which refers to LIPI method. Carbon measurements in seagrass samples used LOI method. Seagrass species found in the waters of Baluran National Park are Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, Cymodocea serrulata, Syringodium isoetifolium, Halophila minor, Halophila ovalis dan Halodule uninervis. The seagrass Enhalus acoroides has a highest biomass value and an estimate of carbon deposits 37.817 gC/m2. The total estimate of the highest carbon stock is obtained at the bottom of the substrate 40.063 ton.  Perubahan iklim yang disebabkan oleh berbagai aktifitas kegiatan manusia menghasilkan gas karbon diokasida yang berdampak pada pemanasan global. Ekosistem padang lamun memiliki kemampuan untuk menyerap dan menyimpan karbon dalam jumlah besar yang dapat mengurangi emisi karbon. Tujuan penelitian ini adalah: 1) mengkaji struktur populasi lamun, 2) mengkaji estimasi simpanan karbon, 3) mengkaji parameter kualitas air di Taman Nasional Baluran. Metode yang digunakan yaitu purposive sampling method dan penentuan lokasi menggunakan metode line transect quadrant yang mengacu pada metode LIPI. Pengukuran kualitas air dilakukan secara langsung di lapangan sesuai Standar Nasional Indonesia (SNI) dan pengukuran karbon pada sampel lamun menggunakan metode LOI. Berdasarkan hasil penelitian, diketahui bahwa Spesies lamun yang ditemukan di perairain Taman Nasional Baluran adalah Enhalus acoroides, Thalassia hemprichii, Cymodocea rotundata, Cymodocea serrulata, Syringodium isoetifolium, Halophila minor, Halophila ovalis dan Halodule uninervis. Jenis lamun Enhalus acoroides mempunyai nilai biomassa dan estimasi simpanan karbon paling tinggi yaitu 37,817 gC/m2. Estimasi total stok karbon tertinggi didapatkan pada bagian bawah substrat (rhizoma dan akar) sebesar 40,063 ton.
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.13520
      Issue No: Vol. 25, No. 3 (2022)
       
  • 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, Max Rudolf Muskananfola
      Pages: 369 - 377
      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.
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.14909
      Issue No: Vol. 25, No. 3 (2022)
       
  • Kandungan Senyawa Bioaktif dan Aktivitas Biologis Ekstrak Daun Rhizophora
           apiculata Asal Perairan Teluk Awur, Jepara

    • Authors: Mirsa Septiana Mutik, Mada Triandala Sibero, Widianingsih Widianingsih, Subagiyo Subagiyo, Rudhi Pribadi, Dwi Haryanti, Ambariyanto Ambariyanto, Retno Murwani
      Pages: 378 - 390
      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 metabolit sidik jari dilakukan menggunakan plat KLT untuk mengetahui kandungan senyawa alkaloid, flavonoid, saponin, fenolik, kuinon, steroid dan triterpenoid. Uji antibakteri dilakukan menggunakan metode sumuran sedangkan uji antioksidan dilakukan menggunakan metode DPPH. Hasil uji fitokimia menunjukkan terdapat golongan senyawa alkaloid dan steroid pada pelarut n-heksana; alkaloid, fenolik dan steroid pada pelarut etil asetat; serta alkaloid, flavonoid, fenolik dan saponin pada pelarut metanol. Hasil penelitian ini mengindikasikan bahwa R. apiculata asal perairan Teluk Awur, Jepara tidak potensial sebagai antibakteri melawan bakteri MDR (Multi Drug Resistent), akan tetapi ekstrak metanol potensial digunakan sebagai antioksidan dengan nilai IC50 85,999 ppm. Tahapan bioautografi menunjukkan bahwa senyawa dari golongan fenol, flavonoid, triterpenoid dan pigmen b-karoten berperan sebagai agen antioksidan pada ekstrak daun R. apiculata.
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.14287
      Issue No: Vol. 25, No. 3 (2022)
       
  • Biomassa dan Stok Karbon pada Ekosistem Padang Lamun di Pulau Pamegaran,
           Taman Nasional Kepulauan Seribu

    • Authors: Safira Nurlita Santoso, Ratih Ida Adharini
      Pages: 391 - 400
      Abstract: Seagrass is one of the important ecosystems in coastal areas. This study aims to determine the biomass and carbon stock in the seagrass ecosystems of the Pamegaran Island, Seribu Islands National Park, Jakarta. Data collection was conducted on December 2021 to January 2022 is done by using SeagrassWatch method and carbon data sampling results were analyzed by Kurmies method / SNI 13-4720-1998 method. Cymodocea rotundata has the highest biomass value, while Halodule uninervis has the lowest biomass value. The seagrass biomass value at the bottom of the substrate was higher than the top of the substrate in all the species found was because the rhizome contained carbohydrates and nutrients produced in the photosynthesis process and stored at the bottom of the substrate. The total value of seagrass carbon stock in the entire area is 1,932,151.36 ± 265,280.90 g C or 1.932 ± 2.652 t C with an area of 3.63 ha of seagrass beds. Thalassia hemprichii has the highest carbon stock value, while Halodule uninervis species has the lowest biomass value. The carbon stock value of the bottom of the substrate was higher than that of the top of the substrate in all species found.   Lamun adalah salah satu ekosistem penting yang ada di daerah pesisir. Penelitian ini bertujuan untuk mengetahui biomassa dan stok karbon pada ekosistem padang lamun di Pulau Pamegaran, Taman Nasional Kepulauan Seribu, Jakarta. Pengambilan data dilakukan pada bulan Desember 2021 hingga Januari 2022 menggunakan metode SeagrassWatch dan analisis data karbon menggunakan metode Kurmies / metode SNI 13-4720-1998. Cymodocea rotundata memiliki nilai biomassa yang tertinggi, sedangkan Halodule uninervis memiliki nilai biomassa terendah. Nilai biomassa lamun bagian bawah substrat lebih tinggi dari bagian atas substrat pada semua spesies yang ditemukan hal ini karena rhizome mengandung karbohidrat serta zat hara yang dihasilkan pada proses fotosintesis dan tersimpan pada bagian bawah substrat. Nilai total stok karbon lamun pada keseluruhan luas wilayah sebesar 1.932.151,36 ± 265.280,90 g C atau 1,932 ± 2,652 t C dengan luas wilayah padang lamun sebesar 3,63 Ha. Thalassia hemprichii memiliki nilai stok karbon tertinggi, sedangkan Halodule uninervis memiliki nilai biomassa terendah. Nilai stok karbon bagian bawah substrat lebih tinggi dari bagian atas substrat pada semua spesies yang ditemukan.
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.14030
      Issue No: Vol. 25, No. 3 (2022)
       
  • Pengaruh Tingkat Kerapatan dan Kedewasaan Hutan Mangrove dalam Memerangkap
           Sedimen di Muara Sungai Langsa Kota Langsa

    • Authors: Erlangga Erlangga, Helmi Gusnita, Syahrial Syahrial, Cut Meurah Nur Akla, imamshadiqin imamshadiqin, Riri Ezraneti, Rian Firdaus
      Pages: 391 - 399
      Abstract: In November 2021, a study on the effect of mangrove density and maturity level on sediment trapping in the Langsa River estuary, Langsa City, was conducted with the objective of determining the density, maturity, and rate of sediment deposition around the mangrove forest, as well as the relationship between mangrove density and maturity level and sediment deposition rate. Mangrove vegetation was collected using a 40 m line transect parallel to the river flow and a 10 x 10 m plot, while sediment samples were collected using a sediment trap. The study's findings indicated that mangrove density varied between 675.00 and 1541.67 ind/ha, that mangrove maturity was uneven, with trunk diameters ranging between 4.14 and 9.83 cm and basal areas ranging between 30.45 and 72.93 m2/ha. Meanwhile, sediment deposition rates ranged between 26.94 and 277.73 mg/cm2/day, with a strong correlation between density and maturity of mangrove vegetation (98% and 99%, respectively).   Penelitian terhadap pengaruh tingkat kerapatan dan kedewasaan hutan mangrove dalam memerangkap sedimen di muara Sungai Langsa Kota Langsa dilakukan pada bulan November 2021 dengan tujuan untuk mengetahui tingkat kerapatan, kedewasaan dan laju pengendapan sedimen di sekitar hutan mangrovenya serta untuk mengetahui keterkaitan antara tingkat kerapatan dan kedewasaan hutan mangrove terhadap laju pengendapan sedimennya. Vegetasi mangrove dikumpulkan dengan menarik transek garis sepanjang 40 m yang sejajar dengan aliran sungai dan dibuat plot berukuran 10 x 10 m, sedangkan sampel sedimennya diambil menggunakan sediment trap. Hasil penelitian memperlihatkan bahwa kerapatan mangrovenya berkisar antara 675.00 – 1541.67 ind/ha, kedewasaan mangrovenya tidak merata dengan diameter batangnya berkisar antara 4.14 – 9.83 cm dan basal areanya berkisar antara 30.45 – 72.93 m2/ha. Sementara untuk laju pengendapan sedimennya berkisar antara 26.94 – 277.73 mg/cm2/hari, dimana keterkaitan antara kerapatan dan kedewasaan vegetasi mangrovenya memiliki hubungan yang kuat (masing-masing 98% dan 99%).
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.14009
      Issue No: Vol. 25, No. 3 (2022)
       
  • Komunitas Spons (Porifera) pada Ekosistem Terumbu Karang di Manokwari,
           Indonesia

    • Authors: Nelly Sayori, Tresia S. Tururaja, Duaitd Kolibongso
      Pages: 400 - 410
      Abstract: Sponges are one of the most influential benthic organisms in coral reef ecosystems. Many studies on sponge communities have been carried out globally, from the tropics to the sub-tropics. However, in Indonesia, the sponge community has not been sufficiently observed, especially its diversity and interactions with habitats. Manokwari, a developing city north of the Bird's Head Seascape region, Papua has a lack of information on benthic communities and no reports of sponges. This study is to examine the sponge community (diversity and distribution) in coral reef ecosystem. This study found that sponge richness (species and morphology) was categorized as “low”, with only 11 species with 8 morphological forms. The most common species included Niphates erecta, Stylissa carteri, and Pseudoceratina purpurea, while the most common growth forms were massive and encrusting, accounting respectively for 27.3% and 18.2% of the total number of species. The highest diversity was found on the island of Kaki (5 species) with the island of Nusmapi having an uneven distribution of sponges. The results of our study found that there was no relationship between sponge diversity and morphology. This baseline information is essential for management of marine biodiversity hotspots in taking decisions for marine life conservation.  Spons merupakan salah satu organisme bentik yang paling berpengaruh dalam ekosistem terumbu karang. Banyak penelitian tentang komunitas spons telah dilakukan secara global, dari daerah tropis hingga sub tropis. Namun di Indonesia, komunitas spons belum cukup diamati, terutama keanekaragaman dan interaksinya dengan habitat. Manokwari, kota berkembang di utara dari wilayah Bentang Laut Kepala Burung (BLKB), Papua memiliki kekurangan informasi tentang komunitas bentik dan tidak ada laporan tentang spons. Studi ini untuk mengkaji komunitas spons (keanekaragaman dan distribusi) pada ekosistem terumbu karang. Penelitian ini menemukan kekayaan spons (spesies dan morfologi) yang dikategorikan “rendah”, dengan hanya 11 spesies dengan 8 bentuk morfologi. Spesies yang paling umum termasuk Niphates erecta, Stylissa carteri, dan Pseudoceratina purpurea, sedangkan bentuk pertumbuhan yang paling umum adalah massif dan encrusting dengan menyumbang masing-masing 27,3% dan18,2% dari total jumlah spesies. Keanekaragaman tertinggi ditemukan di pulau Kaki (5 spesies) dengan pulau Nusmapi memiliki sebaran spons tidak merata. Hasil penelitian kami menemukan tidak ada hubungan antara keanekaragaman spons dengan bentuk morfologi. Informasi dasar ini sangat penting untuk pengelolaan hotspot keanekaragaman hayati dalam perumusan keputusan untuk konservasi biota laut.
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.14098
      Issue No: Vol. 25, No. 3 (2022)
       
  • Aktivitas Antijamur dari Bakteri Sedimen Mangrove Terhadap Candida
           albicans dan Malassezia furfur

    • Authors: Ananda Arifidyani, AB Susanto, Wilis Ari Setyati
      Pages: 411 - 420
      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. 
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.15114
      Issue No: Vol. 25, No. 3 (2022)
       
  • 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
      Pages: 421 - 431
      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 pergerakan air di lingkungan laut.
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.14923
      Issue No: Vol. 25, No. 3 (2022)
       
  • Mikrofragmentasi Untuk Restorasi Karang Masif di Pulau Sambangan
           Karimunjawa

    • Authors: Dwi Haryanti, Alif Maskur, Munasik Munasik
      Pages: 432 - 438
      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 nilai 0,447 cm2/minggu. Kelulushidupan fragmen karang Porites dan Cyphastrea secara berurutan bernilai 100% dan 98,21%.  Hasil analisa laju pertumbuhan menggunakan One Way ANOVA menunjukkan berbeda nyata (P<0,05) pada karang Porites dan tidak beda nyata (P>0,05) pada karang Cyphastrea. Laju pertumbuhan tertinggi dicapai pada fragmen ukuran 2 cm2 pada fragmen karang Porites dan Cyphastrea. 
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.15124
      Issue No: Vol. 25, No. 3 (2022)
       
  • Alginate from Sargassum sp. Improve the Hematology Performance and Oxygen
           Tolerance Exposure of Lates calcarifer

    • Authors: Ervia Yudiati, Ali Djunaedi, Nuril Azhar, Rabia O. Alghazeer
      Pages: 439 - 447
      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.
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.16217
      Issue No: Vol. 25, No. 3 (2022)
       
  • Korelasi Konsentrasi Mikroplastik dengan Material Padatan Tersuspensi
           (MPT) di Perairan Delta Sungai Bodri, Kendal, Jawa Tengah

    • Authors: Sri Yulina Wulandari, Bambang Yulianto, Ocky Karna Radjasa, Dwi Haryo Ismunarti, Sri Sedjati
      Pages: 448 - 455
      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 pasang dan surut. Metode penelitian yang dilakukan adalah deskriptif kuantitatif. Konsentrasi mikroplastik ditentukan dengan metode yang direkomendasikan oleh NOAA, sedangkan penentuan konsentrasi MPT dilakukan dengan metode gravimetri. Hasil penelitian menunjukkan, bahwa rerata konsentrasi mikroplastik saat pasang lebih rendah yaitu sebesar 2,207 mg/L dibandingkan saat surut yaitu sebesar 2,615 mg/L. Rerata konsentrasi MPT saat pasang lebih rendah yaitu sebesar 193 mg/L dibandingkan saat surut yaitu sebesar 419 mg/L. Dapat dikatakan bahwa tingginya nilai rerata konsentrasi mikroplastik dan MPT pada saat surut mengindikasikan kalau mikroplastik dan MPT lebih banyak berasal dari daratan. Dari uji statistik dengan metode korelasi Pearson, hubungan antara mikroplastik dengan MPT termasuk kategori lemah. MPT mempengaruhi keberadaan mikroplastik hanya sebesar 3,19% (dengan koefisien determinasi sebesar 0,0319 dan p-value 0,508). Keberadaan mikroplastik tidak hanya disebabkan oleh adanya MPT, tetapi sebagian besar diduga dipengaruhi oleh faktor-faktor lain.
      PubDate: 2022-11-01
      DOI: 10.14710/jkt.v25i3.16121
      Issue No: Vol. 25, No. 3 (2022)
       
  • Logam Berat Mercury (Hg) dan Arsen (As) pada Hasil Tangkapan Nelayan
           Pesisir Semarang dan Tegal Jawa Tengah

    • Authors: Chrisna Adhi Suryono, Agus Indardjo
      Pages: 456 - 462
      Abstract: The Semarang and Tegal coastal waters are traditional fishing ground areas. However, the increasing use of coastal areas for various activities will increase pollutants in the coastal waters.  Heavy metals are pollutants that always appear in waters and accumulate in marine organisms. These study aims to determine As and Hg metals contained in the tissues of several marine organisms caught on the coast of Semarang and Tegal, Central Java. The analysis of As and Hg concentrations in organismal tissues using ICPMS.  The results showed that As and Hg were found in biota such as white shrimp (P. merguensis), blue crab (P. pelagicus), shellfish (A. inaequivalvis) and gastropods (H. ternatanus). Arsenic concentrations in the four biotas caught in Tegal (1.6 – 5.3 ppm) and Semarang (2.58 – 4.9 ppm). Meanwhile, Hg metal (0.02 – 0.15 ppm) in Tegal and (0.034 – 0.15 ppm) in Semarang.  The concentration level of As based on the biota caught in the Tegal waters are sequentially Shellfish > White shrimp > Gastropods > Blue swimming crab.  Meanwhile, the concentration of Arsenic in the biotas in Semarang waters are sequentially shellfish > white shrimp > blue crab > gastropods. However, Hg metal in the biota obtained in these two areas is very low  Pesisir Semarang dan Tegal merupakan daerah penangkapan perikanan tradisional.  Namun dengan semakin meningkatnya pemamnfaatan wilayah pesisir untuk berbagai kegiatan akan meningkatkan polutan dalam perairan.  Logam berat merupakan polutan yang selalu muncul dalam perairan dan terakumulasi organisme laut.  Penelitian ini bertujuan untuk mengetahui logam As dan Hg yang terdapat dalam jaringan beberapa biota yang ditangkap pesisir Semarang dan Tegal Jawa Tengah.  Analisa konsentrasi As dan Hg dalam jaringan organisme menguunakan ICPMS.  Hasil penelitian menunjukan logam As dan Hg ditemukan dalam biota seperti udang putih (P. Merguensis), rajungan (P. pelagicus), kerang bulu (A. inaequivalvis) dan gastropoda (H. ternatanus).  Konsentrasi Arsen di keempat biota yang ditangkap di Tegal (1,6 – 5,3 ppm) dan Semarang (2,58 – 4,9 ppm).  Sedangkan logam Hg (0,02 – 0,15 ppm) di Tegal dan (0,034 – 0,15 ppm) Semarang.  Tingkat konsentrasi logam As berdasarkan biota yang tertangkap di perairan Tegal secara berurutan Kerang bulu > Udang putih > Gastropoda > Rajungan.  Sedangkan konsentrasi Arsen dalam biota di perairan Semarang secara berurutan Kerang bulu > Udang putih > Rajungan > Gastropoda.  Namun logam Hg dalam biota yang didapat di kedua daerah tersebut sangat rendah. 
      PubDate: 2022-11-27
      DOI: 10.14710/jkt.v25i3.16279
      Issue No: Vol. 25, No. 3 (2022)
       
 
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