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Jurnal Kelautan Tropis
Published by Universitas Diponegoro
ISSN : 14108852     EISSN : 25283111     DOI : -
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Articles 451 Documents
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Molecular phylogenetic analysis of commercially important Asian monsoon scallop, Amusium pleuronectes (Linnaeus 1758) from Indonesia Eko Hardianto; Tony Budi Satriyo
Jurnal Kelautan Tropis Vol 26, No 3 (2023): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v26i3.18049

Abstract

The Asian monsoon scallop, Amusium pleuronectes, is a key member of shellfish communities that are the most commercially harvested in Asia. Materials were obtained from four sites in Indonesia: Semarang, Bali Island, Maros and Buru Island. Nucleotide sequence analysis was performed on PCR-amplified mitochondrial DNA 16S rRNA. In total, 556-558 base pair nucleotide sequences were obtained from 8 individuals. Molecular analyses revealed that the samples belong to the A. pleuronectes species. Phylogenetic analyses were carried out by comparing the gene sequences of A. pleuronectes haplotypes in Indonesia with gene sequences of the same base pair length and with the of A. japonicum which was used as an outgroup. The phylogenetic trees were consistent and indicated in the two sub-clades. The presence of A. pleuronectes and the phylogenetic status of the A. pleuronectes Indonesian haplotype were reported. Clarifying the phylogenetic status of ecologically important species provides basic information for biosecurity studies for possible future conservation and control programs.
Bioaccumulation of Lead (Pb) on The Dog Conch (Strombus canarium) in Madong Waters, Tanjung Pinang Tirtama, Wahyu; Bengen, Dietriech Geoffrey; Rastina, Rastina
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.22358

Abstract

The waters of Madong in Tanjung Pinang city are located in a strategic area that has a significant impact on the livelihoods of fishermen, post-bauxite mining areas, ship traffic, and population activities. These factors have contributed to the contamination of heavy metal Pb in the waters, sediments, and dog conch. The purpose of this study is to analyze the levels of heavy metal Pb in the waters, sediment, and dog conch, and to assess the bioaccumulation factors of heavy metal Pb in dog conch in Madong waters. Samples of waters, sediment, and dog conch were collected from three stations and analyzed using AAS at the Marine Chemistry Laboratory of Raja Ali Haji Maritime University. The concentration of Pb in the waters ranged from 0.0204 mg/L to 0.0636 mg/L, while the concentration of Pb in sediment ranged from 0.5947 mg/Kg to 0.9402 mg/Kg. The Pb metal concentration in juvenile dog conch ranged from 0.0745 mg/Kg to 0.3437 mg/Kg. The highest BAF and BSAF values for Pb metal in adult dog conch were observed at station 1, with values of 27.241 and 0.6991, respectively. The categorization of Pb metal in Strombus canarium dog conch as low is based on the BAF and BSAF value categories.
Distribution Pattern of Chlorophyll-a in the Delta Wulan Waters, Demak Regency, Central Java, Indonesia Widianingsih, Widianingsih; Hartati, Retno; Endrawati, Hadi
Jurnal Kelautan Tropis Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i1.21827

Abstract

The Delta Wulan waters are categorized as estuarine waters, which are greatly influenced by the sedimentation from the Wulan River and Serang River. Besides, the Delta Wulan Waters are vulnerable to the impact of pollution from anthropogenic waste. This research aims to examine the distribution pattern of chlorophyll-a and water quality parameters in the Delta Wulan Waters. Samplings were carried out at 12 stations, which were located in the middle of the Delta Wulan waters. One liter of water samples was taken using a Niskin bottle. The water quality measurements were carried out in situ. The research revealed that the highest chlorophyll-a value was found at Station 11 (2.94 ug/L) in November 2023, and the lowest chlorophyll-a value was also found in November 2023 at Station 6 (0.01 ug/L). Meanwhile, in August 2023, the chlorophyll-a value was in the range of 0.53–8.02 µg/L. The observations in August and November showed that the distribution pattern of chlorophyll-a was regular for stations 1 to 12 (dispersion index value < 1)
Microzonasi Perubahan Garis pantai Akibat Pengaruh Rip Current di Pantai Kota Bani Bengkulu Supiyati, Supiyati; Johan, Septi; Suwarsono, Suwarsono; Putri, Hestyna Eka
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.22262

Abstract

The coastal of Kota Bani in Bengkulu is directly connected to the Indian Ocean, which has strong waves and currents that have the potential for rip currents. Recently, Kota Bani coast has experienced rapid shoreline changes caused by abrasion. Therefore, the purpose of this study is to identify rip current generating parameters, microzonation mapping of shoreline changes and its relationship with the potential zone of rip current occurrence at Kota Bani Coast, Bengkulu. The methods used in this study were in situ measurement of rip current generating parameters and identification of rip current using drone photos and USGS data to see shoreline changes. Analysis was done descriptively and quantitatively. Based on the research results, the type of breaking wave found at Kota Bani Coast is the plunging type with an irribaren value of 0.3 - 2.3. The potential for rip current occurs more in the west season than in the first transitional season. Rip current speeds of 3 m/s in the west season and 2.2 m/s in the first transitional season. Based on photo data of the coastline from the USGS for 10 years, the abrasion zone experienced a total coastline setback of 149.9 meters and in the non-abrasion zone experienced a total coastline increase (sedimentation) of 113.3 meters, with an average per year.  Pantai Kota Bani Bengkulu Utara berhubungan langsung dengan Samudera Hindia yang memiliki gelombang dan arus kuat yang memiliki potensi kemunculan rip current. Akhir-akhir ini Pantai kota Bani mengalami perubahan garis pantai yang sangat cepat yang disebabkan abrasi. Oleh sebab itu tujuan penelitian ini adalah mengidentifikasi parameter pembangkit rip current, pemetaan microzonasi perubahan garis pantai dan  hubungannya dengan zona potensi rip current di Pantai Kota Bani Bengkulu. Metode yang digunakan dalam penelitian ini adalah pengukuran in situ parameter pembangkit rip current dan identifikasi rip current menggunakan foto drone serta data USGS utuk melihat perubahan garis pantai. Analisis dilakukan secara diskriptif dan kuantitatif. Berdasarkan hasil penelitian diperoleh tipe gelombang pecah yang terdapat di Pantai Kota Bani yaitu tipe plunging dengan nilai irribaren 0,3 - 2,3. Potensi kemunculan rip current lebih banyak terjadi pada musim barat dibandingkan musim peralihan I. Kecepatan rip current pada musim barat 3 m/s dan pada musim peralihan I 2,2 m/s. Berdasarkan data foto garis pantai dari USGS selama 10 tahun zona terabrasi terjadi total kemunduran garis pantai 149,9 meter dan pada zona tidak terabrasi mengalami total kemajuan garis pantai (sedimentasi) 113,3 meter, dengan rata-rata perubahan garis pantai per tahun 3,7 m. Zona abrasi dan tidak terabrasi sama-sama berpotensi munculnya rip current, akan tetapi kemunculan rip current lebih banyak pada zona terabrasi, hasil yang didapat menunjukkan bahwa rip current menjadi salah satu faktor mempercepat terjadinya abrasi di Pantai Kota Bani.  
Analisa Lapisan Termoklin Musiman Di Perairan Indonesia (Studi Kasus Selat Malaka) Hendra, Hendra; Pranowo, Widodo Setiyo; Umam, Choirul; Azhari, Ferian; Agustinus, Agustinus
Jurnal Kelautan Tropis Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i1.20780

Abstract

The Malacca Strait is a strategic waterway for Indonesia as it serves as an international shipping route connecting East Asia with the Middle East and Europe. In addition, the Malacca Strait also has great potential for natural resources, such as oil and gas as well as fish and other marine products. This study aims to describe the Thermocline Layer in the Malacca Strait based on Marine Copernicus Data in 2020 with a depth of up to 1000 meters. The temperature data was visualized using ODV 5.5.2 software. The results of processing the Marine Copernicus Temperature Data in 2020 in the Malacca Strait with a depth of up to 1000 meters show that the thermocline boundary varies each season. In the western season, the thermocline boundary is at a depth between 11 meters to 131 meters, in the first transitional season, it is at a depth between 22 meters to 131 meters, in the eastern season, it is at a depth between 56 meters to 156 meters, and in the second transitional season, it is at a depth between 78 meters to 131 meters. Bagian Selat Malaka adalah perairan yang strategis bagi Indonesia karena menjadi jalur pelayaran internasional yang menghubungkan Asia Timur dengan Timur Tengah dan Eropa. Selain itu, Selat Malaka juga memiliki potensi sumber daya alam yang besar, seperti minyak dan gas bumi serta ikan dan hasil laut lainnya. Penelitian ini bertujuan untuk mengidentifikasi dan menganalisis Lapisan Termoklin di Perairan Selat Malaka berdasarkan Data Marine Copernicus tahun 2020 dengan kedalaman sampai 1000 meter. Data Temperatur diolah dan dianalisis menggunakan software ODV 5.5.2. Hasil pengolahan Data Temperatur Marine Copernicus tahun 2020 di Perairan Selat Malaka dengan kedalaman mencapai 1000 meter dengan batas termoklin setiap musim dimana pada Musim barat batas termoklin berada pada kedalaman antara 11 meter sampai dengan 131 meter, Musim Peralihan I batas termoklin berada pada kedalaman antara 22 meter sampai dengan 131 meter, Musim Timur batas termoklin berada peda kedalaman antara 56 meter sampai dengan 156 meter dan Musim Peralihan II batas termoklin berada pada kedalaman antara 78 meter sampai dengan 131 meter.
Analisis Karakteristik Marine Debris Terhadap Persentase Tutupan Terumbu Karang di Perairan Wangi-Wangi Taman Nasional Wakatobi Husmayani, Wa Ode; Zamani, Neviaty Putri; Ismet, Meutia Samira; Natih, Nyoman Metta N.; Sallatu, Muh Ashry
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.23052

Abstract

Based on data from the OECD's Global Plastic Outlook (2022), marine debris in the world has reached 350 million tons, which dominates plastic waste. Indonesia is the second country after Tingkok which produces the most marine debris. Based on the results of the National Waste Management Information System data from the Ministry of Environment and Forestry (Ministry of Environment and Forestry) it shows that Indonesia produces 34.85 million tonnes of landfilled waste. Of the total, 12.13 million tonnes of waste per year is not managed in 2022. The President of the Republic of Indonesia, Mr. Joko Widodo, is very concerned and committed to the waste problem and has a target to reduce marine plastic waste by 70% by 2025 in order to achieve the target set by the President of the Republic of Indonesia. Therefore, research on marine debris in coastal areas and small islands in Indonesia is very important information to research. This research was conducted in Wangi-Wangi Waters, Wakatobi Regency on 12-15 September 2023. The aim was to determine the type, abundance and weight of marine debris and its relationship with coral cover in Wangi-Wangi Waters. The marine debris sampling method is based on two characteristics, namely the intertidal zone (sandy beach) using the shoreline survey methodology and the subtidal zone (coral reef ecosystem) using the Belt Transect method (KLHK, 2020). ). Marine debris macro criteria range from (>2.5 cm - <1 m) Based on research results, the dominant abundance of macro marine debris was found to be 187 items/m2 of plastic, followed by wood and its derivatives 162 items/m2, glass 17 items/m2, cloth and its derivatives 12 items/m2 , fiber 12 items/m2, and rubber 8 items/m2. The total weight of macro marine debris in the intertidal zone is 574.10 grams/m2 and the subtidal zone is 178.7 grams/m2. Data on live coral cover ranges from 54.33% to 73.07%, good criteria. The relationship between the abundance of macro marine debris and coral cover has an inverse relationship, the higher the live coral cover, the lower the abundance of macro marine debris in that area. Berdasarkan data OECD’s Global Plastic Outlook (2022) marine debris di dunia telah mencapai sebesar 350 juta ton yang mendominasi sampah plastik. Indonesia menjadi negara peringkat kedua setelah tingkok penghasil marine debris terbanyak. Berdasrakan hasil data sistem informasi pengelolaan sampah Nasional dari KLHK (Kementrian Lingkungan Hidup dan Kehutanan) menunjukan bahwa Indonesia  mengahsilkan 34.85 juta ton timbunan sampah dari total tersebut 12.13 juta tonsampah per tahun sampah tidak di kelola pada tahun (2022). Presiden RI Bapak Joko widodo sangat konsen dan berkomitmen dengan permasalahan sampah dan memiliki target untuk menurunkan sampah plastik laut sebanyak 70% pada tahun 2025 dalam rangka mencapai target yang telah ditetapkan oleh presiden RI. Oleh karena itu maka penelitian marine debris di wilayah pesisir dan pulau-pulau kecil Indonesia merupakan suatu informasi sangat penting untuk diteliti. Penelitian ini dilakukan di Perairan Wangi-Wangi, Kabupaten Wakatobi pada 12-15 September 2023. Bertujuan untuk mengetahui jenis, kelimpahan,dan berat marine debris serta hubungannya dengan tutupan terumbu karang di Perairan Wangi-Wangi. Metode pengambilan sampel marine debris berdasarkan dua karakteristik yaitu zona intertidal (pantai berpasir) menggunakan metode survei garis pantai (shoreline survey methodology)dan zona subtidal (ekosistem terumbu karang) menggunakan metode Belt Transect atau transek sabuk (KLHK, 2020. Kriteria makro marine debris berkisar (>2.5 cm - <1.0 m)  Berdasarkan hasil penelitian kelimpahan macro marine debris yang dominan ditemukan yaitu jenis plastik sebanyak 187 item/m2, diikuti kayu dan turunannya 162 item/m2, kaca 17 item/m2, kain dan turunannya 12 item/m2, fiber 12 item/m2, dan karet 8 item/m2. Berat total macro marine debris pada zona intertidal sebesar 574.10 gram/m2 dan zona subtidal sebesar 178.7 gram/m2. Data tutupan karang hidup berkisar 54.33%-7307% kriteria baik. Hubungan kelimpahan macro marine debris dengan tutupan karang memliki hubungan yang berbanding terbalik, semakin tinggi tutupan karang hidup maka semakin rendah maka kelimpahan macro marine debris pada area tersebut.
Potensi Metabolit Kapang Endofit Mangrove Rhizophora apiculata sebagai Anti-Staphylococcus epidermidis Limbong, Maria Fransiska; Setyati, Wilis Ari; Sedjati, Sri; Sibero, Mada Triandala
Jurnal Kelautan Tropis Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i1.20133

Abstract

Mangrove association molds are known to produce secondary metabolite compounds that have antibacterial activity. The purpose of this study was to obtain anti-Staphylococcus epidermidis metabolites produced by the endophytic mold of mangrove Rhizophora apiculate. The screening process is carried out in exploratory descriptive research.  The stages of this research are sampling, mold isolation and purification, and macroscopic characterization. Initial screening of antibacterial activity is carried out by the agar plug method. Isolates that produce antibacterial metabolites are molecularly identified. The isolate was then cultured with Potato Dextrose Agar (PDA) media. The producing antibacterial metabolites were extracted using two solvents of different polarities (ethyl acetate and methanol) by stratified maceration method. Antibacterial metabolites are then tested to determine the concentration of extracts required to inhibit (Minimum Inhibitory Concentration (MIC) and kill bacterial growth (Minimum Bactericidal Concentration / MBC). The results of this study showed that there is one species of mangrove endophytic mold Rhizophora apiculata that can produce antibacterial metabolites against S. epidermidis, namely Diaporthe sennae.  These antibacterial metabolites are present in ethyl acetate extract. The resulting bioactivity based on the ability to inhibit bacterial growth can be seen from the MIC value of 2.5 mg / mL and the ability to kill bacteria with an MBC value of 5 mg / mL. The mold metabolite Diaporthe sennae could potentially be developed as an anti-Staphylococcus epidermidis  Kapang asosiasi mangrove diketahui menghasilkan senyawa metabolit sekunder yang memiliki aktivitas antibakteri. Tujuan penelitian ini adalah untuk mendapatkan metabolit anti-Staphylococcus epidermidis yang dihasilkan oleh kapang endofit mangrove Rhizophora apiculate. Proses skrining dilakukan secara diskriptif eksploratif.  Tahapan penelitian ini adalah pengambilan sampel, isolasi dan purifikasi kapang, serta karakterisasi makroskopis. Skrining awal aktivitas antibakteri dilakukan dengan metode agar plug. Isolat yang menghasilkan metabolit antibakteri diidentifikasi secara molekuler. Isolat tersebut selanjutnya dikultur dengan media Potato Dextrose Agar (PDA). Metabolit antibakteri yang dihasilkan diekstraksi menggunakan dua pelarut yang berbeda polaritas (etil asetat dan metanol) dengan metode maserasi bertingkat. Metabolit antibakteri kemudian diuji untuk menentukan konsentrasi ekstrak  yang diperlukan untuk menghambat (Minimum Inhibitory Concentration /MIC) dan membunuh pertumbuhan bakteri (Minimum Bactericidal Concentration /MBC). Hasil penelitian ini menunjukkan bahwa terdapat satu spesies kapang endofit mangrove Rhizophora apiculata yang yang dapat menghasilkan metabolit antibakteri  melawan S. epidermidis, yaitu Diaporthe sennae.  Metabolit antibakteri tersebut terdapat dalam ekstrak etil asetat. Bioaktivitas yang dihasilkan berdasarkan kemampuan menghambat pertumbuhan bakteri terlihat dari nilai MIC sebesar 2,5 mg/mL dan kemampuan membunuh bakteri dengan nilai MBC sebesar 5 mg/mL.  Metabolit kapang Diaporthe sennae berpotensi dikembangkan sebagai anti-Staphylococcus epidermidis 
Distribusi Target Strength Ikan Demersal Melalui Pengukuran Akustik Secara In-Situ Di Perairan Kahyapu Pulau Enggano Kabupaten Bengkulu Utara Bakhtiar, Deddy; Ompusunggu, Yordan A; Anggoro, Ari; Supiyati, Supiyati
Jurnal Kelautan Tropis Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i1.19793

Abstract

Kahyapu Waters is one of the potential waters for demersal fishing in Enggano Island. Demersal fish resources in Kahyapu Waters if exploited optimally can provide sustainable benefits for local fishermen. Target strength is one of the most important parameters in estimating fish stocks because this value is a scale in estimating the potential of fish resources. This study aims to analyze the average value of target strength (TS) of demersal fish through in-situ acoustic measurements, and describe the distribution of TS of demersal fish in Kahyapu.  Data were collected using Simrad EK15 echosounder by following the cruise track in the form of 8 zigzag transects and divided into 32 ESDU (Elementary Sampling Distance Unit). The results showed that the TS value of demersal fish had an average value of -48.93 dB with a range of values ranging from -67.34 dB to -38.77 dB with an estimated fish body length ranging from 1.08 to 28.91 cm. Spatial distribution of demersal fish target strength with the lowest depth of 6.4-16.9 m is located in ESDU 12 and ESDU 11 and the highest depth is 25.9-32.4 m located in transect 3 distribution of desmersal fish with the highest TS dominated scattered at a depth of 19.4-25.9 m.  Perairan Kahyapu merupakan salah satu perairan yang potensial untuk penangkapan ikan demersal di Pulau Enggano. Sumber daya ikan demersal di Perairan Kahyapu apabila dieksploitasi secara optimal dapat memberikan manfaat yang berkelanjutan bagi nelayan lokal. Target strength merupakan salah satu parameter yang sangat penting dalam pendugaan stok ikan karena nilai ini merupakan skala dalam pendugaan potensi sumberdaya ikan. Penelitian ini bertujuan untuk menganalisis nilai rata-rata target strength (TS) ikan demersal melalui pengukuran akustik secara in-situ, dan menggambarkan distribusi TS ikan demersal di Kahyapu.  Pengambilan data menggunakan echosounder Simrad EK15 dengan mengikuti jalur pelayaran berbentuk transek zig-zag sebanyak 8 transek dan dibagi menjadi 32 ESDU (Elementary Sampling Distance Unit). Hasil penelitian menunjukkan bahwa nilai TS ikan demersal memiliki nilai rata-rata -48.93  dB dengan rentang nilai berkisar -67.34 dB sampai -38.77 dB dengan dugaaan panjang tubuh ikan berkisar 1.08 sampai 28.91 cm. Distribusi Target strength ikan demersal secara spasial dengan kedalaman terendah 6,4-16,9 m terletak di ESDU 12 dan ESDU 11 dan kedalaman tertinggi adalah 25,9-32,4 m terletak di transek 3 sebaran ikan desmersal dengan TS tertinggi didominansi tersebar di kedalaman 19,4-25,9 m.
Estimasi Area Tergenang Akibat Kenaikan Muka Air Laut Menggunakan Data Unmanned Aerial Vehicles (UAV) pada Kawasan Pesisir Teluk Ambon Dalam, Provinsi Maluku, Indonesia (Studi Kasus: Kawasan Pesisir Desa Waiheru) Noya, Theo Imanuel; Gaol, Jonson Lumban; Agus, Syamsul Bahri
Jurnal Kelautan Tropis Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i2.23005

Abstract

The estimation model of potential tidal flooding areas in this study was built using altimetry satellite data for the period January 1993–July 2023, tidal data of Teluk Ambon Dalam (TAD) for the period 2012–2018, and Digital Terrain Model (DTM) data or land surface height recorded by the Unmanned Aerial Vehicle (UAV) DJI Mavic 2 Pro series. Satellite altimetry and tidal data were used to calculate the estimated values of the tidal flood inundation height in 2023 and 2050 under the highest tide conditions. UAV data recording was carried out at two variations of flight height, namely 80 m and 100 m, to determine the accuracy of the best geometry to be used in modeling. The bathtub-method approach was used to model the potentially inundated area by integrating the estimated inundation heights and DTM values. The results of the analysis of altimetry satellite data for the period 1993–2023 showed that the value of the sea level rise rate of Ambon Bay waters is 4 mm/year. The estimated value of tidal flood inundation extent in 2050 is 1.40 m. The flying height of 100 produces better geometry accuracy with a horizontal accuracy value of 1.51 m and vertical accuracy of 0.61 m at a scale of 1:5.000. Land elevation contours in the study area based on DTM data ranged from 0.12 - 1.82 m. Modeling results estimated that the inundated area in the study area in 2023 was 0.46 m and increased to 0.50 ha in 2050 due to sea level rise. Model estimasi area berpotensi tergenang banjir rob pada penelitian ini dibangun dengan menggunakan data satelit altimetri periode Januari 1993 – Juli 2023, data pasang-surut Teluk Ambon Dalam periode tahun 2012 - 2018 dan data Digital Terrain Model (DTM) atau ketinggian permukaan tanah hasil perekaman Unmanned Aerial Vehicle (UAV) seri DJI Mavic 2 Pro. Data satelit altimetri dan data pasut digunakan untuk menghitung nilai estimasi tinggi genangan banjir rob pada tahun 2023 dan 2050 saat kondisi pasang tertinggi. Perekaman data UAV dilakukan pada 2 variasi ketinggian terbang yakni 80 m dan 100 m untuk menentukan ketelitian geometri terbaik yang akan digunakan pada pemodelan. Pendekatan bathtub-method digunakan untuk memodelkan area berpotensi tergenang, yakni dengan mengintegrasikan nilai estimasi tinggi genangan dan nilai DTM. Hasil analisis data satelit altimetri periode tahun 1993 - 2023 memperoleh nilai laju kenaikan muka air laut perairan Teluk Ambon adalah 4 mm/tahun. Nilai estimasi jangkauan genangan banjir rob pada tahun 2050 adalah 1,40 m. Ketinggian terbang 100 menghasilkan ketelitian geometri yang lebih baik dengan nilai ketelitian horizontal adalah 1,51 m dan vertikal adalah 0,61 m pada skala 1:5.000. Kontur ketinggian tanah pada kawasan penelitian berdasarkan data DTM berkisar antara 0,12 – 1,82 m. Hasil pemodelan estimasi area tergenang pada kawasan penelitian tahun 2023 adalah seluas 0,46 m dan bertambah menjadi 0,50 ha pada tahun 2050 akibat kenaikan muka laut.
Sintasan, Kondisi Pertumbuhan, Pertumbuhan Penciri dan Faktor yang Mempengaruhi Pertumbuhan Kepiting Portunus pelagicus (Decapoda: Portunidae) di Ekosistem Mangrove Desa Kuala Langsa Putriningtias, Andika; Sinaga, Sorbakti; Faisal, Teuku Muhammad; Nugrahawati, Anis; Hatta, Muhammad; Syahrial, Syahrial; Manullang, Irma Warny Lamberta; Sihite, Fitri Suxes; Jamil, Muhammad
Jurnal Kelautan Tropis Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i1.19136

Abstract

The study was conducted in May - June 2018 in the water bodies of the mangrove ecosystem of Kuala Langsa Village with the aim of knowing survival, growth conditions, growth characteristics and environmental factors that affect the growth of Portunus pelagicus crabs while in the mangrove ecosystem. The method used was a one-factor completely randomized design with 4 treatment levels, where environmental parameters were collected in situ and ex situ with statistical analysis using ANOVA, orthogonal polynomials and PCA. The results of the study showed that the pH of the water ranged from 7.40 - 7.57, salinity 26.17 - 28.87‰, DO 4.92 - 5.88 mg/L, temperature 29.89 - 30.71°C, TDS 338.54 - 358.64 mg/L, pH H2O 4.43 - 4.51, pH KCL 2.96 - 3.59, C-organic 3.03 - 6.52%, N-total 0.19 - 0.26%, C/N 16.09 - 26.10 and P-available 19.12 - 21.52 ppm. In addition, survival ranged from 41.60 - 88.80%, absolute growth of carapace 13.80 - 30.80 cm, relative carapace 0.56 - 1.02 cm, absolute weight 16.10 - 18.50 gr, daily length 0.46 - 0.65 cm, daily width 0.36 - 0.59 cm and daily weight 0.72 - 0.93 gr. PCA analysis showed that the growth characteristics of P. pelagicus crabs in the mangrove ecosystem waters of Kuala Langsa Village were absolute length growth and daily length growth, while environmental factors that influenced their growth were C/N sediment parameters, C-organic sediments and water temperature.  Kajian dilakukan pada bulan Mei – Juni 2018 di badan perairan ekosistem mangrove Desa Kuala Langsa dengan tujuan untuk mengetahui sintasan, kondisi pertumbuhan, pertumbuhan penciri dan faktor lingkungan yang mempengaruhi pertumbuhan kepiting Portunus pelagicus saat berada di ekosistem mangrove. Metode yang digunakan adalah rancangan acak lengkap satu faktor dengan 4 taraf perlakuan, dimana parameter lingkungan dikumpulkan secara in situ dan ex situ dengan analisis statistik yang digunakan adalah ANOVA, polinomial ortogonal dan PCA. Hasil kajian memperlihatkan bahwa pH air berkisar antara 7.40 - 7.57, salinitas 26.17 - 28.87‰, DO 4.92 - 5.88 mg/L, suhu 29.89 - 30.71°C, TDS 338.54 - 358.64 mg/L, pH H2O 4.43 - 4.51, pH KCL 2.96 - 3.59, C-organik 3.03 - 6.52%, N-total 0.19 - 0.26%, C/N 16.09 - 26.10 dan P-tersedia 19.12 - 21.52 ppm. Selain itu, untuk sintasan berkisar antara 41.60 - 88.80%, pertumbuhan mutlak karapas 13.80 - 30.80 cm, nisbi karapas 0.56 - 1.02 cm, berat mutlak 16.10 - 18.50 gr, panjang harian 0.46 - 0.65 cm, lebar harian 0.36 - 0.59 cm dan berat harian 0.72 - 0.93 gr. Untuk analisis PCA menunjukkan bahwa penciri pertumbuhan kepiting P. pelagicus di perairan ekosistem mangrove Desa Kuala Langsa adalah pertumbuhan panjang mutlak dan pertumbuhan panjang harian, sedangkan faktor lingkungan yang mempengaruhi pertumbuhannya adalah parameter C/N sedimen, C-organik sedimen dan suhu air.

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