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INDONESIA
BULETIN OSEANOGRAFI MARINA
Published by Universitas Diponegoro
ISSN : 20893507     EISSN : 25500015     DOI : -
Core Subject : Science,
Earth & Planetary Sciences
Buletin Oseanografi Marina (BULOMA) adalah jurnal yang menginformasikan hasil penelitian dan telaah pustaka tentang aspek Oseanografi, Ilmu Kelautan, Biologi Laut, Geologi Laut, Dinamika Laut dan Samudera, Estuari, Kajian Enerji Alternatif, Mitigasi Bencana, Sumberdaya Alam Pesisir, Laut dan Samudera.
Arjuna Subject : -
Articles 15 Documents
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Search results for , issue "Vol 12, No 1 (2023): Buletin Oseanografi Marina" : 15 Documents clear
Dampak Variabilitas Iklim Inter-Annual (El Niño, La Niña) Terhadap Curah Hujan dan Anomali Tinggi Muka Laut di Pantai Utara Jawa Tengah Meida Yustiana; Muhammad Zainuri; Denny Nugroho Sugianto; Mahardiani Putri Naulia Batubara; Anistia Malinda Hidayat
Buletin Oseanografi Marina Vol 12, No 1 (2023): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v12i1.48377

Abstract

El Niño dan La Niña memiliki pengaruh signifikan terhadap dinamika cuaca di wilayah Indonesia. Oleh karena itu, penelitian ini bertujuan untuk mengetahui dampak fenomena tersebut terhadap curah hujan (CH) dan anomali tinggi muka laut (TML) di Pantai Utara Jawa Tengah meliputi wilayah Brebes, Pemalang, Pekalongan dan Semarang menggunakan analisis kuantitatif deskriptif selama  1993 – 2020. Data yang digunakan pada penelitian ini adalah anomali TML, anomali suhu permukaan laut, dan data observasi CH bulanan dari pos hujan Pusdataru dan BMKG. Data tersebut ditampilkan dalam bentuk grafik anomali CH dan grafik overlay indeks Nino 3.4 dan anomali TML yang dikelompokkan berdasarkan data komposit 3 bulan. Hasil analisis menunjukkan bahwa pada periode pengamatan terjadi 2 kali El Niño sangat kuat pada November 1997 dan November 2015 dan juga 2 kali La Niña kuat pada Januari 2000 dan Januari 2008 dengan periode perulangan rerata setiap 8 tahun. Hubungan signifikan antara El Niño dan La Niña yang diwakili oleh indeks Nino 3.4 terhadap CH di Indonesia terjadi pada periode September-Oktober-November (SON), dengan nilai koefisien korelasi -0.53692 – (-0.7304). Masih dalam periode yang sama, hubungan anomali CH dan anomali TML juga menunjukkan nilai koefisien korelasi tertinggi di Semarang, Pekalongan dan Pemalang sebesar 0.546202 - 0.676914.  El Niño and La Niña are two of several components of climate variability which has significant influence toward weather dynamics over Indonesia, including on the North Coast of Central Java. For this reason, this research aims to determine the impact of these two phenomena on rainfall and sea level anomaly (SLA) on the North Coast of Central Java covering Brebes, Pemalang, Pekalongan, and Semarang Regions using descriptive quantitative analysis using data from 1993 – 2020. The data used in this study were SLA, sea surface temperature anomaly in the Nino 3.4 region, and monthly rainfall observation data from the Pusdataru and BMKG rain posts, displayed in the form of a rainfall anomaly graph and an overlay graph of the Nino 3.4 index and SLA and grouped based on 3 months composite data. The analysis result showed that during the observation period there were two strong El Niño, in November 1997 and 2015, and also two strong La Niña in January 2000 and 2008 with a repeating period every eight years. The significant relationship between El Niño and La Niña represented by the Nino index 3.4 on rainfall in Indonesia occurred in September-October-November (SON), with a correlation coefficient of -0.53692 – (-0.7304). Still in the same period, the relationship between rainfall anomaly and SLA also showed that the highest correlation coefficient value occurs in the SON month in Semarang, Pekalongan, and Pemalang at 0.546202 - 0.676914.
Gastropoda Mangrove Terebralia palustris (Linnaeus 1767) di Pantai Payum Kabupaten Merauke Papua Dandi Saleky; Rika Anggraini; Sendy L. Merly; Arina Ruzanna; Muhammad Fauzan Isma; Jemmy Manan; Agus Putra Abdul Samad; Riri Ezraneti; Syahrial Syahrial
Buletin Oseanografi Marina Vol 12, No 1 (2023): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v12i1.46376

Abstract

Gastropoda banyak ditemukan di ekosistem mangrove dan sangat dipengaruhi oleh kondisi lingkungan maupun kerapatan hutan mangrove. Salah satu gastropoda yang ditemukan adalah Terebralia palustris yang sering dijadikan sebagai bioindikator kesehatan mangrove. Kajian T. palustris (Linnaeus 1767) dilakukan pada bulan September 2020 di hutan mangrove Pantai Payum Merauke Papua dengan 3 stasiun pengamatan. Kajian ini bertujuan untuk mengetahui kepadatan, hubungan panjang berat tubuh, kualitas dan penciri lingkungannya serta faktor penentu distribusi dan kepadatan T. palustris di Pantai Payum. T. palustris maupun mangrove dikumpulkan dengan membuat transek garis sepanjang 50 m tegak lurus garis pantai dan dibuat petak-petak contoh berukuran 10 x 10 m untuk mangrove serta 1 x 1 m (di dalam plot 10 x 10 m) untuk T. palustris. Hasil kajian memperlihatkan bahwa kepadatan T. palustris bervariasi di setiap stasiun pengamatan dengan kepadatan tertinggi berada pada Stasiun 2 (54,20 ind/m2) dan terendahnya pada Stasiun 3 (19,67 ind/m2). Pola pertumbuhan T. palustris bersifat allometrik negatif. Untuk kualitas lingkungan secara keseluruhan, hasil penghitungan memperlihatkan bahwa kerapatan mangrovenya tergolong tinggi (> 1000 ind/ha) dengan parameter kualitas perairan untuk suhunya berkisar antara 28,33 – 31,67°C, DO 5,60 – 7,67 mg/L, pH 6,83 – 7,53 dan salinitas 29,33 – 30,00‰. Analisis PCA memperlihatkan bahwa penyebaran stasiun pengamatan dan karakteristik lingkungan membentuk 2 kelompok dengan kelompok pertama Stasiun 3 dipengaruhi oleh salinitas, suhu, DO dan kerapatan mangrove yang tinggi, sedangkan kelompok kedua Stasiun 1 dan 2 dipengaruhi oleh pH yang tinggi serta diameter batang mangrove yang besar. Berdasarkan hasil analisis PCA, faktor penentu distribusi dan kepadatan T. palustris adalah suhu, DO dan kerapatan mangrove.   Many mangrove habitats contain gastropods, which are greatly influenced by environmental conditions and the density of mangrove trees. One of the gastropods discovered was Terebralia palustris, which is frequently employed as a bioindicator of mangrove health. A research of T. palustris (Linnaeus, 1767) was done in September 2020 at three observation sites in the mangrove forest of Payum Beach, Merauke Papua. This study aims to evaluate the density, the relationship between body length and weight, the quality and characteristics of the environment, and the distribution and density determinants of T. palustris in Payum Beach. T. palustris and mangroves were gathered by constructing a 50 m perpendicular to the seashore line transect and creating 10 x 10 m plots for mangroves and 1 x 1 m plots (within a 10 x 10 m plot) for T. palustris. The study revealed that the density of T. palustris fluctuated at each observation station, with the highest density occurring at Station 2 (54.20 ind/m2) and the lowest density occurring at Station 3 (19.67 ind/m2). The T. palustris growth pattern is negative allometric. The calculation findings indicate that the mangrove density is high (> 1000 ind/ha) and that the water quality parameters range from 28.33 to 31.67°C, DO 5.60 to 7.67 mg/L, pH 6.83 to 7.53, and salinity 29.33 to 30.00‰. PCA analysis revealed that the distribution of observation stations and environmental parameters formed two groups, with Station 3 influenced by salinity, temperature, DO, and a high mangrove density, and Stations 1 and 2 influenced by a high pH and a big mangrove trunk diameter. According to the results of PCA analysis, the distribution and density of T. palustris are determined by temperature, DO, and mangrove density.
Exploring the Community Structure of Plankton in the Maricultures Sites of Kodek Bay, Lombok Island Widiastuti Widiastuti; Sheliya Desmita Br. Bangun; Ni Luh Yustika Giri; Varian Fahmi
Buletin Oseanografi Marina Vol 12, No 1 (2023): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v12i1.50094

Abstract

Mariculture is considered a future economic source for Indonesia. However, this practice may degrade the surrounding ecosystem by decreasing the water quality, including the plankton community. This study aimed to determine the community structure of plankton (phytoplankton and zooplankton) in the mariculture sites. Study sites were selected based on the mariculture activities of the Research Center for Marine and Terrestrial Bioindustry (PRBILD-BRIN) located in Kodek Bay, Lombok Island. Samplings were conducted in February 2021, zooplankton samples were collected horizontally by towing a 100 μm plankton net using a boat, whereas phytoplankton was collected using a 20 μm plankton net horizontally. The plankton samples were preserved with 4% formaldehyde, identified, and counted in a Sedgwick Rafter cell counter using an Olympus CX21 (10x). Results demonstrated that zooplankton was dominated by genera from the Subclass Copepoda (Temora sp., Microsetella sp., Euterpina sp., Oithona sp., Acartia sp., and Onceae sp.) that were significantly more abundant at Sites 1 and 2 than those at Sites 3 and 4. The diversity levels were moderate at all sites, except at site 1, which Temora dominated. Phytoplankton was mainly composed of Bacillariophyceae, followed by Dinophyceae, Chlorophyceae, and Conjugatophyceae, with no significant difference in abundance at all sites. The diversity levels were low for all phytoplankton taxa at all sites except at site 2, where Bacillariophyceae and Dinophyceae equally composed the community. It is suggested that the mariculture organisms may shape these phytoplankton and zooplankton community structures by recycling particular nutrients. 
Potensi Klorofil dan Karotenoid Fitoplankton Dunaliella salina sebagai Sumber Antioksidan Rose Dewi; Tjahjo Winanto; Florensius Eko Dwi Haryono; Bintang Marhaeni; Ghina Hanifa; Dhia Nabila; Deny Rozaqul Muis; Syifa Khalisa
Buletin Oseanografi Marina Vol 12, No 1 (2023): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v12i1.49006

Abstract

Dunaliella salina merupakanfitoplankton Chlorophytayang potensial dikembangkan sebagai pakan alami, memiliki kandungan pigmen fotosintetikuntuk merespon intensitas cahaya dalam proses fotosintesisyakni klorofil dan karotenoid. Salah satu pemanfaatan pigmen fotosintetiksebagai sumber antioksidan. Sejauhini Pembudidaya ikan menggunakanpakan buatan maupun antioksidan sintestis dalam jumlah tinggi. Kajian ini diharapkan mampu meminimalisir penggunaan antioksidan sintetis dengan pemanfaatan pigmen fotosintetik. D. salina memiliki kemampuanmengakumulasi sejumlah pigmen fotosintetik dalam jumlah tinggi padakondisi terstimulasi, salah satunya adanya intensitas cahaya tinggi.Penelitian ini bertujuan untuk mengetahui intensitas cahaya yang dapat diresponpigmen fotosintetik secara optimal. Kajian menggunakanmetode eksperimental dengan variasiintensitas cahaya 500 lux(A);1029 lux(B); 2000 lux(C). D. salina dikulturpada media walne 1L (3x ulangan)tiap perlakuan. Konsentrasi pigmen fotosintetik klorofil a, b dan karotenoid (mg/m3)diukur menggunakan spektrofotometer UV-Vis pada absorbansi 470, 652 dan 665 nm. Hasil menunjukkan optimalitas konsentrasi klorofil a (0,049±0,015)mg/m3, klorofil b (0,055±0,025) mg/m3 dan karotenoid (0,178±0,122) mg/m3 pada intensitas cahaya tinggi (2000 lux). Hal ini membuktikanintensitas cahaya tinggi menyebabkan kondisi terstimulasi, yangmenyebabkanD.Salinamengakumulasi sejumlah pigmen fotosintetik dalam jumlah tinggi. D.salinamampu berstrategi mentoleransi intensitas cahaya tinggi hingga ambang batas tertentuuntuk mencapai optimalisasi pigmen, pembentukan produk fotosintesisserta menghasilkansenyawa antioksidan. Dunaliella salina is a Chlorophyta phytoplankton that has the potential to be developed as natural food, containing photosynthetic pigments to respond to light intensity in the photosynthesis process that is chlorophyll and carotenoids. One of the utilization of photosynthetic pigments as a source of antioxidants. So far, many fish cultivators use artificial feed and synthetic antioxidants. This research is expected to minimize the use of synthetic antioxidants by using photosynthetic pigments. D. salina has the ability to accumulate high amounts of photosynthetic pigments under stimulated conditions, one of which is the presence of high light intensity. This study aims to determine the optimal light intensity that can be responded by photosynthetic pigments. The study used an experimental method with variations in light intensity of 500 lux(A); 1029lux(B); 2000 lux(C). D. salina was cultured on 1L Walne medium (3x replicates) for each treatment. The concentrations of photosynthetic pigments chlorophyll a, b and carotenoids (mg/m3) were measured using a UV-Vis spectrophotometer at absorbances of 470, 652 and 665 nm. The results showed that the optimal concentration of chlorophyll a (0.049±0.015) mg/m3, chlorophyll b (0.055±0.025) mg/m3 and carotenoids (0.178±0.122) mg/m3 at high light intensity (2000 lux). This proves that high light intensity causes a stimulated condition, which causes D. Salina to accumulate high amounts of photosynthetic pigments. D.salina is able to tolerate strategies of high light intensity up to a certain threshold to achieve pigment optimization, formation of photosynthetic products and produce antioxidant compounds.
Assessment of Total Suspended Solid Concentration Dynamics Based on Geospatial Models as an Impact of Anthropogenic in Pekalongan Waters, Indonesia Arij Kemala Yasmin Ridarto; Muhammad Zainuri; Muhammad Helmi; Kunarso Kunarso; Baskoro Baskoro; Lilik Maslukah; Hadi Endrawati; Gentur Handoyo; Magaly Koch
Buletin Oseanografi Marina Vol 12, No 1 (2023): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/buloma.v12i1.51454

Abstract

Changes in total suspended solids (TSS) concentrations provide information to determine the quality of the carrying capacity of waters as marine resources. This research aims to analyze the concentration and distribution of TSS in marine waters due to anthropogenic impacts on land. The concentration and distribution changes of TSS were analyzed using a geospatial model approach. The in-situ data were collected in August 2021 and June 2022 at 11 stations in the east monsoon and analyzed in the laboratory using the gravimetric method. The results show that TSS concentration changes at the study area significantly increased concentration from 40,3-85,4 mg/L in 2021 to 64,7-140,5 mg/L in 2022, increased by 37,6 – 39,2%, distributed to the east in open water due to the influence of the surface current, which is driven by the wind and tidal current. The anthropogenic factors, such as land use and micro-industrial activities, were dominantly correlated with the increase in TSS concentration in the waters, which is driven by input from land due to the influence of precipitation. This research provides comprehensive monitoring, evaluating, and managing scheme data and information to researchers, local governments, and environmentalists for mitigation planning to reduce the subtraction of water quality due to anthropogenic impacts.

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