Jurnal Kelautan: Indonesian Journal of Marine Science and Technology
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Analisa Pertumbuhan Karang dengan metode CPCe dan Sistem Pemeliharaannya pada Program Restorasi Karang di Nusa Penida Bali
No full textABSTRAKKondisi ekosistem terumbu karang di perairan Ped, Nusa Penida berada dalam kategori sedang. Kategori ini mengindikasikan pentingnya kegiatan restorasi. Kegiatan restorasi dengan metode transplantasi ini telah dilakukan pada bulan Agustus 2022 oleh NGO lokal yang bekerja sama dengan kelompok masyarakat dalam segi pemeliharaan berkelanjutan. Tujuan penelitian ini adalah untuk mengetahui kondisi pertumbuhan fragmen karang, rata-rata pertumbuhan dan faktor keterlibatan kelompok masyarakat yang berpengaruh terhadap pertumbuhan fragmen karang hasil kegiatan restorasi di perairan Ped, Nusa Penida. Metode penelitian ini adalah dengan menggunakan perangkat lunak bernama Coral Point Count with excel extensions (CPCe) untuk menghitung luas 80 fragmen karang pada periode 1 atau 1 bulan setelah transplantasi, periode 2 atau 3 bulan setelah transplantasi dan periode 3 atau 5 bulan setelah transplantasi, kemudian dilanjutkan dengan melakukan uji R2. Variabel independen yaitu faktor eksternal dan kondisi perairan serta variabel dependen yaitu pertumbuhan fragmen karang. Hasil penelitian ini adalah pertumbuhan fragmen karang meningkat relatif linear selama 5 bulan penelitian. Total fragmen yang hidup adalah 76 dari 80 fragmen setelah 5 bulan. Laju pertumbuhan fragmen maksimal adalah pada periode 2 yaitu 0,46 cm2/hari dan menurun pada periode 3 yaitu 0,42 cm2/hari, hasil laju pertumbuhan merupakan landasan pentingnya pemeliharaan pada 3 bulan pertama setelah dilakukannya transplantasi. Uji R2 menunjukan hasil 0,99 yang berarti faktor pertumbuhan fragmen adalah 99% waktu pengukuran dan 1% faktor lainnya. Pemeliharaan dapat dilakukan oleh kelompok masyarakat karena kemampuannya dalam memiliki pendanaan dalam pemeliharaan yang membantu kelompok dari segi operasional. Hasil penelitian pertumbuhan fragmen karang pada substrat reef star menyatakan bahwa pertumbuhan fragmen selama 5 bulan adalah relatif linear dengan tingkat hidup fragmen karang tinggi.Kata kunci: reef star, terumbu karang, restorasi, laju pertumbuhan.ABSTRACTThe condition of the coral reef ecosystem in Ped waters, Nusa Penida is in the medium category. This category indicates the importance of restoration activities. Restoration activities with the transplantation method have been carried out in August 2022 by local NGOs in collaboration with community groups regarding sustainable maintenance. The purpose of this study was to determine the condition of coral fragment growth, average growth, and community involvement factors that affect the growth of coral fragments resulting from restoration activities in the waters of Ped, Nusa Penida. The method of this study is to use a software called Coral Point Count with excel extensions (CPCe) to calculate the area of 80 coral fragments in period 1 or 1 month after transplantation, period 2 or 3 months after transplantation, and period 3 or 5 months after transplantation, then continued with R2 test. The independent variables are external factors and water conditions and the dependent variable is the growth of coral fragments. The results of this study were that the growth of coral fragments increased relatively linear over 5 months of the study. The total number of living fragments was 76 out of 80 after 5 months. The maximum fragment growth rate was in period 2 which was 0.46 cm2 / day and decreased in period 3 which was 0.42 cm2 / day, the results of the growth rate are the basis for the importance of maintenance in the first 3 months after transplantation. The R2 test showed a result of 0.99, which means that the fragment growth factor is 99% of the measurement time and 1% of other factors. Maintenance can be carried out by community groups because of their ability to have funding in maintenance that helps groups in terms of operations. The results of coral fragment growth research on reef star substrate stated that fragment growth for 5 months was relatively linear with a high survival rate of coral fragments.Keywords: reef star, coral reefs, restoration, growth rate
Chlorophyl-a Distribution and Sea Surface Temprature Using Modis Aqua Image Data in Bone Bay Waters
No full textABSTRACTOne of the parameters determining productivity in the sea is chlorophyll-a. The fertility level of chlorophyll-a is closely related to the concentration of chlorophyll-a. The higher the concentration of chlorophyll-a, the higher the water fertility level, conversely, if chlorophyll-a is low, the water fertility level will also be low. One factor influencing growth rate and chlorophyll-a production is temperature. This research aimed to determine the distribution of chlorophyll-a and sea surface temperature based on season in 2022 in the waters of Bone Bay using quantitative descriptive method and geographic information analysis (GIS) procedure in the form of analysis of Aqua MODIS remote sensing image data. The research results showed that the highest distribution of chlorophyll-a occurred in the east season with a concentration of 0.06-2.04 mg/m³, while the lowest distribution of chlorophyll-a occurred in the west season with a concentration of 0.07-1.76 mg/m³. Meanwhile, the highest intensity sea surface temperature distribution occurred in the west season, which was 28.76-37.09 °C and the lowest sea surface temperature distribution fell in the east season, which was 27.13-33.62 °C. Spatial temperature variability and sea surface chlorophyll-a can be used as information about potential areas for fishing grounds.Key words: chlorophyll-a distribution, sea surface temperature, Bone Bay, Aqua MODI
Aktivitas Ikan Karang di Rumah Ikan
No full textABSTRAK Rekayasa rumah ikan dengan memanfaatkan cangkang kerang mutiara merupakan salah satu inovasi dalam rangka menciptakan habitat buatan bagi ikan karang dan organisme karang lainnya. Penelitian ini bertujuan untuk menentukan aktivitas ikan pada rumah ikan. Pengamatan terhadap aktivitas ikan dilakukan dengan visual sensus, dan untuk data tersebut kemudian dianalisis secara deskriptif. Hasil pengamatan menunjukan bahwa ikan karang dan organisme lainnya yang berasosiasi dengan rumah ikan menggunakan rumah ikan untuk mencari makan maupun untuk berlindung. Spesies yang teramati melakukan aktivitas makan adalah Ctenochaetus striatus dan Zebrasoma rostratum. Spesies yang teramati memanfaatkan rumah ikan untuk berlindung adalah Chromis opercularis, Ctenochaetus striatus, Pomacentrus similis, Throcus niloticus, dan Pearsonothuria graeffei. Ketersediaan makanan pada struktur rumah ikan dan sekitarnya membuat ikan karang bergerak secara vertikal dan horisontal baik soliter maupun berkelompok untuk mencari makan. Struktur rumah ikan yang terdiri atas celah dan rongga membuat ikan karang dan organisme lainnya dapat berlindung dan berdiam di dalam struktur.Kata kunci: Aktivitas makan, Aktivitas berlindung, Ikan karang, Rumah ikanABSTRACTFish apartment engineering using pearl shells is one of the innovations in creating artificial habitats for reef fish and other coral organisms. This study aims to determine the activity of fish in the fish apartment. Observation of fish activity was carried out using a visual census, and the data was then analyzed descriptively. Observations showed that reef fish and other organisms associated with fish apartments use them for foraging and for shelter. Species observed for feeding activity were Ctenochaetus striatus and Zebrasoma rostratum. Species observed using fish apartment for shelter were Chromis opercularis, Ctenochaetus striatus, Pomacentrus similis, Throcus niloticus, and Pearsonothuria graeffei. The availability of food in the fish apartment structure and its surroundings makes reef fish move vertically and horizontally both solitary and in groups to find food. The structure of the fish apartment which consists of gaps and cavities allows reef fish and other organisms to take shelter and live in the structure Keywords: Feeding Activities, Shellter activities, Coral fish, Fish apartmen
The Mapping Of Shoreline Change Caused By Accretion And Abration As An Impact Of Tin Minning In Pangkalpinang
No full textABSTRACTBangka Island is the biggest tin producer in Indonesia. Pangkalpinang is the capital city of Bangka Belitung Archipelago which has 36 km2 shoreline and is one of the areas affected by anthropogenic activities especially tin minning activities. This study aims to determine the changes of position and rate of shoreline change in 2000 – 2022 using multitemporal imagery in Pangkalpinang. This study used remote sensing method (Algorhytm of Normalized Difference Water Index) and geographic information system with on screen digitation approach using DSAS (Digital Shoreline Analysis). Shoreline position measurement using the NSM analysis and rate of shoreline change using the EPR analysis. Digital image processing result showed that shoreline position at coastal region in Pangkalpinang has changed in 22 years. At sector A (Pasir Padi area), The land mass accretion/ maximum accretion occurred at Serata, Pasir Padi Beach adjacent to Batu Rusa estuary which was 63,6 m with shoreline rate change was approximately 2.89 m/year, while the land mass decreasement/ highest abration occurred in Pasir Padi Beach was 164,5 m with the shoreline rate change was approximately 7.48 m/ year. At sector B (Tanjung Bunga Area) abration occurred was -124.6 m with the shoreline rate change was approximately 5.66 m/year. At sector C (Sampur Beach Area) abration occurred was 81 m with shoreline rate change was 3.68 m/tahun. The average of shoreline change rate in Pangkalpinang affected by abration was 2.5 m/year while the average of shoreline change affected due to accretion was 2.89 m/year whereas there were 2 beaches in Pangkalpinang which did not experience the accretion, namely Tanjung Bunga Beach and Sampur Beach.Keywords: Shoreline, Pangkalpinang, Accretion, Abration, Tin Minnin
Analisis Perubahan Garis Pantai Akibat Terjadinya Siklon Tropis Seroja di Pulau Sabu Nusa Tenggara Timur
No full textABSTRAKPerubahan garis pantai di wilayah pesisir disebabkan oleh berbagai faktor alami dan antropogenik seperti gelombang laut, arus permukaan, dan aktivitas manusia. Perubahan ini dapat berdampak signifikan terhadap lingkungan dan kehidupan manusia di wilayah tersebut. Penelitian ini fokus pada perubahan garis pantai di Pulau Sabu, Nusa Tenggara Timur, sebagai dampak Siklon Tropis Seroja pada April 2021. Data satelit Sentinel-2A dan data oseanografis digunakan untuk menganalisis perubahan garis pantai, arah, dan ketinggian gelombang signifikan, serta kecepatan arus permukaan selama periode siklon. Hasil analisis menunjukkan bahwa ketinggian gelombang signifikan mencapai 4 m dan arus berkecepatan melebihi 1,1 m/s. Perubahan garis pantai menunjukkan sebagian besar wilayah penelitian mengalami abrasi, dengan Desa Waduwalla, Ledeae, dan Ramedue mengalami abrasi yang besar. Di sisi lain, Desa Lobohede mengalami akresi terbesar. Jarak abrasi terbesar mencapai 34,97 m dengan laju abrasi 46,28 m/tahun. Total luas daratan yang mengalami abrasi adalah 45,18 hektar, sementara akresi hanya 1,13 hektar. Hasil ini memberikan pemahaman yang lebih baik tentang dampak Siklon Tropis Seroja terhadap perubahan garis pantai di Pulau Sabu, yang dapat digunakan untuk merumuskan kebijakan perlindungan pesisir dan mitigasi risiko di masa depan.Kata Kunci: Garis pantai, abrasi, akresi, Sentinel-2AABSTRACTShoreline changes in coastal areas are caused by various natural and anthropogenic factors such as ocean waves, surface currents and human activities. These changes can have significant impacts on the environment and human life in the region. This study focuses on shoreline changes on Sabu Island, East Nusa Tenggara, as a result of Tropical Cyclone Seroja in April 2021. Sentinel-2A satellite data and oceanographic data were used to analyze shoreline changes, significant wave height and direction, and surface current velocity during the cyclone period. The analysis showed that significant wave heights reached 4 m and current speeds exceeded 1,1 m/s. Shoreline changes showed that most of the study area experienced abrasion, with Waduwalla, Ledeae and Ramedue villages experiencing major abrasion. On the other hand, Lobohede Village experienced the greatest accretion. The largest abrasion distance reached 34,97 m with an abrasion rate of 46,28 m/year. The total area of land experiencing abrasion is 45,18 hectares, while accretion is only 1,13 hectares. These results provide a better understanding of the impact of Cyclone Seroja on shoreline change in Sabu Island, which can be used to formulate coastal protection and risk mitigation policies in the future.Keywords: Shoreline, abrasion, accretion, Sentinel-2A
Analisa Indeks Saprobitas di Perairan Padelegan Sebagai Air Baku Tambak Garam UTM
No full textABSTRAKPlankton merupakan organisme perairan yang keberadaannya dapat menjadi bioindikator perubahan kualitas biologi perairan. Plankton memiliki peran penting dalam mempengaruhi produktivitas primer perairan laut khususnya fitoplankton. Fitoplankton merupakan mikroorganisme authotroph sehingga dapat membuat makanannya sendiri dengan cara fotosintesis. Dengan demikian, fitoplankton di perairan dapat dijadikan sebagai petunjuk untuk mengetahui kondisi atau kualitas dan tingkat pencemaran suatu perairan. Tujuan dari penelitian ini adalah untuk mengetahui kualitas dan tingkat pencemaran pada air laut sumber utama pembuatan garam di tambak garam UTM. Metode yang digunakan adalah menghitung kelimpahan dan indeks saprobitas sebagai acuan dalam menentukan tingkat pencemaran dengan waktu pengambilan sampel pada pagi, siang serta malam. Berdasarkan hasil perhitungan kelimpahan fitoplankton pada setiap titik pengambilan sampel 15.000 ind/l yang tergolong eutrofik yaitu perairan memiliki tingkat kesuburan yang tinggi. Tingkat pencemar perairan sesuai dengan indeks saprobitas tergolong sedang β/α-mesosaprobik pada sampel siang hari dan ringan β -mesosaprobik pada sampel pagi dan malam hari.Kata kunci : Fitoplankton, Indeks saprobitas, Tambak Garam UTMABSTRACKPlankton are aquatic organisms whose presence can be a bioindicator of changes in the biological quality of waters. Plankton has an important role in influencing the primary productivity of marine waters, especially phytoplankton. Phytoplankton are autotroph microorganisms that can make their own food by photosynthesis. Thus, phytoplankton in the waters can be used as a guide to determine the condition or quality and level of pollution of a waters. The purpose of this study was to determine the quality and level of pollution in seawater, the main source of salt production in UTM salt ponds. The methodused is to calculate the abundanceof phytoplankton and saprobity index as a reference in determining the level of pollution by sampling time in the morning, afternoon and evening. Based on the calculation of the abundance of phytoplankton at each sampling point 15,000 ind/l which is classified as eutrophic, the waters have a high level of fertility. The water pollutant level according to the saprobity index was classified as moderate β /α-mesosaprobic in the daytime sample and light β -mesosaprobic in the morning and evening samples.Keyword: Phytoplankton, Saprobity Index, Salt Pond UT
