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All Journal METAMORFOSA Journal of Biological Sciences Journal of Marine and Aquatic Sciences Jurnal Biologi Udayana Bumi Lestari Ecotrophic, Journal of Environmental Science BULETIN OSEANOGRAFI MARINA Jurnal Ilmu Lingkungan Journal of Marine Research and Technology Jurnal Ilmiah Sains Jurnal Pengabdian Kepada Masyarakat Itekes Bali Journal of Fisheries & Marine Ulil Albab
Gede Surya Indrawan
Program Studi Ilmu Kelautan, Fakultas Kelautan Dan Perikanan, Universitas Udayana, Badung-Bali
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Environmental Science Health Professions Immunology & microbiology Mathematics Nursing Physics Public Health Social Sciences

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Struktur dan Komposisi Vegetasi pada Suksesi di Muara Sungai Unda, Kabupaten Klungkung, Bali I Made Saka Wijaya; Gede Surya Indrawan; Putu Angga Wiradana; I Made Sara Wijana; Abd. Rahman As-syakur; Adi Ariyanto Wibisono; Viryanando Evan Rahardja
JURNAL ILMIAH SAINS Volume 21 Nomor 1, April 2021
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1094.862 KB) | DOI: 10.35799/jis.21.1.2021.31744

Abstract

 Letusan Gunung Agung pada tahun 1963 memberikan dampak ekologis di sekitar muara Sungai Unda, Kabupaten Klungkung, Bali. Lahar yang mengalir melalui sungai tersebut menyebabkan terjadinya suksesi primer akibat tutupan pasir dan batu. Selama 57 tahun, muara Sungai Unda tidak hanya mengalami suksesi alam, tetapi juga mengalami suksesi antropogenik melalui pemanfaatan sebagai tambang pasir, lahan pastura, dan permukiman sementara.  Penelitian ini bertujuan untuk mempelajari struktur dan komposisi vegetasi pada suksesi di muara Sungai Unda. Penentuan struktur vegetasi dilakukan pada 8 stasiun penelitian dengan menggunakan metode plot dengan jumlah 24 plot pohon (20 x 20 m) dan 48 plot vegetasi lantai (1 x 1 m). Data dianalisis menggunakan parameter ekologis seperti densitas, densitas relatif, frekuensi, frekuensi relatif, dominansi, dominansi relatif, dan nilai penting, serta dilengkapi dengan indeks keragaman Shannon-Weiner (H’), indeks dominansi (C), dan indeks keseragaman (E). Hasil penelitian menunjukkan bahwa semak dan rumput merupakan bentuk hidup yang paling menentukan struktur vegetasi di Muara Sungai Unda. Beberapa spesies penyusun vegetasi tersebut merupakan tumbuhan invasif seperti yang harus dikontrol populasinya adalah Typha angustifolia, Ipomoea carnea, Chromolaena odorata, Lantana camara, dan Vachellia farnesiana. Berdasarkan indeks yang digunakan, keanekaragaman vegetasi termasuk dalam kategori tinggi, tanpa ada jenis yang mendominasi, dengan persebaran yang merata.Kata kunci: Gunung Agung; spesies invasive; suksesi antropogenik; vegetasi suksesiStructure and Composition of Successional Vegetation in Unda River, Klungkung Regency, BaliABSTRACTMount Agung eruption in 1963 caused major ecological impact around Unda River, Klungkung Regency, Bali. The volcanic mudflow that surpass the Unda River watershed initiate the primary succession in those areas. This research aimed to study the structure and composition of successional vegetation in Unda River. Twenty-four tree plots (20 x 20 m) and 48 understorey plots (1 x 1 m) derived from 8 research stations were used to determine the structure of vegetation. The data analyzed by ecological parameters, such as density, relative density, frequency, relative frequency, dominancy, relative dominancy, and importance value, then completed with Shannon-Weiner diversity index (H’), dominancy index (C), and evenness index (E). The results shown that the vegetation structure in Unda River determined by two major growth form: shrubs and grasses. Some notable invasive species that should be controlled are Typha angustifolia, Ipomoea carnea, Chromolaena odorata, Lantana camara, and Vachellia farnesiana. Based on the three indexes, the vegetation diversity was categorized as high diversity, without any species domination, and the distribution of the species are uniformKeywords: Anthropogenic succession; invasive species; Mount Agung; successional vegetation
Epifauna Pada Ekosistem Lamun Di Kawasan Pantai Sumberkima dan Pantai Karang Sewu, Bali Anisa Setyawati; Elok Faiqoh; Gede Surya Indrawan
Journal of Marine and Aquatic Sciences Vol 7 No 2 (2021)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2021.v07.i02.p17

Abstract

The seagrass field in the Sumberkima and Karang Sewu Beach are two of the habitats that support epifauna life. Epifaunas benefit the seagrass field by using it as a habitat, food supply source, and shelter from predators. This research aim to understand the epifauna density in the seagrass ecosystem, its correlation with seagrass density, and their condition in the Sumberkima and Karang Sewu Beach. This research was conducted in January – March 2020, which used the purposive randomize sampling method. Results show that Karang Sewu Beach only has the seagrass Enhalus acoroides, while three species, Enhalus acoroides, Thalassia hemprichii dan Cymodocea rotundata where found in Sumberkima Beach. Epifauna density in Sumberkima range between 933.33 ind/m3 – 2400.00 ind/m3. Meanwhile, epifauna density in Karang Sewu range between 1311.11 ind/m3 – 2544.44 ind/m3. The epifauna that is mostly encountered is Smaragdia rangiana. Correlation analysis result using the Pearson Product Moment shows a positive correlation between epifauna and seagrass density, r = 0.55, which means that there is enough relation between both variables. The epifauna community has a variety value of 1.60 – 2.19 in Sumberkima, and 1.26 – 2.14 in Karang Sewu, which both count as moderate. The uniformity values 0.74 – 0.96 in Sumberkima and 0.65 – 0.85 in Karang Sewu, which both count as high. Dominance value range from 0.14 – 0.28 in Sumberkima and 0.17 – 0.42 in Karang Sewu, which count as low. Overall, the epifauna community is classified as moderate, where if there is a change in the environment, the community will quickly change too.
INDEKS STRUKTUR KOMUNITAS DAN SAPROBITAS PLANKTON SERTA CHECKLIST KEBERADAAN NEKTON DI PERAIRAN DANAU BERATAN, BALI Gede Surya Indrawan; I Made Sara Wijana; I Made Saka Wijaya; Abd. Rahman As-syakur; I Putu Sugiana; I Made Yunarta
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 16 No 2 (2022)
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/EJES.2022.v16.i02.p10

Abstract

Beratan Lake was mainly popular for tourism and aquaculture activities that affecting water's environmental characteristics. The water healthiness indicator can be seen through the organism's existence, namely plankton to nekton biota that can be uses as an essential parameter in monitoring water conditions. This study aims to determine the plankton community structure index, saprobity index and the presence of nektons in the Beratan Lake. Plankton were sampled using the pouring method while the nekton sample was taken randomly through direct sampling with fishing nets and conducted interviews with the surrounding local community and fishermen. The results of the study found that the abundance of phytoplankton was dominated by Staurastrum with abundance level 1,836.92 ind/L. Meanwhile, the zooplankton was dominated by Rotifera with abundance level 8.17 ind/L. The diversity index, uniformity and dominance of phytoplankton are 1.31, 0.60 and 0.33 respectively, while the saprobity index is 1.08 which classifies the waters of Beratan Lake as being in a lightly polluted condition. There were 18 species of nektons in Beratan Lake were found, with one endemic species Rasbora balinensis and 13 foreign fish. There also an invasive species, namely zebrafish (Amatitlania nigrofasciata) was found in this Lake. From the results of the study, we hope that the government in cooperation with the surrounding community, can control the ecological conditions of the waters of Beratan Lake, especially the presence of invasive species which are increasing in number, as well as protect endemic species. Keywords: Abundance; beratan lake; community structure; plankton; saprobity
Strategi Prioritas Pengembangan Wisata Rumput Laut Berbasis Desa Adat di Pantai Geger, Kelurahan Benoa, Badung, Bali I Putu Aditya Budi Wacika; I Gusti Ngurah Putra Dirgayusa; Gede Surya Indrawan
Journal of Marine and Aquatic Sciences Vol 8 No 1 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i01.p18

Abstract

Community-based tourism management can be used as a reference in tourism development because it provides great opportunities for local communities in all of processes, especially planning, management, monitoring and evaluation. The purpose of this study was to determined the internal and external potential of Geger Beach and to develop strategies for developing seaweed tourism based on traditional villages. Data collection methods consisted of observation, interviews, questionnaires, and literature study. The analysis used in this study were descriptive qualitative analysis and SWOT analysis. Based on the study results, the main strengths of the development of seaweed tourism in Geger Beach is the existence of cooperatives that’s integrated by traditional villages and the main weakness is the supporting facilities still need to be improved. The highest opportunity is the involvement of local communities and the biggest threat is pollution of the aquatic environment due to hotel waste. The priority strategies for developing seaweed tourism in Geger Beach are to raise the role of the pecalang segara immediately in controlling the security and guarding system of Geger Beach, collaboration between the government and traditional villages in implementing policies and regulations that have been made, increasing the role of traditional villages which include local community participation, creates seaweed tourism with its own characteristics from the Peminge Traditional Village, and also creates a master plan to support the successful development of seaweed tourism.
Pemetaan Distribusi Lamun di Selat Ceningan Menggunakan Drone Komersial I Gede Andika Wijantara; I Wayan Gede Astawa Karang; Gede Surya Indrawan
Journal of Marine and Aquatic Sciences Vol 8 No 2 (2022)
Publisher : Fakultas Kelautan dan Perikanan Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/jmas.2022.v08.i02.p12

Abstract

Remote sensing is growing with the drone which can overcome problems and weaknesses on satellite imagery. This research uses mapping techniques on seagrass to the species level using drones that use the high resolution to generate data. The purpose of this study was to determine the distribution species of seagrass in Ceningan Strait using drone. Data is collected at the date of 12 and 13 march 2020 by using 50 cm x 50 cm transect which is done by systematic random sampling, and images capture using drones phantom 3 standard by performing five flights, and the results will be combined into one form of a mosaic. The method used is the classification of GEOBIA (Geographic Object Based Image Analysis) which is validated with field data. From the results of the research conducted, three species were identified using drones, namely seagrass with the species Thalasia hemprichi, Cymodocea rotundata, and Syringodium isoetifolium. The results of the drone image classification showed that the variation in the area of cover of each species with the highest incidence was seagrass with Cymodocea rotundata (2.46 ha), followed by Thalasia hemprichi (1.02 ha), and Syringodium isoetifolium (0.26 ha). The results of the image classification show a fairly good level of accuracy with an accuracy value of 68% and the kappa coefficient with a value of 0.55. From the results obtained, it was concluded that the mapping of seagrass species using drones was categorized as quite good.
Profil Indeks Kesesuaian Wisata di Pantai Semawang, Kelurahan Sanur, Denpasar Berbasis Zonasi Pemanfaatan Kawasan Ida Bagus Putu Adi Gita Saputra; I Gusti Ngurah Putra Dirgayusa; Gede Surya Indrawan
Journal of Marine Research and Technology Vol 6 No 1 (2023): FEBRUARI 2023
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2023.v06.i01.p05

Abstract

The tourism suitability index (IKW) research conducted at Semawang Beach, Sanur Village, Denpasar, aimed to determine the limiting factors, the value of the tourism suitability index, and the zone of the utilization of the coastal tourism area for the recreation category. The method used is observation and survey in the field by purposive sampling at 4 station points, divided into a beach length of 710 m, and tourist interviews with as many as 50 respondents. The data include beach type, water depth, beach width, water base material, water current velocity, coastal slope, water clarity, coastal land cover, hazardous biota, and freshwater availability. The analysis of the tourism suitability index (IKW) refers to the tourism suitability matrix and the classification of the suitability of beach tourism in the recreation category. The limiting factor of the tourism suitability in Semawang Beach is the closure of coastal land. The value of the tourism suitability index (IKW) for beach tourism activities in the recreational category at Semawang Beach at the station I was 96.43%, station II was 90.48%, station III was 96.43%, and station IV was 94.04%. All stations are categorized as suitable (SS) for beach tourism activities. The used zone for coastal tourism areas for swimming, sunbathing, sports, and sightseeing can be carried out at all stations. The sacred zone is at Station II, adjacent to the entrance to the beach
Tingkat Kesejahteraan Nelayan Tradisional di Pantai Bias Lantang Desa Seraya Timur, Kabupaten Karangasem, Bali Luh Putu Diah Ananda Wijayanti; I Wayan Arthana; Gede Surya Indrawan
Journal of Marine Research and Technology Vol 6 No 1 (2023): FEBRUARI 2023
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2023.v06.i01.p07

Abstract

Most of the people living on the coast of Bias Lantang Beach, East Seraya Village, work as fishermen with the main catch being of tongkol. This research conducted to gain an insight about the welfare of traditional fishermen and exchange rate of fishermen (NTN) Coast of Bias Lantang Seraya Timur, Karangasem, Bali using BPS indicator and NTN. The population in this study research are all traditional fishermen that are on the Coast of Bias Lantang Seraya Timur. Sampling of these studies is done using calculations from Slovin analysis. As for the method used in this research is case study method with a descriptive analysis, in which data collection is done using a questionnaire and presented in the form of a chart. The results from the prepared questionnaire's data indicate the level of traditional fishermen's welfare and the NTN that was calculated using a NTN. According to BPS, as known traditional fishermen on Bias Lantang Beach Seraya Timur Village had a high score of welfare rates (high range of score 15-21) with total score 18. Whereas based on the NTN it is known that the value of the traditional fishermen on Bias Lantang Beach Seraya Timur Village is 0.95 while the results of NTN<1 showing that traditional fishermen tend to possess a low welfare rated. As a result, there is a difference between the traditional welfare of fishermen on the Bias Lantang Seraya Timur Village used the BPS indicator and the use of NTN. This is because of the welfare of traditional fishermen using BPS indicator methods such as income, expenses, education, health, place, facilities, and status of ownership, wherefrom the seven indicators four indicators had a high score of indicator (score 3). Whereas NTN consists of two indicators (income and expenses), where the expenses of fishermen are bigger than the income.
Konsentrasi logam berat kadmium, kromium, tembaga, timbal dan seng pada ikan, kerang dan siput laut di Teluk Benoa, Bali Gede Surya Indrawan; I Nyoman Giri Putra; I Putu Sugiana
Jurnal Biologi Udayana Vol 27 No 1 (2023): JURNAL BIOLOGI UDAYANA
Publisher : Program Studi Biologi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JBIOUNUD.2023.v27.i01.p08

Abstract

Biota laut seperti ikan, kerang, dan gastropoda lainnya merupakan sumber makanan bagi manusia. Pada Kawasan Teluk Benoa, nelayan umumnya menangkap biota tersebut dan menjualnya di pasar atau untuk dikonsumsi. Logam berat telah mencemari biota laut di sekitar Teluk Benoa. Logam berat memiliki efek fatal bagi tubuh manusia jika dikonsumsi secara berlebihan. Beberapa logam berat yang berbahaya seperti kadmium (Cd), kromium (Cr), tembaga (Cu), timbal (Pb), dan seng (Zn). Penelitian ini bertujuan untuk mengetahui konsentrasi logam berat Cd, Cr, Cu, Pb, dan Zn pada biota laut di sekitar Teluk Benoa. Sampel ikan, kerang, dan gastropoda diambil secara acak dari nelayan Teluk Benoa. Metode AAS (Atomic Absorption Spectrophotometry) digunakan untuk menentukan konsentrasi logam berat pada setiap objek. Hasil penelitian menunjukkan konsentrasi logam berat yang tinggi pada Scarus Psittacus (ikan kakatua), Acanthurus xanthophores (ikan madah), Marcia hiantina (kerang merah), Anadara antiquata (kerang darah), and Cerithidea sp. (siso/batu-batu). Perbandingan dengan baku mutu FAO (1983), WHO (1989), IAEA-407 (2003), dan SNI-7387 (2009) menunjukkan bahwa biota-biota tersebut telah melebihi baku mutu. Pencemaran logam berat dari sedimen laut di daerah yang sama dan cara makan biota menjadi indikator dari konsentrasi logam berat yang variasi pada biota tersebut.
Studi Potensi Tsunami Bali Utara Menggunakan Metode Numerik Idam Bali Haryono; I Gede Hendrawan; Gede Surya Indrawan
Journal of Marine Research and Technology Vol 6 No 2 (2023): AGUSTUS 2023
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2023.v06.i02.p02

Abstract

Bali Island is one of the most tsunami-prone areas in Indonesia. Two tectonic tsunami sources flank Bali Island: The Megathurst subduction zone in the south and the Back Arc Thurst subduction zone in the north. This study aimed to add information about the tsunami arrival time and the maximum height of the tsunami waves that hit the coast using COMCOT software as a disaster mitigation measure. Five scenarios were used in this study with the differences in the magnitude of tsunami-generating earthquakes. Results showed that the fastest affected shoreline by the tsunami in scenarios 1, 2, and 3 is the Tejakula Sub District shoreline, with a period of 5 minutes 41 seconds to 3 minutes 43 seconds. In scenarios 4 and 5, it was found on the Sawan Sub District shoreline for 2 minutes, 51 seconds to 56 seconds. The maximum run-up of tsunami waves that hit the shoreline in scenarios 1, 2, 3, and 4 are on the Kubu Sub District shoreline with run-up heights of 0.0095 m, 0.47 m, 1.5 m, and 3 m. In scenario 5, the highest run-up is on the Banjar Sub District shoreline, with a 67.6 m run-up height. Based on the results of this study, it can be concluded that the magnitude of the tsunami-generating earthquake greatly influences the travel time and run-up height of the tsunami waves. The greater the magnitude of the tsunami-generating earthquake, the faster the travel time of the tsunami waves and the higher the run-up height.
Penilaian Kondisi Komunitas Mangrove di Kawasan Hutan Mangrove Ciletuh, Sukabumi, Jawa Barat Muhammad Imran Zaelani; I Wayan Arthana; Gede Surya Indrawan
Journal of Marine Research and Technology Vol 6 No 2 (2023): AGUSTUS 2023
Publisher : Department of Marine Sciences, Faculty of Marine and Fisheries, Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JMRT.2023.v06.i02.p07

Abstract

This study aimed to analyze the composition of mangrove vegetation, the Important Value Index (IVI) of mangroves, the condition of the mangrove community (mangrove density and mangrove canopy cover), and environmental parameters as supporting data in the Ciletuh Mangrove Forest Area, Sukabumi, West Java. The research method used in this research is a quantitative descriptive method. The number of stations determined is four; each observation station is made of a plot of 10 x 10 meters, with three plots for each station. The results found seven mangrove species, namely Avicennia marina, Bruguierra cylindrica, Rhizophora apiculata, Rhizophora mucronata, Aegiceras corniculatum, Hibiscus tiliaceus, and Nypa fruticans. The mangrove species found were dominated by A. marina, where this species was found at all stations and had the highest Important Value Index (IVI) value among other species, ranging from 88.96 - 195.55%. Mangrove communities in the Ciletuh Mangrove Forest Area are in good condition referring to the Decree of the Minister of Environment No. 201 of 2004 concerning Standard Criteria and Guidelines for Mangrove Damage with density values ranging from 1533 – 2933 stands/ha and the percentage of mangrove canopy cover ranging from 80.54 - 82.22%.
Co-Authors Abd. Rahman As-syakur Adi Ariyanto Wibisono Adiana, I Nengah Anisa Setyawati Atmaja, Putu Satya Pratama Bertha Ayu Andhira Deny Suhermawan Yusup Devi Ulinuha Dewa Ayu Intan Tirta Sari Dzaki Adilla Razaan Elok Faiqoh Harifah, Zahwa Aulia Nurul I Dewa Nym. Nurweda P., I Gede Andika Wijantara I Gede Hendrawan I Gede Mita Anjas Swara I Gusti Ngurah Putra Dirgayusa I Komang Agus Parnata I Made Saka Wijaya I Made Sara Wijana I Made Sara Wijana I Made Yunarta I Putu Aditya Budi Wacika I Putu Sugiana I Putu Sugiana I Putu Sugiana I Putu Yogi Darmendra I Wayan Arthana I Wayan Arthana I Wayan Eka Dharmawan I Wayan Gede Astawa Karang I Wayan Nuarsa Ida Ayu Manik Damayanti Ida Bagus Putu Adi Gita Saputra Idam Bali Haryono Komang Kartika Indi Swari Luh Putu Diah Ananda Wijayanti M. Rheza Rizki Syahputra Muhammad Imran Zaelani Nadya Treesna Wulansari Ni Wayan Sukma Antari Padmiswari, A.A. Istri Mas Pande Ketut Cahya Krisnanta Arioka Pande Komang Egar Prihandana Purba, Sindi Krisanti Putra, I Nyoman Giri Putra, I Nyoman Giri Putra Putu Angga Wiradana Rahardja, Viryanando Evan Rijal Rahmatullah Sidik, Awalul Rizal Rohman Sutrisna, Putu Gede Viryanando Evan Rahardja Wibisono, Adi Ariyanto Wicaksana, IGA Tresna Wijaya, I Made Saka Yulianto Suteja