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All Journal Ecotrophic, Journal of Environmental Science Jurnal Akuatika Indonesia INTERNATIONAL JOURNAL OF ENVIRONMENT AND GEOSCIENCES
I Wayan Arthana
Program Studi Manajemen Sumberdaya Perairan, Fakultas Perikanan dan Ilmu Kelautan, Universitas Udayana. Jl. Kampus Bukit Jimbaran 80361, Bali
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Energy Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering

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Assessing lake shoreline change and prediction for 2030 by physical drivers: A Case Study from Lake Batur, Batur UNESCO Global Geopark, Bali Utama, I Putu Wira; Arthana, I Wayan; Nuarsa, I Wayan
International Journal of Environment and Geosciences Vol 5 No 1 (2024): International Journal of Environment and Geosciences
Publisher : Graduate Study of Environmental Sciences, Postgraduate Program of Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ijeg.2024.v05.i01.p02

Abstract

Over ten years, the water level of Lake Batur has increased. Agriculture area and settlements around Lake Batur are threatened by rising water level. This study aims to analyze the shoreline change of Lake Batur, located in the Batur UNESCO Global Geopark (BUGG), during the period of 2007 – 2018 and design a prediction for 2030. Understanding the shoreline change is very important for lake management and planning. Shoreline changes were analyzed in Geographic Information System (GIS) application. The data were obtained based on Remote Sensing (RS) data, Landsat ETM+ imagery on September 24, 2007, and Landsat OLI imagery on October 24th, 2018. Predictions of lake shoreline in 2030 result from modelling by integrating ASTER-GDEM V2 data, lake water level data for 2007–2018, annual average rainfall data for 2007–2018, and bathymetry data for 2013 and 2015. The results of the satellite imagery analysis show that there has been a change in the length of the shoreline, which has increased from 20.47 km in 2007 to 21.28 km (3.96%) in 2018. The lake surface area changed from 15.34 km2 in 2007 to 16.16 km2 in 2018 (5.35%). The prediction of lake shoreline changes in 2030 showed that Lake Batur will increase to 26.90 km (26.41%), and lake surface area is predicted to increase by 17.67 km2 (9.34%) from 2018. This is because of the morphological change of Lake Bottom.
IDENTIFIKASI MAKROZOOBENTOS SEBAGAI BIOINDIKATOR KUALITAS PERAIRAN DI PANTAI TELUK BENOA, BADUNG Sutrisnawati, Eka Ari; Arthana, I Wayan; Windia Adnyana, Ida Bagus
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 17 No 2 (2023)
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.2023.v17.i02.p05

Abstract

Utilization of coastal waters for aquaculture activities or for other activities provides positive value for human welfare but can also provide the potential for reducing water quality. The decline in environmental quality can be seen from changes in components such as biology, chemistry, and beach physics. Changes in chemical and physical components cause sediment to decrease, which will affect the life of marine biotas, such as the community structure, especially the slow-moving and relatively settled biota on the bottom of the waters (macrozoobenthos). Macrozoobenthos are very appropriate to be used as an indicator of changes in water quality due to their benthic nature which is relatively silent or has low mobility so it is strongly influenced by the environment. The purpose of the study was to determine the structure of the macrozoobenthos community and the condition of seawater quality. There were 25 species of gastropods and 3 other classes. The macrozoobenthos species diversity index on the Benoa Bay Coast showed a moderate level of diversity with the highest value of 2.4576. The uniformity index at each station ranges from 0.0894 – 0.5337. The value of the dominance index ranges between 0.000004-0.7656. Based on the relative abundance, the macrobenthos community is dominated by the Gastropod class. The temperature values ??at each station were relatively the same, ranging from 29.3°C– 30.8°C, and the pH was in accordance with quality standards for macrozoobenthos growth. Some indicators of water quality are still below the quality standard threshold, but the concentration of phosphate (PO4) at all locations is already above the predetermined quality standard of 0.015 mg/L?. Keyword: Macrozoobenthos; Bioindicator; Benoa Bay; Bali
BIOMASSA DAN SIMPANAN KARBON PADA EKOSISTEM PADANG LAMUN DI WILAYAH NUSA LEMBONGAN Dwikasari, Ida Ayu Indira; Arthana, I Wayan; Watiniasih, Ni Luh
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 18 No 1 (2024)
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.2024.v18.i01.p05

Abstract

The Seagrass ecosystem is one of the important ecosystems in the ocean in mitigating global warming. This research aims to examine the potential for storing carbon stocks in seagrass biomass. The purposive sampling method was used at three location points. At each location, there are 9 quadrants for a total of 27 quadrants. The types of seagrass found were Thalassia hemprichii, Cymodocea rotundata, Enhalus acoroides, Halodule uninervis, Halophila ovalis, Halodule pinifolia with moderate diversity and moderate community stability. Seagrass conditions are relatively protected between the coast and coral reefs with the highest average density of 225 ind/m2. The type of seagrass with the highest density is Thalassia hemprichii. The types of substrates are sand, coral rubble, and sandy mud. The carbon stock in the Lembongan Beach area has an area of ??89.46 hectares of seagrass beds. Around 56.32% or 3,21 tons of carbon were stored as the bottom carbon stock of the substrate and 43.67% or 2,49 tons of carbon were stored as the top carbon stock of the substrate. Keywords: Thalassia Hemprichii, Seagrass, Substate, Global Warming
MODEL SISTEM DINAMIK UNTUK KEBERLANJUTAN DANAU BATUR, BATUR UNESCO GLOBAL GEOPARK, BALI Utama, I Putu Wira; Arthana, I Wayan; Nuarsa, I Wayan; Suryawan Wiranatha, Agung
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 18 No 1 (2024)
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.2024.v18.i01.p01

Abstract

This research aims to analyze the best scenario for conserving Lake Batur, Batur UNESCO Global Geopark (BUGG), Bali. Using the system dynamics method, key factors in the management of Lake Batur can be identified. Based on modeling results, it is known that the sustainability of Lake Batur is strongly influenced by aspects of land use, the environment, the economy, and the social culture of the community. The main leverage factors in supporting the preservation of Lake Batur are law enforcement and supervision, government assistance, as well as training and outreach to the community. The analysis of the sensitivity value of the optimistic/moderate ratio shows that the optimistic scenario is the best option to reduce the lake pollution index to 0.86 (still below the 1 threshold). Increasing community income per capita in this area in 2045 is estimated to reach Rp87.992.747,76/year, with predictions of 9,312 floating net cage plots owned by 2,592 entrepreneurs. The predicted number of plots is 14.90 ha, which is still below 1% of the area of Lake Batur. Keywords: System Dynamics; Sustainability; Lake Batur; BUGG
KELIMPAHAN MAKRO DEBRIS DI EKOSISTEM MANGROVE MUARA TUKAD MATI, BALI Julihartadi, I Gede Dwian; Arthana, I Wayan; Ernawati, Ni Made
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 18 No 1 (2024)
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.2024.v18.i01.p11

Abstract

Macro debris refers to waste materials ranging in size from 2.5 cm to 1 m, commonly found both on the water's surface and on the seabed. The accumulation of such large debris in coastal and marine environments can lead to various consequences, including disturbances to ecosystem stability and threats to the survival of organisms. Additionally, it diminishes the aesthetic quality of the environment. Among the ecosystems most susceptible to becoming repositories for this waste is the mangrove ecosystem. This study aims to quantify the amount, types, and abundance of macro debris scattered in the Tukad Mati Estuary Mangrove Area, Badung Regency, Bali. The research methodology involved several steps, starting with the selection of research stations. Transects measuring 5 x 5 meters were established. Within these designated areas, samples of macro debris were collected and categorized according to their composition, including materials such as plastic, fabric, glass, metal, and rubber. The results revealed that the total mass of macro debris collected in the Tukad Mati Estuary area amounted to 42,630 grams. The types of macro debris found in the Tukad Mati Estuary mangrove ecosystem consist of plastic, fabric, glass, metal, and rubber. Based on their quantity, the composition of macro debris is dominated by plastic at 87.02%, followed by fabric at 4.24%, rubber at 4.17%, glass at 2.67%, and metal being the least at 1.89%. Based on their weight, the composition of macro debris is highest for plastic at 32.33%, followed by rubber at 27.29%, fabric at 20.23%, glass at 14.36%, and metal being the lowest at 5.78%. The abundance of macro debris in the Tukad Mati Estuary mangrove ecosystem ranges from 0.85 items/m² to 10.68 items/m². Keywords: Marine Debris; Pollution; Tukad Mati Estuary; Mangrove
Aspek Ekologi dan Sosial Budaya untuk Keberlanjutan Usaha Budidaya Rumput Laut di Nusa Lembongan Manurung, Elina; Arthana, I Wayan; Kumbara, A A Ngurah Anom
Akuatika Indonesia Vol 9, No 2 (2024): Jurnal Akuatika Indonesia (JAkI)
Publisher : Direktorat Sumber Daya Akademik dan Perpustakaan Universitas Padjadjaran, Grha. Kandaga (P

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/jaki.v9i2.46687

Abstract

Nusa Lembongan merupakan salah satu sentra penghasil rumput laut, namun padatahun 2017 produksinya mengalami penurunan sebesar akibat penyakit ice-ice, bibit yang kurang baik, harga jual rendah, dan peralihan profesi petani ke pariwisata. Selama pariwisata di Pulau Bali menurun akibat pandemi Covid-19,masyarakat kembali menggeluti budidaya rumput laut sebagai mata pencarian.. Penelitian ini bertujuan untuk melihat keterkaitan aspek ekologi dan sosial budaya usaha rumput laut agar berkelanjutan. Penelitian dilakukan di Nusa Lembongan, Kawasan Konservasi Perairan (KKP) Nusa Penida, Provinsi Bali, dengan metode kuantitatif dan kualitatif. Data yang diamati adalah laju pertumbuhan dan parameter kualitas air yaitu suhu, pH, salinitas, oksigen terlarut, kedalaman dan kecepatan arus serta data sosial budaya melalui wawancara dan observasi. Penelitian dimulai November 2022-Januari 2023. Hasil yang didapat rata-rata laju pertumbuhan mutlak rumput laut tertinggi  173 gram dan yang terendah sebesar 106 gram, produksi rumput laut tertinggi sebesar 1.376 gr/m dan rata-rata laju pertumbuhan harian spesifik berkisar antara 1,98-4,53% perhari. Parameter kualitas air suhu sebesar 29-31,4 °C; untuk pH 7,5-8,3; salinitas berkisar 29-31,5 ppt - oksigen terlarut 6,47-7,45 mg/L; kedalaman 0,2-0,9 m; dan kecepatan arus 0,1-0,3 m/s. Responden 20 orang pelaku pembudidaya, pendapatan dalam 1 kali budidaya berkisar antara Rp 5.000.000,00–15.000.000,00. Perairan Nusa Lembongan secara ekologi memenuhi syarat untuk usaha budidaya rumput laut berkelanjutan sebagai mata pencarian utama masyarakat Nusa Lembongan, dengan kearifan lokal Nyepi Segara. Budidaya rumput laut di Nusa Lembongan merupakan warisan budaya dan tradisi yang diwariskan dari satu generasi ke generasi dari tahap persiapan lokasi, penanaman, perawatan dan panen.
Co-Authors Dwi Puspa Arini Dwikasari, Ida Ayu Indira Gde Raka Angga Kartika I Wayan Nuarsa Ida Bagus Windia Adnyana Julihartadi, I Gede Dwian Krisnati Dewi, Ni Putu Ayustin Kumbara, A A Ngurah Anom Manurung, Elina Ni Luh Watiniasih Ni Made Ernawati, Ni Made Suryawan Wiranatha, Agung Sutrisnawati, Eka Ari Takahiro Osawa Utama, I Putu Wira