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All Journal BULETIN OSEANOGRAFI MARINA Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology International Journal of Science and Engineering (IJSE) Jurnal Ilmu Lingkungan Journal of Marine Research Jurnal Sains dan Teknologi JURNAL ENGGANO JFMR (Journal of Fisheries and Marine Research) Jurnal Sains Teknologi dan Lingkungan (JSTL) Jurnal Biologi Tropis Jurnal Laut Khatulistiwa Jurnal Ilmu Kelautan Kepulauan BIOEDUSAINS: Jurnal Pendidikan Biologi dan Sains Kumawula: Jurnal Pengabdian Kepada Masyarakat Jurnal Abdi Insani Jurnal Inovasi Pendidikan dan Sains Jurnal Teknologi Lingkungan Lahan Basah Ilmu Perikanan Tropis Nusantara Jurnal Pengabdian Pada Masyarakat Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Journal of Fisheries & Marine Jurnal Perikanan
Irwan Ramadhan Ritonga
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Structure of Mangrove Forest and Carbon Sequestration Potential in the Estuarine Region of the Somber River, Balikpapan Bay, Indonesia: A Preliminary Assessment Hamdhani, Hamdhani; Paputungan, Mohammad Sumiran; Ritonga, Irwan Ramadhan; Suyatna, Iwan
Jurnal Ilmiah Perikanan dan Kelautan 2025: IN PRESS ISSUE (JUST ACCEPTED MANUSCRIPT, 2025)
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

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Abstract

Graphical Abstract   Highlight Research Nine mangrove species were identified in the Somber River estuary, dominated by Rhizophora and Avicennia. The mangrove forest exhibited an average density of 1,444 trees/ha, DBH of 13.3 cm, and canopy cover of 62.04%. Litterfall production averaged 9.28 Mg/ha/year, resulting in an estimated carbon sequestration of 47.25 Mg CO₂-eq/ha/year. Carbon sequestration correlated strongly with canopy cover and tree density, but not with DBH, with the midstream segment showing the highest values.   Abstract Mangroves are included in East Kalimantan’s emission reduction programs, but carbon absorption data remain lacking due to limited studies. In Balikpapan Bay, particularly around the Somber River estuary, information on carbon accumulation rates is still limited. This study aimed to document the species composition, tree density, diameter at breast height (DBH), and canopy cover of mangrove forests, estimate their carbon sequestration capacity, and compare sequestration rates across the upstream, midstream, and downstream sections of the Somber River in Balikpapan City, Indonesia. Nine sampling stations were established along the river to represent each segment. At each, mangrove species were identified, tree density and canopy cover measured, and litterfall collected. Carbon sequestration was then estimated from litterfall-based Net Primary Productivity (NPP). Nine species were recorded, dominated by Rhizophora and Avicennia. The forest averaged 1,444 trees/ha, DBH of 13.3 cm, and 62.04% canopy cover. Midstream sites showed the highest density (1,533 trees/ha) and canopy cover (65.7%), though not in DBH. Litterfall averaged 9.28 Mg/ha/year (0.58–18.76), corresponding to 47.25 Mg CO₂-eq/ha/year, peaking midstream. Sequestration rates did not differ significantly among segments but correlated strongly with canopy cover, density, and DBH. This study provides initial estimates of mangrove carbon uptake in the Somber River estuary near the Kariangau industrial area, offering insights for management strategies to enhance blue carbon storage, provides externally relevant estimates and a structure-to-sequestration linkage that can guide restoration targets, carbon accounting, and coastal policy in working estuaries. Further research should quantify sediment carbon accumulation and consider species-specific differences to better inform restoration efforts.
Types of mesoplastic waste in the Manggar Beach tourism area, Balikpapan City, East Kalimantan Rifanka, Muhammad Akbar; Ritonga, Irwan Ramadhan; Eryati, Ristiana
Jurnal Ilmu Perikanan Tropis Nusantara (Nusantara Tropical Fisheries Science Journal) Vol. 4 No. 2 (2025): Nusantara Tropical Fisheries Science
Publisher : Faculty of Fisheries and Marine Science, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/de3a7122

Abstract

Plastic waste poses a significant threat to the global environment, particularly in coastal and marine ecosystems. Among its various forms, mesoplastics, measuring between 5 and 25 mm have attracted considerable attention. This study aims to identify and analyze the types, weights, quantities, compositions, and densities of mesoplastics found along Manggar Beach, a tourist destination in Balikpapan City, East Kalimantan. Sampling was conducted in two periods: April (Period I) and August (Period II) of 2022. A purposive sampling method was applied using a 100-meter transect line divided into 5x5 meter lanes, followed by the placement of 1x1 meter quadrats. In Period I, four types of mesoplastics were identified as film, fiber, fragments, and styrofoam, while only film was detected in Period II. A total of 43 mesoplastic particles (weighing 9.45 grams) were recorded in Period I, compared to just 5 particles (0.15 grams) in Period II. By weight, styrofoam made up the largest proportion (49%) in Period I, whereas film accounted for 100% in Period II. The average mesoplastic density observed in this study was 0.38 particles per square meter.
PENANAMAN BIBIT BAKAU DI KAWASAN WISATA MANGROVE TELOK BANGKO, KOTA BONTANG Ritonga, Irwan Ramadhan; Eryati, Ristiana; Paputungan, Mohammad Sumiran; Suyatna, Iwan; Kusumaningrum, Widya; Adnan, Adnan; Nurfadilah, Nurfadilah; Suryana, Irma; Budiarsa, Anugrah Aditya; Bulan, Dewi Embong
Kumawula: Jurnal Pengabdian Kepada Masyarakat Vol 8, No 3 (2025): Kumawula: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/kumawula.v8i3.61250

Abstract

Mangrove (bakau) is one of the coastal plants that might function socially, ecologically and economically. One of the coastal areas of East Kalimantan that has experienced damage due to human activities is in Bontang City, specifically Telok Bangko. Therefore, planting bakau seedlings is one of the efforts to maintain the bakau ecosystem in the coastal areas of Bontang City. The purpose of this community service activity is to increase knowledge and understanding of the importance of mangrove in coastal areas by planting mangrove seedlings. This community service activity was carried out on September 29, 2024 in the Telok Bangko mangrove tourism area, Bontang City. The method used in this activity was lecture and followed by direct practice in the field. The results of this activity were 500 mangrove seedlings (Rizophora mucronata) were planted at the location of the activity by students and academics of Mulawarman University. The results of this activity could increase knowledge and understanding for each participant in determining the right planting location, type, how to plant mangroves and evaluate activities. This activity is also expected to benefit the community both economically and ecologically in the Telok Bangko mangrove area. The process of evaluating activities must be carried out to support the success of this activity, such as maintenance, periodic data collection (monitoring) of mangrove seedlings (% survival rate) that have been planted by participants.Mangrove (bakau) merupakan salah satu tumbuhan pesisir yang dapat berfungsi secara sosial, ekologi dan ekonomi. Salah satu kawasan pesisir Kalimantan Timur yang  telah mengalami kerusakan akibat aktivitas manusia terdapat di Kota Bontang, khususnya Telok Bangko. Karenanya, menanam bibit bakau merupakan salah satu usaha untuk mempertahankan ekosistem bakau di wilayah pesisir kota Bontang. Tujuan dari kegiatan ini adalah untuk meningkatkan pengetahuan dan pemahaman tentang pentingnya bakau di wilayah pesisir dengan cara menanam bibit bakau. Kegiatan pengabdian masyarakat ini dilakukan pada tanggal 29 September 2024 di kawasan wisata mangrove Telok Bangko, Kota Bontang. Metode ceramah dan praktek langsung merupakan metode yang dilakukan di kegiatan pengabdian masyarakat ini. Hasil kegiatan yang didapatkan dari kegiatan ini adalah bibit bakau (Rizophora mucronata) telah ditanam sebanyak 500 bibit di lokasi kegiatan oleh para siswa dan akademisi Universitas Mulawarman. Hasil kegiatan ini dapat meningkatkan pengetahuan dan pemahaman kepada setiap  peserta dalam penentuan lokasi penanaman, jenis, cara menanam bakau dan evaluasi kegiatan secara tepat. Kegiatan ini juga diharapkan dapat bermanfaat bagi masyarakat baik secara ekonomi dan ekologi di kawasan mangrove Telok Bangko. Proses evaluasi kegiatan harus dilakukan untuk mendukung keberhasilan dari kegiatan ini, seperti pemeliharaan, pendataan berkala (monitoring) bibit bakau yang hidup (% survival rate) yang telah ditanam oleh peserta kegiatan.
DETEKSI FORMALIN PADA IKAN DAN SEAFOOD ASIN DARI BEBERAPA PASAR LOKAL DI KOTA SAMARINDA, KALIMANTAN TIMUR Irwan Ramadhan Ritonga; Ristiana Eryati; Akhmad Rafii
Jurnal Inovasi Pendidikan dan Sains Vol 3 No 3 (2022): December
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Nahdlatul Wathan Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51673/jips.v3i3.1181

Abstract

Formalin is a chemical compound that is often added to fish and seafood. When formalin exposure enters the human body, it is very dangerous for human health. The purpose of this study was to detect the formalin content in fish and seafood samples from several local markets in the city of Samarinda. The research method was descriptive observational on 149 test samples of fish and seafood salted. Detection of formalin content in fish and seafood was detected by the rapid test kit. When the test sample changed to red and purple color, the sample was indicated to be positive for formalin. It was found that 10 out of 13 fish samples and 4 out of 4 seafood samples were positive for formaldehyde. The types of fish and seafood containing formalin in this study were layang, sarden, teri, baronang, pedak, haruan laut, kepala batu, kaca-kaca, tenggiri, hiu, cumi, udang ebi, udang papay and baby cumi. This study suggests that consumers should be more careful to buy fish and seafood that contain formaldehyde.
PENINGKATKAN PEMAHAMAN DAN NILAI MAHASISWA DENGAN METODE PRAKTIKUM Irwan Ramadhan Ritonga; Dewi Embong Bulan; Mohammad Sumiran Paputungan; Nurfadilah Nurfadilah; Irma Suryana; Adnan Adnan; Iwan Suyatna; Ristiana Eryati; Widya Kusumaningrum; Rani Novia; Ahmad Ahmad; Firman Firman; Andi Fitri Sakmiana
Jurnal Inovasi Pendidikan dan Sains Vol 4 No 2 (2023): August
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Nahdlatul Wathan Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51673/jips.v4i2.1519

Abstract

Education is one indicator of a country's progress, because it has improved the quality of human resources. One of the Educational activities in the university is joint practicums to improve students' understanding of critical thinking patterns and values. The purpose of this practicum was to examine and analyze the ability of essential patterns of thinking, level of understanding of theory and method, and student learning outcomes as well in the study programme of Marine Science, Mulawarman University. Practicum activities were conducted in Malahing village, Bontang City in November 2022. A total of 52 students took part in the activities. All data in this activity were collected from initial critical thinking skills tests (pre-test) and after (post-test), score from practicum’s report, and participants' perceptual responses in the form of online questionnaires. It was found that the student's critical thinking skills in this activity were in the moderate category based on N-Gains score (0,46). In General, the percentage of understanding and student learning outcomes was in good category (71-84). Based on the student responses, about 92.3% of students were enthusiastic and happy with the practicum learning method. Thus, joint practicum activities might influence increasing student understanding and grades.
Co-Authors Adnan . Adnan Adnan Adnan Adnan Agathajani, Brigitha Anjeli Ahmad Ahmad Ahmad Ahmad Ahmad Ahmad Akbar, Rizali Akhmad Rafii Alimin, M Andi Fitri Sakmiana Andini, Ardita Dwisepti Anindia Resty Syafira Antazilla Rindyani Anugrah Aditya Budiarsa, Anugrah Aprilia, Dita Apriliyani, Vivi Arwadi, Mohammad Tri Arwadi, Tri Ashar, Andini Aulia Ayuk Ayla Nursari Boedi Hendrarto Brigitha Anjely Agatha Jani Bulan, Dewi Embong Clara Frecilia Patiung Dewi Embong Bulan Dharma Saputra, Dharma Dharmawan, I Wayan Eka Elisar Elisar Elisar, Elisar Eryati, Ristiana Fadhila Nurhayati Fahrurozi, Zidhan Muhammad Firman , Firman Firman Firman Hamdhani Hamdhani Hamdhani, Hamdhani Intan Sari Dewi Irma Suryana Irma Suryana Irma Suryana Irma Suryana Iwan - Suyatna Iwan Suyatna Iwan Suyatna Jani, Brigitha Anjely Agatha Khoirunnisa, Nanda Kusumaningrum, Widya Loto, Naomi Main, Aminullah Aminul Manukrante, Alvionita Muchlis Effendi Muthy, Najla Adellia Novia, Rani Nur Hasanah Nurdiansah, Doni Nurfadilah Nurfadilah Nurfadilah Nurfadilah Nurfadilah Nurfadilah Paputungan, Mohammad Sumiran Rafi’i, Ahmad Rafi’i, Ahmad Rani Novia Rani Novia Renyaan , Jeverson Rifanka, Muhammad Akbar Ristiana Eryati Ristiana Eryati Ristiana Eryati Ristiana Eryati Ristiana Eryati Ristiana Eryati S. Supriharyono Saputra, Muhammad Ikhsan Silviana Silviana Simanihuruk, Dorsen Hotma Tua Soenarih, Asih Suryana, Irma Susi Rahmawati Suyatna , Iwan Tobing, Binto Iskandar Hasibuan Widya Kusumaningrum Widya Kusumaningrum