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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 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 Jurnal Ilmiah Sains 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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ANALYSIS OF Fe, Mn, AND Zn CONCENTRATIONS IN MANGROVE SEDIMENTS ALONG THE SOMBER RIVER IN BALIKPAPAN CITY Ashar, Andini Aulia Ayuk; Paputungan, Mohammad Sumiran; Hamdhani, Hamdhani; Ritonga, Irwan Ramadhan
Jurnal Perikanan Unram Vol 15 No 1 (2025): JURNAL PERIKANAN
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jp.v15i1.1408

Abstract

Somber River is one of the rivers with mangrove ecosystem in Balikpapan city. The high human activity in Somber River area may produce waste and heavy metal pollution in mangrove ecosystem, especially in sediment. The purpose of this study is to determine the concentration of Fe, Mn and Zn in mangrove sediments. In addition, the values of pollution indices such as contamination level (TK), pollution load index (IBP) and geoaccumulation index (I-Geo) in sediments are also determined along Somber river, Balikpapan city. The research method used in this study is purposive sampling. Sediment samples were taken from 9 sampling points along Somber river. Sediment samples were deconstructed using acid and analyzed using the Atomic Absorption Spectrophotometer (AAS) Aurora AI 1200 to determine the concentration of Fe, Mn, and Zn based on dry weight in µg/g. Based on the analysis, it was found that the Fe concentration in the sediment ranged from 5403 to 12268 µg/g with an average of 9462 ± 2294 µg/g. In Mn, the concentration value was between 2,25 and 23,2 µg/g with an average of 11,4 ± 7,43 µg/g. Then, the Zn concentration was between 16,6 and 61,3 µg/g, with an average of 43,4 ± 17,4 µg/g. The varying concentrations of Fe, Mn and Zn might be related to several human activities, such as industrial activities, boat docks, settlements, fisheries, ports and metal distribution from the Somber river. The concentrations of Mn and Fe at all research stations were lower than the sediment quality standards, except for Fe. The level of Fe, Mn and Zn contamination in sediments was low (TK<1) and not polluted (IBP<1) and the geoaccumulation index (I-geo) was not polluted to polluted (0<I-geo<1).
Estimasi Stok Karbon Sedimen pada Padang Lamun di Pulau Kedumpit, Teluk Balikpapan Provinsi Kalimantan Timur: Estimation of Seagrass Sediment Carbon Stock in Kedumpit Island, Balikpapan Bay, East Kalimantan Province Hasanah, Nur; Paputungan, Mohammad Sumiran; Ritonga, Irwan Ramadhan; Rahmawati, Susi; Dharmawan, I Wayan Eka; Renyaan , Jeverson; Nurdiansah, Doni
JFMR (Journal of Fisheries and Marine Research) Vol. 9 No. 1 (2025): JFMR on March
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2025.009.01.11

Abstract

Investigasi terhadap kondisi lamun di perairan Teluk Balikpapan telah dilakukan, namun perhitungan stok karbon di sedimen lamun yang berada di perairan estuari tersebut belum tersedia. Penelitian ini bertujuan untuk mengestimasi cadangan karbon pada sedimen lamun di Pulau Kedumpit yang berlokasi di Teluk Balikpapan, Kalimantan Timur. Masing-masing sampel sedimen diambil pada 3 titik stasiun yang berbeda, dengan titik stasiun (0, 50 dan, 100 meter) dari daerah lamun yang dekat dengan dataran menuju ke arah laut. Pengambilan sampel sedimen menggunakan pipa PVC berdiameter 2,5 inch dengan kedalaman sampel 0 – 50 cm dan dipotong dengan interval 5 cm. Kandungan karbon organik dianalisis dengan metode Loss on Ignition (LoI). Hasil studi menemukan terdapat dua jenis lamun yaitu Halodule sp. dan Halophila sp. Berdasarkan visualisasi sampel sedimen bahwa jenis substrat di lokasi penelitian cenderung pasir berlumpur. Konsentrasi karbon organik sedimen pada tiga stasiun berkisar antara 0,34-2,64% dengan rata-rata 1,24±0,37 %. Nilai stok karbon sedimen per lapisan sedimen berkisar 63 hingga 114 MgC/ha dan rata-rata total simpanan karbon sebesar 95±27,6 MgC/ha pada kedalaman sedimen 0-50 cm. Terdapat perbedaan yang signifikan pada nilai bulk density, karbon organik sedimen, dan stok karbon dalam sedimen (p-value < 0,05) antar stasiun dan kedalaman.   Seagrass in Balikpapan Bay estuary already investigated, however its carbon stock have not been measured. The objective of this study was to estimate the carbon stock in seagrass sediments in Kedumpit Island, located in Balikpapan Bay estuary. Each sediment sample was taken at 3 different sites (0, 50 and 100 meters) from the seagrass area near to the land towards the sea. Sediment samples were taken using a 2.5 inch diameter PVC core with a depth of 0 - 50 cm and were sliced at 5 cm interval. Organic carbon content was analysed using the Loss On Ignition (LOI) method. Study results showed that two seagrass species were found in the study site, such as Halodule sp and Halophila sp. Based on visual observation at sediment samples, the substrate type in the study site tends to be muddy sand. Sediment organic carbon concentration at three stations ranged from 0.34-2.64%, with average at 1,24±0,37%%. Sediment carbon stock values of sediment layers ranged from 63 to 114 MgC/ha and the total average carbon storage was 95±27,6 MgC/ha. The value of bulk density, sediment organic carbon, and carbon stock in sediment were significantly different (p-value < 0.05) between the sites and the depth of sediment layers.
Pengenalan dan Pelatihan Pengambilan Foto Udara Menggunakan Drone DJI Matrice 350 RTK Ritonga, Irwan Ramadhan; Budiarsa, Anugrah Aditya; Hamdhani, Hamdhani; Khoirunnisa, Nanda
Jurnal Pengabdian Pada Masyarakat Vol 10 No 1 (2025): Jurnal Pengabdian Pada Masyarakat
Publisher : Universitas Mathla'ul Anwar Banten

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30653/jppm.v10i1.1131

Abstract

Drone merupakan instrumen penerbangan tanpa awak yang digunakan manusia untuk kegiatan survei lingkungan seperti pertanian, pesisir dan laut, dan mitigasi bencana. Salah satu jenis drone yang memiliki terobosan terbaru untuk survei lingkungan adalah drone DJI Matrice 350 RTK. Tujuan kegiatan pengabdian masyarakat ini adalah untuk memperkenalkan dan melatih pengambilan foto udara dengan menggunakan drone DJI M350 RTK. Kegiatan ini dilakukan di Integrated Laboratory (I-Lab) Universitas Mulawarman pada tanggal 22 Agustus 2024. Peserta kegiatan ini berasal dari latar belakang yang berbeda, seperti akademisi, mahasiswa dan masyarakat yang berprofesi sebagai wiraswasta. Kegiatan dilakukan dengan beberapa tahapan seperti pembukaan, presentasi, diskusi, praktek terbang, pengambilan foto udara, penggabungan gambar, dan evaluasi kegiatan. Tingkat keberhasilan kegiatan ini diukur dengan melakukan pre-test dan post-test pada setiap peserta. Kegiatan pengenalan dan pelatihan pengambilan foto udara dikegiatan ini belangsung dengan baik dan lancar. Sekitar 90,3% para peserta berhasil mengikuti kegiatan ini terutama dalam mengoperasikan drone dan mengolah data hasil pengambilan foto udara. Sebagian besar peserta sangat puas (81,0%) dengan dilakukannya kegiatan pengabdian masyarakat ini. Drones are unmanned flight instruments used by humans for environmental survey activities such as agriculture, coastal and marine, and disaster mitigation. One type of drone that has the latest breakthrough for environmental surveys is the DJI Matrice 350 RTK drone. The objectives of this community service activity are to introduce and train aerial photography using the DJI Matrice 350 RTK drone. This activity was carried out at the Integrated Laboratory (I-Lab) of Mulawarman University on 22 August 2024. The participants of this activity came from different backgrounds, such as academics, students and people who work as entrepreneurs. The activity was carried out with several stages such as opening, presentation, discussion, practice flying, taking aerial photos, merging images, and evaluating activities. The success rate of this activity was measured by conducting a pre-test and post-test on each participant. The introduction and training of aerial photography in this activity went well and smoothly. Approximately 90.3% of the participants successfully participated in this activity, especially using drones and processing data from aerial photography. The majority of participants were very satisfied (81.0%) with this community service activity.
COMPARISON OF MACROZOOBENTHOS ABUNDANCE BETWEEN COASTAL AND MANGROVE AREAS OF TANJUNG LIMAU KUTAI KARTANEGARA DISTRICT Simanihuruk, Dorsen Hotma Tua; Paputungan, Mohammad Sumiran; Ritonga, Irwan Ramadhan
Jurnal Perikanan Unram Vol 15 No 3 (2025): JURNAL PERIKANAN
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jp.v15i3.1508

Abstract

Macrozoobenthos have played an important role in coastal ecosystems, especially in beaches and mangrove areas, as indicators of environmental health and as important components of the food chain. However, the presence of human activities such as industrial waste, households, fisheries and agriculture could affect the abundance of macrozoobenthos in coastal areas. The purpose of this study was to assess and analyze the type, abundance, diversity, uniformity and dominance of macrozoobenthos and sediment substrate conditions in the beach and mangrove areas in Tanjung Limau village, Kutai Kartanegara Regency. This research was conducted from December to March 2024. This research method uses descriptive methods with sampling techniques using purposive random sampling. Macrozobenthos sampling sites were divided into 2 (two) stations. Station 1 was located at beach area, while station 2 was located in the mangrove ecosystem area. The results showed that the abundance of macrozoobenthos in the mangrove area (13 species) was higher compared to the beach (18 species), with groups of snails and bivalves. Abundance at station 1 (43.3 ind/m²) was lower than at station 2 (58.0 ind/m²). The diversity index value at station 1 (2.16) and station 2 (2.57) was classified as moderate. Uniformity at stations 1 and 2 was 0.84 and 0.87 (high category), respectively. Then the dominance index values found at stations 1 and 2 were 0.17 and 0.10 (non-dominant category), respectively. The sediment texture in the coastal area of Tanjung Limau at both stations 1 and 2 is a clayey loam, which is one of the main causes of the differences in macrozoobenthos abundance.
Perbandingan Stok Karbon pada Dua Genus Mangrove Berbeda (Avicennia dan Rhizophora) di Estuari Sungai Somber, Teluk Balikpapan: Comparison of Carbon Stocks from Two Different Mangrove Genus (Avicennia and Rhizophora) in the Somber River Estuary, Balikpapan Bay Paputungan, Mohammad Sumiran; Ritonga, Irwan Ramadhan; Loto, Naomi; Suryana, Irma; Dharmawan, I Wayan Eka
JFMR (Journal of Fisheries and Marine Research) Vol. 9 No. 2 (2025): JFMR on July
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2025.009.02.8

Abstract

Informasi stok karbon di ekosistem mangrove yang berada di area Teluk Balikpapan masih sedikit, termasuk perbandingan stok karbon pada genus mangrove yang berbeda. Penelitian ini bertujuan untuk membandingkan stok karbon pada dua genus mangrove yang tumbuh di sekitar perairan estuari Sungai Somber di Teluk Balikpapan. Lokasi pengambilan data dibagi menjadi dua yaitu Zona Rhizophora dan Zona Avicennia. Pengambilan data diameter batang pohon pada ketinggian dada dan sampel sedimen sedalam 1-meter dilakukan di tahun 2022. Data diameter batang pohon digunakan untuk menghitung stok karbon pada pohon menggunakan persamaan alometrik biomassa yang tersedia. Sampel sedimen digunakan untuk mengukur jumlah karbon yang tersimpan di sedimen dengan menggunakan metode loss on ignition. Hasil penelitian menunjukkan total stok karbon pada Zona Rhizophora lebih besar dibandingkan Zona Avicennia. Konsentrasi karbon organik di sedimen yang tinggi ditemukan di Zona Rhizophora yang kemudian menyebabkan jumlah karbon yang tersimpan di sedimen Zona Rhizophora 2 kali lipat lebih besar dibandingkan karbon yang tersimpan di sedimen Zona Avicennia. Namun, stok karbon di biomassa pohon mangrove terbesar ditemukan berada di Zona Avicennia yang lebih banyak memiliki ukuran pohon berdiameter besar. Hasil ini mengindikasikan adanya variasi stok karbon di ekosistem mangrove yang terdapat di estuari Sungai Somber berdasarkan genus yang mendominasi.   Current information on carbon stock in mangrove ecosystem growing in the Balikpapan Bay area remains limited, including comparison of the carbon stock based on different mangrove genera. This study aimed to compare carbon stocks between two mangrove genera growing in the estuarine area of Somber River, Balikpapan Bay. The sampling location were divided based on the dominant mangrove genera, namely Rhizophora Zone and Avicennia Zone. Diameter at breast height (DBH) of mangrove trees and 1-meter vertical sediment samples were collected in 2022. The DBH data were used to estimate carbon stock in live-tree biomass using available allometric equations for mangrove. Sediment samples were used to determine carbon stock in the sediment by using the loss on ignition method. The results showed that total carbon stock in the Rhizophora Zone is larger than in the Avicennia Zone. Higher organic carbon concentration in sediment was found in the Rhizophora Zone, resulting in its sediment carbon stock being twice as high as that in the Avicennia Zone. However, carbon stock in the live-tree biomass was greater in the Avicennia Zone where more trees with larger diameters were found. The finding suggests that total carbon stock varies depending on the dominant mangrove genera in the Somber River Estuarine Ecosystem.
PERBANDINGAN KELIMPAHAN PLANKTON DAN MIKROPLASTIK DI PERAIRAN MANGGAR KOTA BALIKPAPAN Ritonga, Irwan Ramadhan; Eryati, Ristiana; Manukrante, Alvionita; Muthy, Najla Adellia
Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Vol 21, No 2 (2025): SAINTEK PERIKANAN
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijfst.21.2.88-96

Abstract

Plankton merupakan salah satu produsen primer di perairan Manggar, Balikpapan. Plankton dapat digunakan sebagai salah satu indikator pencemaran perairan akibat aktifitas manusia, salah satunya mikroplastik. Namun, informasi tentang perbandingan antara kelimpahan plankton dan mikroplastik di perairan Balikpapan masih sangat terbatas. Tujuan dari penelitian ini adalah untuk mengkaji dan menganalisis jenis, perbandingan kelimpahan antara plankton dan mikroplastik di perairan Manggar, Balikpapan. Penelitian dilakukan pada bulan Oktober 2023 di perairan Manggar, kota Balikpapan. Penentuan lokasi sampling ditentukan dengan metode purposive sampling. Sampel air diambil menggunakan plankton net (mesh 20µm) dengan volume air sebanyak 50 L, di 4 titik sampling yang berbeda. Metode yang digunakan untuk mengidentifikasi plankton dan mikroplastik adalah metode inspeksi visual dengan menggunakan mikroskop. Hasil analisis menemukan bahwa komposisi jenis fitoplankton tertinggi adalah kelas Bacillariophyceae (20660 ind/L). Sedangkan komposisi jenis zooplankton tertinggi ditemukan dari kelas Oligotrichea (660 ind/L). Komposisi jenis mikroplastik yang ditemukan di perairan Manggar adalah fragmen 478 partikel (58%), disusul oleh fiber (272 partikel) (33%), dan film (73 partikel) (9%). Kelimpahan rerata total plankton adalah 936.000 ind/m3, sedangkan rerata total kelimpahan mikropastik adalah 344,3 partikel/m3. Perbandingan antara rasio kelimpahan plankton dan mikroplastik adalah 2718 : 1. Keberadaan plankton masih lebih melimpah  jika dibandingkan mikroplastik di perairan Manggar
Risk Analysis of Lead (Pb) in Anadara granosa from the Waters of North Penajam Paser Saputra, Muhammad Ikhsan; Nurfadilah, Nurfadilah; Ritonga, Irwan Ramadhan
Jurnal Biologi Tropis Vol. 25 No. 4 (2025): Oktober-Desember
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v25i4.10295

Abstract

Blood clam (Anadara granosa), a widely consumed filter-feeder in the coastal waters of Babulu Laut, East Kalimantan, has a high potential to accumulate lead (Pb) from its environment. This study aimed to determine the concentration of Pb in A. granosa and assess the potential health risks to humans associated with the consumption of A. granosa. A total of 45 A. granosa were caught by local fishermen. Each mussel was measured for length, destroyed using an acid method, and analysed using Atomic Absorption Spectrophotometry (AAS). The results of the study found that Pb concentrations ranged from 0.114 to 0.148 mg/kg dry weight. The Pb concentration in mussels was still below the maximum limit permitted by the Indonesian National Standard (SNI 7387:2009). The health risk assessment results found that the EWI value was relatively lower than the PTWI and the HQ value was lower than 1, indicating that there was not non-carcinogenic risk to consumers. Furthermore, the average cancer risk (TR) to consumers, including adults, adolescents and children, was low. Even though the Pb concentration was below the quality threshold, consumers may still need to be cautious about consuming A. granosa sourced from the coastal waters of Babulu Laut.
Analisis Kadar Formalin pada Ikan dan Seafood Asin dari Pasar Tradisional di Kota Samarinda, Indonesia Ritonga, Irwan Ramadhan; Suryana, Irma; Paputungan, Mohammad Sumiran; Arwadi, Mohammad Tri
JST (Jurnal Sains dan Teknologi) Vol. 13 No. 1 (2024): April
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jstundiksha.v13i1.72933

Abstract

Penggunaan formalin (FA) sebagai pengawet pada ikan dan seafood asin yang dijual di beberapa pasar tradisional di Kota Samarinda telah menjadi isu kesehatan masyarakat. Namun, informasi tentang kandungan dan penilaian resiko dari FA pada ikan dan seafood asin belum jelas. Penelitian ini bertujuan untuk mendeteksi dan menganalisis paparan formalin (FA) yang terdapat pada ikan dan seafood asin. Metode penelitian yang dilakukan adalah uji kuantitatif. Subjek dari penelitian ini adalah 148 sampel yang terdiri dari ikan (12 spesies) dan seafood (4 spesies) asin yang dibeli dan dikumpulkan dari beberapa pasar tradisional. Kandungan FA pada sampel ikan dan seafood asin ditentukan dengan menggunakan Spektrofotometer Spectroquant Prove 100 VIS pada absorbansi 628 nm. Semua data hasil analisis diolah menggunakan Microsoft Office Excel 2010 dan dijelaskan secara deskriptif. Hasil penelitian menunjukkan bahwa kadar FA pada ikan dan seafood asin berkisar 0,21 - 21,1 mg/kg dengan rerata 2,77 ± 4,39 mg/kg. Nilai estimasi asupan harian (EDI) berkisar 0,09 - 3,64 µg/kg berat badan perhari. Nilai target bahaya (HQ) kurang dari satu. Nilai resiko kanker (CR) menunjukkan bahwa konsumen laki-laki, perempuan dan anak-anak beresiko kanker melalui konsumsi ikan asin dan seafood. Kesimpulan dari penelitian ini adalah Para konsumen di Kota Samarinda harus berhati–hati dalam memilih dan  mengkonsumsi ikan dan seafood asin yang diperjualbelikan di pasar tradisional Kota Samarinda. Implikasi dari penelitian ini adalah pentingnya pemantauan dan pengawasan yang ketat terhadap penggunaan formalin sebagai pengawet pada ikan dan seafood asin yang dijual di pasar tradisional.
Analisis Jenis dan Kelimpahan Mikroplastik pada Kerang Darah (Anadara granosa) Hasil Tangkapan Nelayan di Kabupaten Penajam Paser Utara, Kalimantan Timur Fahrurozi, Zidhan Muhammad; Eryati, Ristiana; Ritonga, Irwan Ramadhan
Jurnal Laut Khatulistiwa Vol 8, No 3 (2025): October
Publisher : Dept. Marine Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/lkuntan.v8i3.99922

Abstract

Mikroplastik pada biota perairan merupakan salah satu permasalahan global yang dihadapi sekarang ini. Salah satu biota perairan yang diketahui mengakumulasi mikroplastik adalah kerang darah (Anadara granosa). Penelitian ini bertujuan untuk mengidentifikasi jenis dan kelimpahan mikroplastik serta menganalisis korelasi antara kelimpahan mikroplastik dengan ukuran kerang darah. A. granosa dengan ukuran yang berbeda (kecil, sedang dan besar) dikumpulkan dari hasil tangkapan nelayan di Kabupaten Penajam Paser Utara. Proses identifikasi mikroplastik pada A. granosa menggunakan metode mikroskopis secara visual. Berdasarkan hasil identifikasi, ditemukan 4 tipe mikroplastik yang ditemukan pada daging kerang yang didominasi oleh tipe fiber (507 partikel), fragmen (273 partikel), film (194 partikel) dan pellet (15 partikel). Kelimpahan mikroplastik yang terdapat pada daging A. granosa adalah tipe fiber (11,3 partikel/ind), fragmen (6,07 partikel/ind), film (4,31 partikel/ind), dan pellet (0,33 partikel/ind). Tipe fiber merupakan yang paling banyak ditemukan, yaitu 507 partikel per individu. Warna hitam sebanyak 289 partikel mendominasi pada tipe mikroplastik yang ditemukan. Hubungan antara kelimpahan mikroplastik dan ukuran kerang (panjang dan berat) memiliki tingkat korelasi sangat kuat dan signifikan (p < 0,05).
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 Vol. 18 No. 1 (2026): JURNAL ILMIAH PERIKANAN DAN KELAUTAN
Publisher : Faculty of Fisheries and Marine Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jipk.v18i1.77808

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.
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 Idris Mandang, Idris 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 Midlan Witrawan Muchlis Effendi Mufidah, Fitriatul Muhammad Riza Muthy, Najla Adellia Najwan Al-Ghifari 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 Zetsaona Sihotang