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INDONESIA
Jurnal Laut Khatulistiwa
Published by Universitas Tanjungpura
ISSN : 26146142     EISSN : 26148005     DOI : http://dx.doi.org/10.26418/lkuntan
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Energy Physics
Jurnal Laut Khatulistiwa is the media for dissemination of information about the ideas from researchers and practitioners whose interested with marine issues. This journal published three times a year by Department of Marine Science, Faculty of Mathematic and Natural Sciences, Tanjungpura University, i.e at February, June and October. The scope of the articles on this journal is focus on study of marine science, including utilization of computing technology and marine instruments, development of measurement methods, and other related study. This journal is expected to be helpfull for practitioners, policy makers, lecturers, students and other parties to better understanding the situation and condition about marine and can provide inspiration on development of ideas to contribute improvement solutions for marine issues globally.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 176 Documents
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Analysis of Sedimentation Types and Rates in the Waters of Tapulaga Village Soropia District Konawe Regency Southeast Sulawesi Lufiati, Lufiati; Irawati, Irawati; Takwir, Amadhan
Jurnal Laut Khatulistiwa Vol. 9 No. 2 (2026): July
Publisher : Dept. Marine Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/lkuntan.v9i2.98873

Abstract

This study aims to analyze sediment types based on the grain size distribution of sand and gravel fractions and to determine sedimentation rates in the waters of Tapulaga, Konawe Regency, Southeast Sulawesi. This coastal area is influenced by ocean currents, rainfall, and anthropogenic activities associated with sedimentation processes. The research method included sediment sampling using sediment traps for 14 days at five observation stations. Sediment type and grain size were analyzed using granulometric methods through dry sieving, focusing on sand and gravel fractions. Current velocity data were obtained through direct field measurements using a current drogue, while rainfall data were obtained from the BMKG. Data were analyzed descriptively to characterize sedimentation conditions and the aquatic environment. The results showed that sediments were dominated by medium sand and gravel. The average sedimentation rate was 0.0082 g/cm²/day, with the highest value of 0.0163 g/cm²/day at Station I and the lowest value of 0.0031 g/cm²/day at Station IV. Current velocities were categorized as very slow, ranging from 0.0151 to 0.0631 m/s, while rainfall during the study ranged from light to moderate. Variations in environmental conditions indicate a relationship with sedimentation processes, which were generally relatively low.
Inventory of Porifera Species in the Northern and Southern Parts of Tidung Kecil Island, Kepulauan Seribu Canakhya, Rayinda Al Ganiya; Sukardi, Ratnaduhita Aprilia Putri; Aizah, Pratiwi Nur
Jurnal Laut Khatulistiwa Vol. 9 No. 2 (2026): July
Publisher : Dept. Marine Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/lkuntan.v9i2.101279

Abstract

This study aims to identify the types of Porifera found in the northern and southern waters of Tidung Kecil Island, Kepulauan Seribu. A descriptive–exploratory approach was used through a free-roaming survey along a 150 m transect from the shoreline at each site. Samples were collected purposively based on substrate characteristics and environmental conditions favorable for sponge growth. Each specimen was identified through macroscopic observations of body form, color, and surface texture, and microscopic examination of spicule types using permanent slides. The result recorded six species belonging to the class Demospongiae: Aplysina aerophoba, Clathria prolifera, Siphonodictyon infestum, Spheciospongia inconstans, Cliona viridis, and Spongilla lacustris. Most species were found in the southern area dominated by hard sand and coral rubble substrates, while A. aerophoba and S. lacustris were observed in the northern area with finer sand substrates. The observed spicules were predominantly monoaxonic style forms, while C. prolifera exhibited a combination of oxeas and style, and A. aerophoba lacked spicules entirely. These findings indicate that morphological and spicular variations among porifera are closely related to local environmental conditions and substrate types, highlighting the high diversity of sponges in the shallow tropical waters of the Kepulauan Seribu.
Analysis of Microplastic Content in Sediments of the Pasir Sakti Mangrove Ecosystem, East Lampung Suhanda, Delilla; Syari, Chalida; Dwiputra, Mohammad Ashari; Rajab, Muhammad Arhan; Kurniawan, Alvin
Jurnal Laut Khatulistiwa Vol. 9 No. 2 (2026): July
Publisher : Dept. Marine Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/lkuntan.v9i2.104440

Abstract

Mangroves as buffer ecosystems possess a natural capacity to trap pollutants originating from both terrestrial and marine sources, including microplastics. This study aimed to identify and map the characteristics and distribution of microplastics in the sediments of the Pasir Sakti mangrove ecosystem. The study employed a descriptive–quantitative approach combining laboratory and geospatial analyses. Sediment samples were collected from five stations using purposive sampling and analyzed through granulometric analysis, microplastic extraction using a NaCl solution, and morphological identification of microplastics using a microscope. Ecological parameters, including water quality and mangrove vegetation structure, were measured in situ. The distribution of microplastics was visualized as thematic maps using a Geographic Information System (GIS). The results of water quality analysis showed temperatures ranging from 29.7 to 31.9 °C, salinity of 9–11 ppt, relatively high water pH values of 8.76–10.8, acidic soil pH values of 3–6.7, low water transparency of 22–30 cm, and very high TDS concentrations of 6,825–7,967 ppm. The sediment at the study site was predominantly classified as sand. The mangrove vegetation was dominated by Avicennia sp., with a density ranging from 0.24 to 0.67 individuals/m². A total of 259 microplastic particles were identified, comprising film, fragment, foam, fiber, and pellet types. Film was the dominant microplastic type, with a total of 160 particles.
Population Dynamics of Skipjack Tuna (Katsuwonus pelamis Linnaeus, 1758) Landed at Sadeng Coastal Fishing Port, Yogyakarta Siswana, Atkha Devi; Saputra, Suradi Wijaya; Taufani, Wiwiet Teguh
Jurnal Laut Khatulistiwa Vol. 9 No. 2 (2026): July
Publisher : Dept. Marine Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/lkuntan.v9i2.110615

Abstract

Skipjack tuna (Katsuwonus pelamis) is a major fishery commodity landed at PPP Sadeng, Gunungkidul, Special Region of Yogyakarta, primarily caught using purse seine gear. This study aimed to determine the growth parameters, mortality and exploitation rates. A total of 1,428 randomly sampled fish were collected from June to September 2025. Growth parameters were analyzed using the von Bertalanffy model through the TropFishR in R Studio. Results showed an asymptotic length (L∞) of 75.4 cm, a growth coefficient (K) of 0.93 year⁻¹, t₀ of -0.13, and an isometric growth pattern (b= 3.0003). The length at first capture (Lc) was 44.02 cm. Total (Z), natural (M), and fishing (F) mortality rates were 2.31, 0.93, and 1.38 per year, respectively, with an exploitation rate (E) of 0.59, indicates a condition of potential overfishing.
Assessing the Influence of ENSO on Monthly Rainfall in Samarinda City (1994–2024) Wibowo, Ragantar Nur; Ramadhan, Muhammad Luthfi; Wahyuda, Muhammad; Al-ghifari, Najwan; Budiarsa, Anugrah Aditya
Jurnal Laut Khatulistiwa Vol. 9 No. 2 (2026): July
Publisher : Dept. Marine Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/lkuntan.v9i2.104285

Abstract

Climate variability, specifically changes in monthly rainfall patterns, increases the risk of hydrometeorological disasters such as flooding and prolonged droughts in Samarinda City, East Kalimantan. This condition is amplified by the El Niño-Southern Oscillation (ENSO) phenomenon, which triggers the El Niño (drought) and La Niña (heavy rainfall) phases. This study analyzes the influence of ENSO on monthly rainfall variability in Samarinda City from 1994 to 2024. Monthly rainfall data were obtained from the Climate Hazards Group InfraRed Precipitation with Stations (CHIRPS), while ENSO conditions were represented by NOAA's Niño 3.4 sea surface temperature (SST) anomaly index. The analytical methods included time-series comparison, Pearson correlation analysis, ENSO phase classification based on a ±0.5°C threshold, and composite spatial analysis to map average rainfall distribution across El Niño, Neutral, and La Niña phases. The results demonstrate a statistically significant negative correlation between the Niño 3.4 index and monthly rainfall (r = -0.450; p = 6.38 × 10⁻²⁰). This indicates that rainfall in Samarinda tends to decrease significantly during El Niño conditions and increase during La Niña conditions. The coefficient of determination (R² = 0.202) reveals that ENSO accounts for approximately 20.2% of monthly rainfall variability, while the remaining 79.8% is influenced by other regional and seasonal climatic factors. These findings confirm that ENSO is a key climatic factor for improving risk assessment and hydrometeorological disaster mitigation in Samarinda City.
Water Quality Analysis (Physicochemical) Based on the Pollution Index in Pangempang Waters, Muara Badak, Kutai Kartanegara Lana, Achmad Rivaldy; Nurfadilah, Nurfadilah; Ritonga, Irwan Ramadhan
Jurnal Laut Khatulistiwa Vol. 9 No. 2 (2026): July
Publisher : Dept. Marine Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/lkuntan.v9i2.105642

Abstract

The entry of pollutants into the aquatic environment has the potential to degrade water quality, thereby lowering the water quality status and threatening the survival of aquatic biota. This study aimed to determine the water quality status based on physicochemical parameters in the waters of Pangempang, Muara Badak, Kutai Kartanegara. Observations were conducted at six stations, located both inside and outside the bay using a combination of field measurements and laboratory analyses. Physical parameters observed included temperature, transparency, current, and turbidity, while chemical parameters included BOD₅, dissolved oxygen, phosphate, nitrate, pH, and salinity. Water quality assessment utilized the Pollution Index method, referencing the State Minister for the Environment Decree No. 115 of 2003, with marine biota quality standards based on the State Minister for the Environment Decree No. 51 of 2004. The results indicated that certain parameters fell below the quality standards, specifically dissolved oxygen (3.69 mg/L) and phosphate (0.005–0.023 ± 0.011 mg/L), whereas turbidity (24.1 NTU) and nitrate (0.095 mg/L) exceeded the standard thresholds, necessitating monitoring. The calculated Pollution Index value was 3.23, indicating that the waters are classified as lightly polluted.

Page 18 of 18 | Total Record : 176

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