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Journal of Marine and Coastal Science
Published by Universitas Airlangga
ISSN : 23016159     EISSN : 25280678     DOI : http://dx.doi.org/10.20473/jmcs.v9i2.20064
Core Subject : Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science Immunology & microbiology
The Journal of Marine and Coastal Science is a scientific journal that publishes articles related to marine science and coastal management, including seafood nutrition, marine microbiology, marine biotechnology, coastal management, and marine biodiversity research
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Perairan
Articles 6 Documents
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Search results for , issue "Vol. 15 No. 1 (2026): FEBRUARY" : 6 Documents clear
Carbon Storage in Seagrass in The East and North Coastal Waters of Bintan Island Alsha, Syahbana Advani; Zulfikar, Andi; Retna Melani, Winny
Journal of Marine and Coastal Science Vol. 15 No. 1 (2026): FEBRUARY
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jmcs.v15i1.75590

Abstract

Seagrass has the ability to store carbon by utilizing CO2 to be used as a photosynthesis component which has the potential as blue carbon. This research was aimed to determine density, and biomass in the East and North Coastal Waters of Bintan Island; determine the carbon storage contained in seagrass in the East and North Coastal Waters of Bintan Island; and determine the relationship between density, biomass, and carbon storage in seagrasses in the East and North Coastal Waters of Bintan Island. The research was conducted in Teluk Bakau, Malang Rapat, Berakit, and Pengudang from August 2024 to May 2025. The tools and materials used were 50 × 50 cm2, oven, muffle furnace, shieve net, underwater camera, plastic bag, seagrass samples, and substrate samples. The research procedures was used systematic random sampling method and the sampling design used in determining sampling points was a nested hierarchical design. The method of calculating the value of carbon storage in seagrasses used the Walkley and Black method. The data analysis was carried out by calculating the value of density, biomass; then calculating the value of carbon storage in seagrasses, and testing the relationship between density, biomass, and carbon storage in seagrasses. Density in the eastern region ranged from 284-577 shoot/m2 and in the northern region ranged from 107-816 shoot/m2. Biomass in the eastern region ranged from 39,31-82,99 gr/m2 and in the northern region ranged from 19,39-138,55 gr/m2. Carbon storage in the eastern region ranged from 27,46-31,03% and in the northern region ranged from 23,93-28,30%. The results of the correlation test show that density has a moderate relationship and is directly proportional to biomass with a correlation value of 0.51; density has a very weak relationship and is inversely proportional to carbon storage with a value of -0.09; and biomass has a weak relationship and is inversely proportional to carbon storage with a value of -0.24.
Estimation of Nitrogen (N) Storage in Seagrass in The East and North Coastal Waters of Bintan Island Ismi Dwi Yulianti; Zulfikar, Andi; Retna Melani, Winny
Journal of Marine and Coastal Science Vol. 15 No. 1 (2026): FEBRUARY
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jmcs.v15i1.75591

Abstract

Seagrass has high primary productivity and is highly dependent on the availability of nitrogen as the main nutrient that supports growth, photosynthesis, and biomass, including in the waters of Bintan, Indonesia. This research was conducted to determine the density, biomass, and nitrogen content of seagrass, as well as the influence of density and biomass on nitrogen storage to support sustainable conservation management in the Eastern and Northern regions of Bintan Island. The research was conducted from August 2024 to May 2025 by taking seagrass samples using the nested hierarchical design method based on systematic random sampling. Nitrogen measurements are carried out using the Kjeldahl method which converts organic nitrogen into ammonium sulfate. Based on this research, the highest density (816.1 stands/m2) and biomass (138.56 g/m2) of seagrass were in Pengudang. The lowest density and biomass were in Berakit_2 with values of 106.8 stands/m2 and 19.03 g/m2, respectively. The highest nitrogen (0.758%) was found in 2 locations, namely Pengudang and Teluk Bakau_2, while the lowest nitrogen (0.359%) was in Berakit_1. Based on regression analysis, the density and biomass of seagrass had a significant effect on nitrogen storage with a regression value of 0.642.
Parameterizing the Wind-Wave Relation with or Without Fetch Parameter for Marine Science and Engineering Hsu, Shih-Ang (S.. A.)
Journal of Marine and Coastal Science Vol. 15 No. 1 (2026): FEBRUARY
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jmcs.v15i1.78104

Abstract

In the realm of wind and wave interaction, traditionally, nearly all coastal and marine scientists and engineers have used the JONSWAP wave spectra which contains a variable called the “Fetch Parameter, X”. Since it is a challenge to determine this parameter objectively, most recently, this author has proposed an alternative method to link the wind speed at 10-m, U10 to the significant wave height, Hs. All units employed in this study are in SI. In this short communication, we first demonstrate in the Introduction that one needs caution to apply the wind-wave relation containing the fetch parameter. Then, based on the simultaneous measurements of the wind speed at 10-m, U10 (up to 72 m s -1) and the significant wave height, Hs (up to 27.6 m), during Hurricane Lili and Super-Typhoon Soudelor, the fetch parameter, X in km, used in the JONSWAP wave spectra is found to be X 0.5 = 5.5Ln (Hs) + 7.4 with a correlation coefficient, R = 0.90, so that U10 = 61Hs/(5.5Ln(Hs) + 7.4). Comparing this proposed formula for the wind-wave relation with the fetch parameterization against a relation without fetch parameter in the literature, i.e., U10 = 2.33Hs + 6, indicates that there is nearly no difference. However, further analysis based on simultaneous measurements of U10 and Hs without X during six hurricanes shows this formula is useful for air-sea interaction studies including the estimation of overwater friction velocity and wind stress determination to bypass the use of the drag coefficient which varies greatly.
Assessing Marine Reserve Effects on Limpet Diversity and Abundance in Rock Pools along The Eastern Cape Coast of South Africa Nakin, Motebang DV; Zvavahera, Munetsi
Journal of Marine and Coastal Science Vol. 15 No. 1 (2026): FEBRUARY
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jmcs.v15i1.80366

Abstract

Overexploitation of coastal marine resources driven by rapid human population growth has increased pressure on wild marine species. Marine reserves have been established along the South African coast to mitigate these impacts; however, their effects on macroinvertebrate communities, particularly limpets inhabiting rock pools along the Eastern Cape coast, remain poorly understood. This study assessed the abundance and diversity of limpets in rock pools within marine reserves and adjacent non-reserve areas to evaluate the ecological benefits of protection and biodiversity distribution across intertidal microhabitats. Sampling was conducted over 12 months at four sites: two marine reserves (Dwesa-Cwebe and Hluleka Nature Reserves) and two non-reserves (Nqabara and Presley’s Bay). At each site, rock pools were sampled across three shore zones (mid-low, mid-high, and high shore). Data were analysed using PRIMER v7 and Statistica v14.1. Limpet diversity was estimated using Shannon’s Diversity Index, while abundance was measured as individuals per square metre. A total of 11 limpet species were recorded. Dwesa-Cwebe Nature Reserve exhibited the highest diversity (10 species), followed by Nqabara (9), Presley’s Bay (8), and Hluleka Nature Reserve (6). Limpet abundance and diversity were higher at Dwesa-Cwebe and Nqabara than at Hluleka and Presley’s Bay. These findings suggest that marine reserves may enhance protection of certain species but do not necessarily increase overall species diversity. Clear conservation objectives are therefore essential when establishing marine reserves.
Bio Secrets of Coral Reefs Underneath the Shore Ibrahim, Nur Aifiah Binti Ibrahim
Journal of Marine and Coastal Science Vol. 15 No. 1 (2026): FEBRUARY
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jmcs.v15i1.83119

Abstract

Coral reefs are highly complex marine ecosystems that support biodiversity, fisheries, coastal protection, and livelihoods, yet they are increasingly threatened by climate change, pollution, and human activities. This study investigates coral reef health using a mixed-methods approach that integrates socio-ecological perspectives with biophysical and spatial analyses. Semi-structured interviews with marine scientists, local stakeholders, and conservation practitioners documented perceptions of coral bleaching, reef degradation, restoration strategies, and governance. These insights were complemented by field observations and secondary data assessing coral structure, sediment composition, carbon sequestration, and the presence of radionuclides and heavy metals. Reef structural complexity was evaluated using rugosity indices and underwater photogrammetry, supported by spatial mapping of reef morphology and environmental conditions. Results confirm that reef health depends on tightly coupled biological and socio-economic processes, with degradation driven by climate stress, pollution, and human pressure. Human-mediated restoration, community-based conservation, and coordinated governance emerged as critical factors for enhancing reef resilience. The study highlights the need for integrated, multi-scale monitoring and management strategies to support sustainable coral reef conservation under accelerating environmental change.
Antioxidant Activity of Gracilaria verrucosa Extract in Body Lotion Formulation Fransisca, Fida; Mubarak, Ahmad Shofy; Mahasri, Gunanti
Journal of Marine and Coastal Science Vol. 15 No. 1 (2026): FEBRUARY
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jmcs.v15i1.84713

Abstract

Indonesia has a tropical climate with high year-round solar exposure, which increases the risk of oxidative stress and premature skin aging caused by ultraviolet radiation. Red seaweed Gracilaria verrucosa is known to contain bioactive compounds with potential antioxidant properties; however, its application as a substitute for synthetic antioxidants in cosmetic formulations remains limited. This study aimed to evaluate the antioxidant activity of G. verrucosa extract and its potential as an alternative to Butylated Hydroxytoluene (BHT) in body lotion formulations. Extraction was performed using 96% ethanol through maceration for 48 hours, resulting in an extract yield of 2.47%. The study employed an experimental method with a Completely Randomized Design consisting of five treatments, including a control without antioxidants (K0), BHT 0.1%, and G. verrucosa extract at concentrations of 3%, 5%, and 7%, with four replications. Phytochemical screening revealed the presence of alkaloids, flavonoids, saponins, phenolics, and steroids, while tannins were not detected. The IC₅₀ value of G. verrucosa extract was 63.57 ppm, indicating strong antioxidant activity. The IC₅₀ values of body lotion formulations were 1,266 ppm (K0), 137.77 ppm (BHT 0.1%), 175.95 ppm (EGV 3%), 131.82 ppm (EGV 5%), and 106.17 ppm (EGV 7%). The incorporation of G. verrucosa extract into body lotion exhibited antioxidant activity comparable to or higher than that of BHT 0.1%, indicating its potential as a safe and sustainable natural antioxidant for marine-based cosmetic formulations.

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