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Journal of Coastal and Ocean Sciences
Published by Universitas Riau
ISSN : 27454355     EISSN : 27464512     DOI : -
Core Subject : Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science Immunology & microbiology Physics
Journal of Coastal and Ocean Sciences is a journal publishes scientific articles from research by lecturers and other researchers in the marine sector. Covers aspects of biology, physics and chemistry, both for brackish waters (mangrove swamps, river estuaries) and marine waters (coastal and offshore seas).
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Perairan
Articles 10 Documents
 1 
Search results for , issue "Vol. 7 No. 2 (2026): May" : 10 Documents clear
Composition, Types, and Abundance of Microplastics in Water, Sediments, and Blood Clams (Anadara granosa) in the Coastal Waters of Sinaboi, Rokan Hilir Regency Rinaldy, Rahmat; Amin, Bintal; Nedi, Syahril
Journal of Coastal and Ocean Sciences Vol. 7 No. 2 (2026): May
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.7.2.92-101

Abstract

Microplastics are plastic particles smaller than 5 mm that are difficult to degrade and tend to persist for long periods. This study aims to analyze the types and abundance of microplastics, as well as differences in abundance and their relationships in water, sediment, and blood clams (Anadara granosa). This study was conducted in the waters off Sinaboi Beach, Rokan Hilir Regency, and continued at the Marine Chemistry Laboratory, Department of Marine Science, Faculty of Fisheries and Marine Sciences, Universitas Riau. The method used was a survey employing a purposive sampling approach. The results of this study indicate that the composition of microplastic types found in the waters of Sinaboi Beach included fibers, fragments, films, foams, and granules (pellets); however, in the sediments and blood clams, only granules (pellets) were found. The average abundance of microplastics in water, sediment, and blood clams was 1,467 particles/L, 1,299 particles/g, and 6,844 particles/g, respectively. Statistical analysis showed that the abundance of microplastics in water, sediment, and blood clams based on sampling stations did not differ significantly (p > 0.05). Microplastic abundance in blood clams differed significantly from that in water and sediment (p < 0.05), whereas the comparison between water and sediment showed nearly equivalent abundance levels (p > 0.05). The strongest relationship was found between microplastic abundance in blood clams and sediment, showing a moderate positive correlation
Analysis of Microplastic Types and Abundance in Water, Sediments, and Lokan Clams (Geloina erosa) in the Coastal Waters of Sinaboi, Rokan Hilir Nur’aini, Intan; Amin, Bintal; Siregar, Yusni Ikhwan
Journal of Coastal and Ocean Sciences Vol. 7 No. 2 (2026): May
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.7.2.79-86

Abstract

The objective of this study is to identify the species and abundance in the water, sediment, and the lokan clam to determine differences in abundance among the water, sediment, and the lokan clam and to examine the relationship between abundance in the water and sediment and the abundance of the lokan clam. This study was conducted from October to December 2025 in the waters off Sinaboi Beach. The methods used in this study were a survey and purposive sampling, with samples collected directly at the study site. Sample analysis was performed at the Marine Chemistry Laboratory, Department of Marine Sciences, Faculty of Fisheries and Marine Sciences, Universitas Riau. Samples were collected from three types of test materials: water, sediment, and lokan clam from the waters off Sinaboi Beach. The results of the study showed that environmental parameters ranged from 7.38–8.20 for pH, 29–31°C for temperature, 24–29‰ for salinity, and 0.50–1.21 m/s for current velocity. Four types of microplastics were found in the water, sediment, and lokan clam: fibers, fragments, films, and foam. The average microplastic abundance in water was 0.45 particles/L. In sediment, it was 1.74 particles/g. The average microplastic abundance in lokan clam was 2.20 particles/g. Statistical analysis indicates a significant difference in microplastic abundance in water, sediment, and the lokan clam (p < 0.05). Microplastic abundance in sediment and the lokan clam shows a stronger correlation because clams are filter-feeding organisms that accumulate microplastics from sediment
Estimation of Carbon Storage in Necromass in the Mangrove Area of Kayu Ara Permai Village, Siak Regency Simanjuntak, Ezra Yehezkiel Rumegius; Siregar, Yusni Ikhwan; Siregar, Sofyan Husein
Journal of Coastal and Ocean Sciences Vol. 7 No. 2 (2026): May
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.7.2.73-78

Abstract

This research was conducted in March 2025 at the Mangrove Area of Kayu Ara Permai Village, Sungai Apit Subdistrict, Siak Regency. The study aimed to estimate the organic matter and carbon stocks of necromass and to determine the relationship between the number of necromass and its carbon stock. The method used was a survey, with purposive sampling, at three research stations. Measurements of organic matter and carbon stock of necromass were carried out using the volume method. The results showed that mangrove density ranged from 2,377.78 to 3,088.89 ind/ha, necromass organic matter ranged from 0.9676 to 2.1520 tons/ha, and necromass carbon stock ranged from 0.4548 to 1.0114 tons/ha. Based on the results of this study, there was a very weak positive correlation between necromass amount and its carbon stock, with a correlation coefficient (r) of 0.188.
Carbon Stock Analysis in Mangrove Vegetation in Selat Baru Village, Bengkalis Regency, Riau Province Siagian, Aron Girgir Parade; Siregar, Sofyan Husein; Yoswaty, Dessy
Journal of Coastal and Ocean Sciences Vol. 7 No. 2 (2026): May
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.7.2.87-91

Abstract

Mangrove forests play a crucial ecological role in coastal ecosystems. One of its ecological functions is that mangroves absorb and store carbon, thereby reducing carbon emissions. The increase in atmospheric CO2 levels is a result of human activities, both directly and indirectly. This study aims to assess mangrove stand density, determine differences in mangrove stand density and carbon stocks between stations, and examine the relationships between mangrove stand density and biomass, carbon stocks, and CO2 absorption in the mangrove area of ​​Selat Baru Village, Bengkalis Regency, Riau Province. This research was conducted in November 2024 in Selat Baru Village, Bengkalis Regency, Riau Province. The method used in this study was a survey. To determine the relationship between mangrove tree density and carbon stock, a regression test was performed. Mangrove Stand Density ranged from 877.78 - 1,211.11 ind/ha. Mangrove biomass ranged from 22.62 to 30.16 tons/ha. Carbon Stock ranges from 10.63-14.19 tons/ha. CO2 absorption ranges from 38.98-51.98 tons/ha. The density of mangrove stands and carbon stocks show a moderate relationship, as indicated by the correlation coefficient (r) of 0.736.
Growth of Rhizophora apiculata and Rhizophora mucronata on Different Sediment Types in the Marine Station Area of the Universitas Riau, Dumai Prameswari, Cinta Riyanda; Efriyeldi, Efriyeldi; Siregar, Yusni Ikhwan; Zulkifli, Zulkifli; Ilahi, Ilham
Journal of Coastal and Ocean Sciences Vol. 7 No. 2 (2026): May
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.7.2.102-107

Abstract

Mangroves play an important role in maintaining coastal stability and supporting ecological functions in coastal waters. This study aimed to analyze differences in the growth of Rhizophora apiculata and R. mucronata under different sediment types at the Marine Station of Universitas Riau, Dumai. Observations were conducted for 10 weeks at two stations, namely sandy mud and mud sediments, using 24 mangrove seedlings with an initial height of ≥ 60 cm. The results showed significant differences in growth between mangrove species and between observation stations (p < 0.05). In sandy mud sediment, R. apiculata exhibited better growth (64.33 ± 3.92 mm; 7.20 ± 0.46 mm), whereas in mud sediment, R. mucronata showed more optimal growth (72.36 ± 7.54 mm; 7.87 ± 0.52 mm). Seedling survival reached 100% at both stations. These findings indicate that the suitability of mangrove species to sediment characteristics is an important consideration in mangrove rehabilitation efforts
Abundance of Microplastics in Water and Sediment in Coastal Waters of Tanah Merah Village, Meranti Islands Regency Saputra, Rengki; Amin, Bintal; Nedi, Syahril
Journal of Coastal and Ocean Sciences Vol. 7 No. 2 (2026): May
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.7.2.108-113

Abstract

This study aims to analyze the types and abundance of microplastics in water and sediment between research stations and to examine differences in microplastic abundance across sediment depths in the coastal waters of Tanah Merah Village, Meranti Islands Regency. Samples were taken from three different locations: residential areas, fishing ports, and mangrove areas. The number of water and sediment samples from the three research stations was 27. Water quality parameters, including temperature, salinity, pH, and current velocity, were measured to assess the condition of the aquatic environment. The results showed that four types of microplastics were found, namely fragments, fibers, films, and pellets. The abundance of microplastics in seawater had an average value of 0.86 particles/L, with fragments being the most dominant type. Meanwhile, the abundance of microplastics in sediment had an average value of 1084.33 particles/kg of sediment, with fibers dominating. Based on sediment depth, the highest microplastic abundance was observed at station three in the 0-10 cm layer, with an average of 1010 particles/kg of sediment. The abundance of microplastics in water and sediment shows a significant difference. This is because there is a significant relationship between the abundance of microplastics in water and sediment
Analysis of the Content of Suspended Solids and Sedimentary Organic Matter in the Coastal Waters of Bokor, Meranti Island Regency Saputra, Hafiz Zikra; Nurrachmi, Irvina; Yoswaty, Dessy
Journal of Coastal and Ocean Sciences Vol. 7 No. 2 (2026): May
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.7.2.114-118

Abstract

This study aims to analyse the concentrations of Total Suspended Solids (TSS) and sediment organic matter, as well as their relationship, in the coastal waters of Bokor Village, Kepulauan Meranti Regency. The research was conducted from December 2024 to January 2025 using a survey method at three observation stations selected based on varying levels of human activity. TSS analysis was performed gravimetrically according to the Indonesian National Standard (SNI 6989.3:2019), while sediment organic matter was analysed using the Loss on Ignition (LOI) method. The results showed that TSS concentrations ranged from 10.4 to 17.56 mg/L and were within the good-quality standard for marine waters. The concentration of sediment organic matter ranged from 3.0% to 5.7%, which is categorised as low. A simple linear regression analysis indicated a weak positive correlation between TSS and sediment organic matter. This suggests that suspended solids account for only 10.1% of the variability in sediment organic matter, with the remaining variation influenced by other environmental factors.
Effect of Light Intensity on the Abundance of Zooxanthellae on Branching Corals (Acropora sp.) at Pagang Island Waters, West Sumatra Desnaldi, Muhammad Zikran; Thamrin, Thamrin; Siregar, Sofyan Husein
Journal of Coastal and Ocean Sciences Vol. 7 No. 2 (2026): May
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.7.2.119-125

Abstract

Zooxanthellae are symbiotic microalgae that live within coral tissue, playing a vital role in photosynthesis and providing energy to the coral through their metabolic products. Various environmental factors, including light intensity, can influence the abundance of zooxanthellae in corals. This study aimed to determine the abundance of zooxanthellae in branching corals (Acropora sp.) based on different light intensities and to analyze the effect of light intensity on the abundance of zooxanthellae in branching corals (Acropora sp.). This research was conducted in May 2025 at Pagang Island Waters, West Sumatra. The method used in this research is a field experiment. The coral colonies used in the research were assigned to 4 treatments to achieve different light intensities for the samples. The results of this study indicate that there are differences in the abundance of zooxanthellae in branching corals (Acropora sp.) based on different light intensities. The average abundance of zooxanthellae in treatment 1 (control = 694-702 µE/m2s) was 9,961,707 cells/cm2, in treatment 2 (200 µE/m2s) was 5,715,698 cells/cm2, in treatment 3 (100 µE/m2s) was 3,589,326 cells/cm2, and in treatment 4 (0 µE/m2s) was 1,530,447 cells/cm2. This study also shows a very strong relationship between light intensity and the abundance of zooxanthellae in branching corals (Acropora sp.).
Population Structure of Blood Cockle (Anadara antiquata) in the Intertidal Zone of Sinaboi Coastal Waters, Rokan Hilir Chairunissa, Suci Maurizka; Nasution, Syafruddin; Zulkifli, Zulkifli
Journal of Coastal and Ocean Sciences Vol. 7 No. 2 (2026): May
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.7.2.126-132

Abstract

Blood cockle (Anadara antiquata) is one of the benthic organisms commonly found in intertidal ecosystems and has important ecological and economic roles in coastal areas. Information regarding its population condition is needed to support sustainable resource management. This study aimed to analyze the population structure of A. antiquata in the intertidal zone of Sinaboi coastal waters, Rokan Hilir. This research was conducted in October 2025 in the coastal waters of Sinaboi, Rokan Hilir. Sample analysis was carried out at the Marine Biology and Physical Oceanography Laboratory, Department of Marine Science, Faculty of Fisheries and Marine Science, Universitas Riau. The study used a survey method through direct observation, measurement of environmental parameters, and sampling. Sampling was conducted using purposive sampling across three intertidal subzones: lower, middle, and upper. The results showed that environmental parameters ranged from 30–32°C for temperature, 30‰ for salinity, 7 for pH, and 7–8 cm for water transparency. The sediment type was muddy with organic matter content ranging from 7.66–14.66%. The highest abundance of A. antiquata was found in the lower subzone (60,000 ind/ha), while the lowest was in the middle subzone (46,000 ind/ha). Statistical analysis indicated no significant difference in abundance among subzones (p > 0.05). Shell size ranged from 18.1–57.4 mm and was dominated by small and medium size categories
Analysis of Mangrove Vegetation Community Structure in Bukit Batu Village, Bukit Batu District, Bengkalis Regency, Riau Putri, Rahadiva Anjani; Samiaji, Joko; Nasution, Syafruddin
Journal of Coastal and Ocean Sciences Vol. 7 No. 2 (2026): May
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jocos.7.2.133-140

Abstract

The mangrove ecosystem in Indonesia is rich in biodiversity and plays an important role in maintaining coastal balance, but it is currently under pressure from human activities. This study was conducted in December in Bukit Batu Village, Bukit Batu District, Bengkalis Regency, an area with an extensive mangrove ecosystem that is vulnerable to anthropogenic pressure. The study aims to identify mangrove species and analyze density, importance value index (INP), and vegetation zonation patterns using a field survey at three stations. Stations were determined using purposive sampling, and mangrove observations were conducted using the line transect method, with each station consisting of 3 transects and each transect consisting of 3 plots (10m×10m for trees, 5m×5m for saplings, and 2×2 m2 for seedlings). The results showed six mangrove species, i.e., Rhizophora apiculata, Avicennia alba, Sonneratia alba, Bruguiera gymnorrhiza, Xylocarpus granatum, and Nypa fruticans. Environmental conditions were dominated by mud substrate, with>75% containing 12.31–22.34% organic matter. Tree density ranged from 833.33–1,533.33 ind/ha and was dominated by R. apiculata, which also had the highest INP. Statistical analysis indicated no significant differences in density among stations (p>0.05). The zonation pattern showed differences in species composition between the sea and the land, at Station I, zones I–R. Apiculata, B. gymnorrhiza, and N. fruticans dominated III. At Station II, zone I was dominated by S. alba, while zones II–III were dominated by R. apiculata. At Station III, zones I–II were dominated by R. apiculata with X. granatum in zone II, and zone III was dominated by X. granatum.

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