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INDONESIA
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 303 Documents
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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.

Page 31 of 31 | Total Record : 303

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