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Gedung Marine Center (Lt 2) Jurusan Ilmu Kelautan, Universitas Riau Kampus Bina Widya, Jl. HR. Soebrantas Km. 12,5 Panam, Pekanbaru, Indonesia-28293
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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 293 Documents
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Heavy Metal Concentrations in Avicennia alba from the Western Coast of Dumai City, Riau Province Yona, Fitria Mai; Amin, Bintal; Efriyeldi, Efriyeldi
Journal of Coastal and Ocean Sciences Vol. 6 No. 3 (2025): September
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.6.3.132-138

Abstract

Coastal ecosystems play a crucial role in supporting biodiversity, but are increasingly threatened by heavy metal pollution from industrial and domestic activities. The mangrove species Avicennia alba can absorb heavy metals through phytoremediation processes, making it a promising bioindicator of environmental contamination. This study aimed to analyze the concentrations and variations in the accumulation of lead (Pb) and copper (Cu) in A. alba roots, stems, and leaves along the western coast of Dumai City, Riau Province. Fieldwork was conducted from January to February 2025 at two sampling sites: Pangkalan Sesai Village (Station 1) and Purnama Village (Station 2). Heavy metal concentrations were determined using Atomic Absorption Spectrophotometry (AAS) following wet digestion. Environmental parameters were also measured, including temperature, salinity, and pH. Data analysis involved descriptive statistics, non-parametric tests, and independent t-tests. The results indicated that Pb and Cu were present in all plant parts. The highest concentration of Pb was found in the stems (7.05 µg/g), while Cu was most concentrated in the roots (5.38 µg/g). No statistically significant differences were observed among plant parts (p > 0.05); however, a significant spatial difference in Pb concentrations between the two stations was detected (p < 0.05). These findings suggest that anthropogenic activities and local water quality conditions likely Influence the observed variations. Overall, A. alba demonstrates strong potential as a bioindicator species for monitoring heavy metal contamination in coastal environments.
Potential Carbon Stock and Absorption in Mangroves in Penempul Village, Sungai Sembilan District, Dumai City, Riau Province Yuhanda, Sabina Dwi; Siregar, Yusni Ikhwan; Tanjung, Afrizal
Journal of Coastal and Ocean Sciences Vol. 6 No. 3 (2025): September
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.6.3.189-196

Abstract

Global warming is caused by increased greenhouse gas emissions, particularly CO₂, and can be controlled through carbon sequestration by vegetation, including mangrove forests. The study was conducted in January and February 2025 in the mangrove area of Penempul Village, Sungai Sembilan District, Dumai City, Riau Province, to determine the density in relation to biomass, carbon stock, and CO₂ absorption, as well as to investigate the relationship between density and biomass, carbon stock, and CO₂ absorption. The method used in this study was a survey method with a purposive sampling technique, which involved measuring the diameter of mangrove tree trunks at chest height (DBH). Mangrove biomass calculations were performed using allometric equations, and biomass was converted into carbon stock and CO₂ absorption. The study results indicated the presence of 11 mangrove species, with average estimated biomass, carbon stock, and CO₂ absorption values of 521.84 tons/ha, 245.25 tons/ha, and 899.35 tons/ha, respectively. The ANOVA results showed significant differences (p > 0.05) between the three stations regarding biomass, carbon stock, and CO₂ absorption. Mangrove density had a weak correlation with biomass, carbon stock, and CO₂ absorption, with a correlation coefficient of 0.299.
Storage Temperature on the Product Quality of Several Pro Coffee Variants That Contain (Bacillus cereus SN7) Farisy, Muhammad Fhito Al; Feliatra, Feli; Batubara, Ummi Mardhiah
Journal of Coastal and Ocean Sciences Vol. 6 No. 3 (2025): September
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.6.3.197-201

Abstract

This study aims to analyze the effect of storage temperature on microbial growth in several pro coffee variants and to investigate the impact of storage temperature on the quality of pro coffee containing B. cereus SN7. The coffee variants used were original, latte, original jelly, and latte jelly at temperatures of 10, 25, and 37°C for 7 days of storage. Microbial growth was observed using the total plate count method, while the pro coffee quality was analysed using the organoleptic test. The results showed that low storage temperatures can inhibit microbial growth and maintain the quality of pro coffee. The lowest total number of microbes was found in the original variant with a storage temperature of 10°C, with a value of 0.11 × 103 CFU/mL, and the highest total number of microbes was found in the latte jelly variant with a storage temperature of 25°C, with a value of 3.476 × 103 CFU/mL. In the organoleptic test, the highest value was found in the latte variant coffee at a storage temperature of 10°C, categorized as 'very like', with a value of 35% for taste, 30% for aroma, and 30% for colour. The effect of temperature on the product quality of several probiotic coffee variants containing B. cereus SN7 showed a significant difference (p < 0.05) in microbial growth and the quality value of the probiotic coffee. Statistical analysis showed the effect of temperature on the product quality of several pro coffee variants containing B. cereus SN7.

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