Seasonal fluctuation of nutrients and primary productivity of the coastal waters of Culaman, Malita, Davao Occidental

Authors

  • Pedro M. Avenido Institute of Fisheries and Marine Sciences (IFMS), Southern Philippines Agri-business and Marine and Aquatic School of Technology (SPAMAST) https://orcid.org/0000-0002-1308-4384
  • Larife M. Garley Institute of Fisheries and Marine Sciences (IFMS), Southern Philippines Agri-business and Marine and Aquatic School of Technology (SPAMAST) https://orcid.org/0009-0004-2602-1966
  • Michael Jeriel I. Bersaldo Department of Marine Science, College of Science and Mathematics (CSM), Mindanao State University-Iligan Institute of Technology (MSU-IIT) https://orcid.org/0000-0003-1988-649X

DOI:

https://doi.org/10.59120/drj.v14i1.39

Keywords:

coal plant, chlorophyll-a, nutrient, phytoplankton, water quality

Abstract

The study was conducted to determine the nutrient and chlorophyll-a concentration of coastal water at Barangay Culaman, Malita, Davao Occidental between two seasons. One shot sampling was done during the rainy season on November 19, 2017, and November 26, 2017. It was also done during summer season on March 6, 2018, and March 11, 2018. Water samples were collected in the surface (5-10 cm depth) and subsurface (below 1m depth). Nutrients were analyzed in terms of their concentration expressed in mg/L, including ammonia, nitrate, nitrite, and phosphate. Chlorophyll-a was included being the most reliable index of primary productivity in seawater. Nitrate, nitrite, phosphate, and chlorophyll-a showed high concentration during rainy season while ammonia exhibited a high concentration during summer season. Further, nutrients were found in high concentrations from surface water compared to those from subsurface water. There were no significant differences in nutrient and chlorophyll-a concentrations between stations except for nitrate. In terms of its concentration between rainy and summer season, and between surface and subsurface waters, there were no significant differences in ammonia, nitrate, and phosphate.  However, significant differences in the concentrations of nitrite and chlorophyll-a between rainy and summer season and between surface and subsurface water samples were observed.  The prevailing levels of temperature, salinity, dissolved oxygen, and turbidity observed during sampling were found to be normal.

 

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Author Biographies

Pedro M. Avenido, Institute of Fisheries and Marine Sciences (IFMS), Southern Philippines Agri-business and Marine and Aquatic School of Technology (SPAMAST)

8012 Poblacion, Malita, Davao

Larife M. Garley, Institute of Fisheries and Marine Sciences (IFMS), Southern Philippines Agri-business and Marine and Aquatic School of Technology (SPAMAST)

8012 Poblacion, Malita, Davao

Michael Jeriel I. Bersaldo, Department of Marine Science, College of Science and Mathematics (CSM), Mindanao State University-Iligan Institute of Technology (MSU-IIT)

9200 Tibanga, Iligan City, Lanao del Norte.

References

Abreo, N. A. S., Macusi, E. D., Cuenca, G. C., Ranara, C. T. B., Andam, M. B., Cardona, L. T., & Arabejo, G. F. P. (2015). Nutrient enrichment, sedimentation, heavy metals and plastic pollution in the marine environment and its implications on Philippine marine biodiversity: A Review. IAMURE International Journal of Ecology and Conservation, 15(1), 111-167. htp://dx.doi.org/10.7718/ijec.v15i1.999

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Published

2023-06-27

How to Cite

Avenido, P., Garley, L., & Bersaldo, M. J. (2023). Seasonal fluctuation of nutrients and primary productivity of the coastal waters of Culaman, Malita, Davao Occidental. Davao Research Journal, 14(1), 55–72. https://doi.org/10.59120/drj.v14i1.39

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Section

Articles