Nutrient inputs from submarine groundwater discharge on the Santiago reef flat, Bolinao, Northwestern Philippines |
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| Authors: | Senal Maria Isabel S Jacinto Gil S San Diego-McGlone Maria Lourdes Siringan Fernando Zamora Peter Soria Lea Cardenas M Bayani Villanoy Cesar Cabrera Olivia |
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| Institution: | Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines. isabelsenal@gmail.com |
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| Abstract: | Submarine groundwater discharge (SGD) on the reef flat of Bolinao, Pangasinan (Philippines) was mapped using electrical resistivity, 222Rn, and nutrient concentration measurements. Nitrate levels as high as 126 μM, or 1-2 orders of magnitude higher than ambient concentrations, were measured in some areas of the reef flat. Nutrient fluxes were higher during the wet season (May-October) than the dry season (November-April). Dissolved inorganic nitrogen (DIN=NO3+NO2+NH4) and soluble reactive phosphorus (SRP) fluxes during the wet season were 4.4 and 0.2 mmoles m(-2) d(-1), respectively. With the increase population size and anthropogenic activities in Bolinao, an enhancement of SGD-derived nitrogen levels is likely. This could lead to eutrophic conditions in the otherwise oligotrophic waters surrounding the Santiago reef flat. |
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