title: Nutrient inputs from submarine groundwater discharge on the Santiago reef flat, Bolinao, Northwestern Philippines.
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.
authors.affiliation: Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines. isabelsenal@gmail.com
authors.forename: Maria Isabel S
authors.initials: MI
authors.lastname: Senal
authors.forename: Gil S
authors.initials: GS
authors.lastname: Jacinto
authors.forename: Maria Lourdes
authors.initials: ML
authors.lastname: San Diego-McGlone
authors.forename: Fernando
authors.initials: F
authors.lastname: Siringan
authors.forename: Peter
authors.initials: P
authors.lastname: Zamora
authors.forename: Lea
authors.initials: L
authors.lastname: Soria
authors.forename: M Bayani
authors.initials: MB
authors.lastname: Cardenas
authors.forename: Cesar
authors.initials: C
authors.lastname: Villanoy
authors.forename: Olivia
authors.initials: O
authors.lastname: Cabrera
mesh_terms: D057894:Coral Reefs; D004784:Environmental Monitoring; D005618:Fresh Water / Q000737:chemistry*; D009584:Nitrogen / Q000032:analysis*; D010679:Philippines; D010758:Phosphorus / Q000032:analysis*; D012623:Seawater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen