Phosphorus as a driver of nitrogen limitation and sustained eutrophic conditions in Bolinao and Anda, Philippines, a mariculture-impacted tropical coastal area

MARINE POLLUTION BULLETIN

卷:105

Article

Ferrera, Charissa M.¹  Watanabe, Atsushi¹  Miyajima, Toshihiro²  San Diego-McGlone, Maria Lourdes³  Morimoto, Naoko²  Umezawa, Yu⁴  Herrera, Eugene⁵  Tsuchiya, Takumi⁶  Yoshikai, Masaya¹  Nadaoka, Kazuo¹ 

[1] Tokyo Inst Technol, Grad Sch Informat Sci & Engn, Dept Mech & Environm Informat, O-okayama 2-12-1 W8-13 Meguro, Tokyo 1528552, Japan

[2] Univ Tokyo, Atmosphere & Ocean Res Inst, Marine BiogeochemGrp, Kashiwanoha 5-1-5, Kashiwa, Chiba 2778564, Japan

[3] Univ Philippines, Inst Marine Sci, Quezon City 1101, Philippines

[4] Nagasaki Univ, Fac Fisheries, 1-14 Bunkyo, Nagasaki 8528521, Japan

[5] Univ Philippines, Inst Civil Engn, Quezon City 1101, Philippines

[6] Japan Int Cooperat Agcy, Tokyo 1028012, Japan

关键词: Mariculture;    Eutrophication;    Fish feed;    Phosphorus;    Nutrient ratios;    Bolinao;   

DOI  :  10.1016/j.marpolbul.2016.02.025

来源: Elsevier

【 摘 要 】

The dynamics of nitrogen (N) and phosphorus (P) was studied in mariculture areas around Bolinao and Anda, Philippines to examine its possible link to recurring algal blooms, hypoxia and fish kills. They occur despite regulation on number of fish farm structures in Bolinao to improve water quality after 2002, following a massive fish kill in the area. Based on spatiotemporal surveys, coastal waters remained eutrophic a decade after imposing regulation, primarily due to decomposition of uneaten and undigested feeds, and fish excretions. Relative to Redfield ratio (16), these materials are enriched in P, resulting in low N/P ratios(similar to 6.6) of regenerated nutrients. Dissolved inorganic P (DIP) in the water reached 4 mu M during the dry season, likely exacerbated by increase in fish farm structures in Anda. DIP enrichment created an N-limited condition that is highly susceptible to sporadic algal blooms whenever N is supplied from freshwater during the wet season. (C) 2016 Elsevier Ltd. All rights reserved.

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