Abstract:
: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 (~6.6) of regenerated nutrients. Dissolved inorganic P (DIP) in the water reached 4μM 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.
journal_name
Mar Pollut Bulljournal_title
Marine pollution bulletinauthors
Ferrera CM,Watanabe A,Miyajima T,San Diego-McGlone ML,Morimoto N,Umezawa Y,Herrera E,Tsuchiya T,Yoshikai M,Nadaoka Kdoi
10.1016/j.marpolbul.2016.02.025subject
Has Abstractpub_date
2016-04-15 00:00:00pages
237-48issue
1eissn
0025-326Xissn
1879-3363pii
S0025-326X(16)30089-3journal_volume
105pub_type
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