PMID: 16615698Apr 18, 2006Paper

Verification of the silica deficiency hypothesis based on biogeochemical trends in the aquatic continuum of Lake Biwa-Yodo River-Seto Inland Sea, Japan

Ambio
Akira HarashimaTadao Toshiyasu

Abstract

The silica deficiency hypothesis holds that increases of still waters caused by hydraulic alterations and high nitrogen (N) and phosphorus (P) discharges enhance the growth of freshwater diatoms, which take up the dissolved silicate (DSi) supplied by natural weathering. The consequent decrease in the DSi supply to the sea is advantageous to flagellates (nonsiliceous and potentially harmful) but not to diatoms (siliceous and mostly benign) in coastal marine ecosystems. Verification of this hypothesis has been hampered by lack of relevant data, particularly in Asia. We investigated the aquatic continuum composed of Lake Biwa, the Yodo River, and the Seto Inland Sea, Japan, where the natural conditions make the silica deficiency less likely to emerge due to the inherently rich supply of DSi. The results showed that the silica was retained both in the lake and nearby the estuary. The relative dominance of diatom and flagellates could not be explained solely by the stoichiometric arguments but by the supportive discussion on the difference of their behavioral characteristics and the process nearby the estuary, where direct inputs of N and P and effluent Si enhanced diatom bloom, even though the Si/N ratio was lowered in the upstream...Continue Reading

Citations

Jun 3, 2008·Marine Pollution Bulletin·Mitsuru Hayashi, Tetsuo Yanagi
Mar 28, 2009·Trends in Ecology & Evolution·Anthony J RichardsonMark J Gibbons

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