Journal of
Ecology and The Natural Environment

  • Abbreviation: J. Ecol. Nat. Environ.
  • Language: English
  • ISSN: 2006-9847
  • DOI: 10.5897/JENE
  • Start Year: 2009
  • Published Articles: 408

Full Length Research Paper

Effect of pH decline by acidified spring water on the growth of a submerged macrophyte, Egeria densa (Hydrocharitaceae) in the Kurohashi River, Japan

Kazuya Takahashi1,3* and Takashi Asaeda1,2
1Graduate School of Science and Engineering, Saitama University, Japan. 2Institute for Environmental Science and Technology, Saitama University, Japan. 3255 Shimo-Okubo, Sakura-ku, Saitama City, 338-8570 Japan.
Email: [email protected]

  •  Accepted: 30 January 2012
  •  Published: 28 February 2012

Abstract

A decline in pH shifts the equilibrium balance of HCO3- -free CO2 towards a regime dominated by free CO2 in the water. Based on the phenomenon, the effect of different pH values on the growth of a submerged macrophyte Egeria densa was investigated in an acidified spring-fed stream in Japan. The growth rate of E. densa during its developing period was found to negatively correlate to water pH (p<0.05). This suggested that a decline of pH in the stream induced by an acidified spring promotes the growth rate of E. densa.

 

Key words: Submerged macrophyte, Egeria densa, acidified spring water, pH.

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