Journal of Water and Environment Technology
Online ISSN : 1348-2165
ISSN-L : 1348-2165
Original Papers
Allelopathic Potential Against Microcystis aeruginosa by Emergent Macrophytes on Floating Beds
Fumihiko TAKEDA, Kazunori NAKANO, Yoshio AIKAWA, Osamu NISHIMURA, Yoshihiko SHIMADA, Shota FUKURO, Hitoshi TANAKA, Norio HAYASHI, Yuhei INAMORI
Author information
  • Fumihiko TAKEDA

    Graduate School of Engineering, Tohoku University, Japan

  • Kazunori NAKANO

    Graduate School of Engineering, Tohoku University, Japan

  • Yoshio AIKAWA

    Graduate School of Engineering, Tohoku University, Japan

  • Osamu NISHIMURA

    Graduate School of Engineering, Tohoku University, Japan

  • Yoshihiko SHIMADA

    Technology Development Division, Fujita Corporation, Japan

  • Shota FUKURO

    Technology Development Division, Fujita Corporation, Japan

  • Hitoshi TANAKA

    Center for Environmental Science in Saitama, Japan

  • Norio HAYASHI

    National History Museum and Institute, Chiba, Japan

  • Yuhei INAMORI

    Faculty of Symbiotic Systems Science, Fukushima University, Japan

Corresponding author

ORCID
Keywords: allelopathy, Carex dispalata, floating bed, Microcystis aeruginosa, Phragmites australis, Typha domingensis
JOURNAL FREE ACCESS

2011 Volume 9 Issue 4 Pages 371-380

Details
  • Published: 2011 Received: April 27, 2011 Available on J-STAGE: December 31, 2011 Accepted: August 23, 2011 Advance online publication: - Revised: -
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Abstract
The purpose of this study is to examine the allelopathic potential of emergent macrophytes in actual lakes or ponds. Water was collected around the roots of emergent macrophytes Phragmites australis, Carex dispalata and Typha domingensis vegetated on floating beds or areas without macrophytes in a pond every second month for a year, and examined by bioassay using Microcystis aeruginosa. The water at areas without macrophytes did not exhibit growth-inhibiting effect throughout the year, but almost all of the water collected at the floating beds with the emergent macrophytes had the effect when the macrophytes existed. These results showed an obvious tendency that the exhibition of the growth-inhibiting effect correlated with the existence of the emergent macrophytes. To confirm such effect observed in actual ponds, three kinds of macrophytes were cultured hydroponically in which the roots were submerged in water and their culture filtrates were collected. All of the culture filtrates showed allelopathically growth-inhibiting effect on M. aeruginosa. From the comparison between the bioassay results of the water in the pond and the culture filtrates, the growth-inhibiting effect shown by the water at the floating beds with the emergent macrophytes would be responsible for the allelopathic effect of the macrophytes.
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© 2011 Japan Society on Water Environment
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