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Limnology

, Volume 15, Issue 3, pp 201–211 | Cite as

Ecological impacts of the 2011 Tohoku Earthquake Tsunami on aquatic animals in rice paddies

  • Yasuo Mukai
  • Tomoyo Suzuki
  • Wataru Makino
  • Tsubasa Iwabuchi
  • Mika So
  • Jotaro Urabe
Special Feature Freshwater biodiversity in human-dominated landscapes

Abstract

The 2011 Tohoku Earthquake Tsunami hit the Pacific coast of eastern Japan on March 11, 2011 and disturbed various ecosystems, including rice paddies along the coast. In Miyagi Prefecture, located in the Tohoku Region, a total of 12685 ha, or about 11.5 % of the rice paddies, were inundated and damaged by the tsunami. Although rice paddies are artificially constructed, they have long been used by many kinds of aquatic animals as habitats. To assess impacts of the 2011 Tohoku Earthquake Tsunami on aquatic animals inhabiting the rice paddies, census surveys were conducted at inundated and non-inundated rice paddies at six sites along the coast of Miyagi Prefecture from June to July 2012. This was 30–60 days after the first transplanting of rice seedling in inundated rice paddies following the tsunami. In the surveys a total of 100 aquatic animal taxa, 72 from inundated and 86 from non-inundated rice paddies, were found. Although the taxonomic richness and composition differed among the sites, the total number of observations of walk dispersers and obligatory aquatic animals without resting stages were significantly lower in inundated than in non-inundated rice paddies. However, no notable difference was detected in taxonomic richness and the total number of observations of flight dispersers and obligatory aquatic animals with resting stages between inundated and non-inundated rice paddies. The results showed that the tsunami had a substantial impact on freshwater animals but that restoration of the paddies for rice cultivation enhanced rapid recolonization by aquatic animals with high dispersal abilities and resting stages.

Keywords

Tsunami Rice paddies Aquatic animals Great East Japan Earthquake 

Notes

Acknowledgments

This study was financially supported by Mitsui & Co., Ltd. Environment Fund (F11-F1-020), Earthwatch Japan, and a Grant-in-Aid for Scientific Research B (No. 25291094) from the MEXT Japan to JU. We thank Shigeo Yasuda, Yukiho Ito, and participants of the citizen research program by Earthwatch Japan. We are grateful to the farmers who allowed us to investigate their paddies.

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Copyright information

© The Japanese Society of Limnology 2014

Authors and Affiliations

  • Yasuo Mukai
    • 1
  • Tomoyo Suzuki
    • 1
  • Wataru Makino
    • 1
  • Tsubasa Iwabuchi
    • 2
  • Mika So
    • 1
  • Jotaro Urabe
    • 1
  1. 1.Graduate School of Life SciencesTohoku UniversitySendaiJapan
  2. 2.Undergraduate School of Life SciencesToyo UniversityGunmaJapan

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