Effects of causeway construction on environment and biota of subtropical tidal flats in Okinawa, Japan

James Davis Reimer, Sung Yin Yang, Kristine N. White, Ryuji Asami, Kazuhiko Fujita, Chuki Hongo, Shingo Ito, Iori Kawamura, Isshu Maeda, Masaru Mizuyama, Masami Obuchi, Takashi Sakamaki, Katsunori Tachihara, Maiko Tamura, Akira Tanahara, Aika Yamaguchi, Holger Jenke-Kodama

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Okinawa, Japan is known for its high marine biodiversity, yet little work has been performed on examining impacts of numerous large-scale coastal development projects on its marine ecosystems. Here, we examine apparent impacts of the construction of the Kaichu-Doro causeway, which was built over 40. years ago. The causeway is a 4.75. km long embankment that divides a large tidal flat and has only two points of water exchange along its entire length. We employed quadrats, transects, sampling, visual surveys, and microbial community analyses combined with environmental, water quality data, and 1. m cores, at five stations of two paired sites each (one on each side of Kaichu-Doro) to investigate how the environment and biota have changed since the Kaichu-Doro was built. Results indicate reduction in water flow, and site S1 was particularly heavily impacted by poor water quality, with low diversity and disturbed biotic communities.

Original languageEnglish
Pages (from-to)153-167
Number of pages15
JournalMarine Pollution Bulletin
Issue number1-2
Publication statusPublished - 2015 May 15


  • Corophium
  • Marine environmental assessment
  • Okinawa
  • Serratia
  • Subtropical tidal flat

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science
  • Pollution


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