Paleoecological and Paleoenvironmental Changes in Lagoon Notoro-Ko (Japan) during the Last 200 Years Based on Diatom Assemblages and Sediment Chemistry(<Featured Article>Earth Surface Processes, Natural Disasters and Historical Environmental Changes)

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概要

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• Siliceous microfossils (diatom and silicoflagellate) and CNS component in core sediment samples from Lagoon Notoro Qapan) were examined for evaluating natural climate and anthropogenic effects on lagoon environmental changes. Before the mid-19^<th> century, the water exchange between Lagoon Notoro and the Okhotsk Sea was maintained by a natural inlet. The lagoon ecology and environment were relatively stable. Since the late-19^<th> century, however, this inlet had been closed by sediment removal from a river valley due to deforestation. Consequently, the lagoon became low saline due to the limited water exchange and anoxic bottom water spread. The succession of dominant diatom taxa and chemical components were distinctly recorded in core sediment. Immediately after the excavation of an artificial inlet in 1974, the salinity reached the same level with the Okhotsk Sea and the anoxic bottom water began to disappear due to increasing water exchange rate. After the excavation the dominant diatom assemblages in Lagoon Notoro shifted to ice related and spring bloom taxa. The dominant taxa of each year were strongly related to the timing of lagoon ice melting. Furthermore, the changes of chemical oxygen demand (COD) in Lagoon Notoro and neighboring Lagoon Saroma relatively correspond to the changes of ice cover duration. The time required for the melting of lagoon ice is defined by the air pressure pattern over the northern North Pacific as a result of the Pacific Decadal Oscillation (PDO). Therefore we conclude that the ecology of Lagoon Notoro was affected by global climate changes.

• 2012-04-25

著者

• Seto Koji

  Research Center For Coastal Lagoon Environments Shimane University

• Saito Makoto

  Research & Development Division Kikkoman Corporation

• KIM Ju-Yong

  Geological & Environmental Hazards Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)

• Saito Makoto

  Research Center For Coastal Lagoon Environments Shimane University

• KATSUKI Kota

  Geological Division, Korea Institute of Geoscience and Mineral Resources

• NOGUCHI Takuro

  Center for Advanced Marine Core Research, Kochi University

• SONODA Takeshi

  Tokyo University of Agriculture, Faculty of bio-industry

• Katsuki Kota

  Geological Division Korea Institute Of Geoscience And Mineral Resources

• Noguchi Takuro

  Center For Advanced Marine Core Research Kochi University

• Sonoda Takeshi

  Tokyo University Of Agriculture Faculty Of Bio-industry

• Kim Ju-yong

  Geological Division Korea Institute Of Geoscience And Mineral Resources

• Seto Koji

  Research & Development Division, Nitto Kasei Co., Ltd.

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