Long-Term Dynamics of Freshwater Red Tide in Shallow Lake in Central Japan

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概要

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• Objective: The aim of this study is to clarify the long-term dynamics of the red tide occurring in Lake Kawaguchi. Methods: The measurement of environmental factors and water sampling were carried out monthly at a fixed station in Lake Kawaguchi's center basin from April 1993 to March 2004. On June 26, 1995, the horizontal distribution of Peridinium bipes was investigated using a plastic pipe, obtaining 0〜1-m layers of water column samples at 68 locations across the entire lake. Results: P. bipes showed an explosive growth and formed a freshwater red tide in the early summer of 1995, when the nutrient level was higher than those in the other years, particularly the phosphate concentration in the surface layer. The dissolved total phosphorus (DTP) concentration was sufficient for P. bipes growth in that year. In the study of its horizontal distribution, P. bipes was found at all the locations. The numbers of cells per milliliter ranged from 67 to 5360, averaging 1094±987 cells/ml, with particularly high densities along the northern shore. Since then, P. bipes has annually averaged about 25 cells/ml in Lake Kawaguchi. Conclusion: We observed that the red tide caused by P. bipes correlates with a high DTP concentration in Lake Kawaguchi.

• 日本衛生学会の論文

著者

• Yoshida Norihiko

  Yamanashi Women's Junior Collage

• Kazama Futaba

  Department Of Ecosocial System Engineering University Of Yamanashi

• YOSHIZAWA Kazuya

  Yamanashi Institute for Public Health

• Hirabayashi Kimio

  Department Of Applied Biology Faculty Of Textile Science And Technology Shinshu University

• ARIIZUMI Kazunori

  Yamanashi Institute for Public Health

関連論文

• Survey on Negative Impact of Chironomid Midges (Diptera) on Bronchial Asthmatic Patients in a Hyper-eutrophic Lake Area in Japan
• Metabolic balance of streams draining urban and agricultural watersheds in central Japan
• Environmental change based on diatom assemblages from Lake Yamanaka at the northern foot of Mt, Fuji, Central Japan
• Long-Term Dynamics of Freshwater Red Tide in Shallow Lake in Central Japan
• Progress of eutrophication and change of chironomid fauna in Lake Yamanakako, Japan
• Temporal changes and vertical distribution of macrophytes in Lake Kawaguchi

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