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Journal of Environmental Information Science Vol.36 No.5 (2008年)
[pp.61-68]
A New Perspective toward Understanding the Role of Massive Migratory Waterfowl with regard to Winter Phytoplankton Bloom
Guangwei HUANG （The University of Tokyo）
Abstract:
The role of migratory waterfowl flocks in influencing water quality of lakes or lagoons has not been sufficiently studied. In this study, we examined water quality characteristics of two water bodies; Lake Mikata and Sakata Lagoon. Both are used as the wintering ground by a large number of waterfowl flocks and are registered Ramsar Sites. It was found that waterfowl impact manifested its role in winter in Sakata Lagoon where the winter bird populations were large relative to the size of the body of water and the annual nutrient level was shifting upward. Moreover, an indicator was proposed to judge the degree of waterfowl impact and a countermeasure to alleviate the possible adverse effect of waterfowl was discussed.
Key Word:
waterfowl, wintering, Lake Mikata, Sakata Lagoon, winter bloom