Ecological study toward the vegetation management based on the dynamic regime theory for shallow lake ecosystem

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Ecological mechanism of the formation of large and dense vegetation beds dominated by Trapa japonica, a floating leaved plant, was studied in Lake Mikata, in order to obtain basic knowledge for vegetation management in shallow lakes. Remote sensing analyses revealed that the area of T. japonica bed in Lake Mikata has been increasing since 2006. The distribution of T. japonica beds within the lake was affected by the pattern of seed dispersal and entrance of saline water from a lower lake. Flow regime of tributary rivers can affect both these factors. The importance of the river management on the regime of lake ecosystems was suggested.