Abstract
An adult female accompanied by 8 ducklings of Mergus serrator and an female with 3 ducklings of M. merganser were observed swimming over Reservoir Iwamatsu on July 8 and 9, 1964. This reservoir, ca. 3 km long and ca. 800 m wide, lies in the central part of Hokkaido, being surrounded by summer forests of Betula Maximowiczii, Quercus mongolica, Ulmus Davidiana japonica, Cercidiphyllum japonicum, Tilia japonica, Acer mono, etc.; a drag road and a forest railroad run together along its eastern coast (Fig. 1).
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