日本に渡来する夏鳥の減少

概要

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In order to show the population trend of forest and wetland summer visitors to Japan, field observations, literature surveys, and questionnaire surveys were conducted in 1995-1997. Field observations and literature surveys showed that the number of seven species of summer visitors drastically declined in some areas of Japan: Black Paradise Flycatchers Terpsiphone atricaudata, Ashy Minivets Pericrocotus divaricatus, Yellow-breasted Buntings Emberiza aureola, Ruddy Kingfishers Halcyon coromanda, Brown Hawk Owls Ninox scutulata, Jungle Nightjars Caprimulgus indicus, and Porzana Crakes Porzana fusca. These seven species were the focus of questionnaires sent to the members of the Wild Bird Society of Japan. It was shown that all these species declined in many areas of Japan during the past 25 years, although the pattern of decline varied somewhat by species. Serious habitat destruction and deterioration did not occur in half of the study areas of six forest and grassland species. Longterm observation records showed that in many areas the number of species decreased in summer visitors but did not change or increased in residents. It seems that the population decline of summer visitors is mostly associated with habitat destruction in their wintering areas of Southeast Asia.
横浜国立大学の論文
1999-03-31