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- W1986687690 abstract "スズメPasser montanusの数が減っているのではないか,という声を,近年,各所で耳にする.そこで本研究では,スズメの個体数に関する記述および数値データを集め,スズメの個体数が本当に減少しているかどうか,減っているとしたらどれくらい減っているのかを議論した.その結果,現在のスズメの個体数は1990年ごろの個体数の20%から50%程度に減少したと推定された.1960年代と比べると減少の度合いはさらに大きく,現在の個体数は当時の1/10程度になった可能性がある.今後,個体数をモニタリングするとともに,個体数を適切に管理するような方策をとる必要があるだろう." @default.
- W1986687690 created "2016-06-24" @default.
- W1986687690 creator A5066432062 @default.
- W1986687690 date "2009-01-01" @default.
- W1986687690 modified "2023-10-18" @default.
- W1986687690 title "The decline in population size of the Tree Sparrow Passer montanus in Japan" @default.
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- W1986687690 doi "https://doi.org/10.3838/jjo.58.161" @default.
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