非繁殖期のオナガＣｙａｎｏｐｉｃａ　ｃｙａｎａの群れの行動圏と群れサイズの地域間の比較

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  • The home range and flock size of the Azure-winged Magpie <i>Cyanopica cyana</i> during the non-breeding season in Nagano Prefecture
  • ヒハンショクキ ノ オナガ Cyanopica cyana ノ ムレ ノ コウドウケン ト ムレ サイズ ノ チイキ カン ノ ヒカク

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The home ranges and flock sizes of the Azure-winged Magpie Cyanopica cyana were studied during the non-breeding season in the Ina area (ca. 800 m alt.) from 1977 to 1981 and in the Nobeyama area (ca. 1350 m alt.) from 1980 to 1983 in Nagano Prefecture, central Honshu, Japan. The climate of the Nobeyama area was more severe in winter than in the Ina area. In the Ina area, the average home range size of ten flocks was 135.1 ha, while in the Nobeyama area five flocks average home ranges of 287.6 ha. The fall, winter and spring ranges of one flock in Ina area almost completely overlapped, but the range of the single flock at Nobeyama area expanded during winter and contracted in spring. The home ranges of neighboring flocks partly, or largely overlapped. The average size of ten flocks at Ina was 28.7 birds, while the average of five flocks at Nobeyama was 16.4 birds. The size of the Ina flock decreased over time, but that of Nobeyama remained the same. Population density was 9.6 birds/at Ina and 4.2 birds/at Nobeyama. Flock sizes in both areas were unstable during October, and decreased gradually from November to April. The flock size was reduced from October to April by the rate of 33.5% at Ina and 31.4% at Nobeyama, respectively. The difference in the home ranges of the flocks in the two areas may result from environmental factors such as weather conditions and food availability during winter.

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