Fluctuations in population density and breeding performance of the Rufous Turtle Dove, Streptopelia orientalis, in Hokkaido.

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  • 北海道におけるキジバトの生息密度と繁殖成功率の変動
  • ホッカイドウ ニ オケル キジバト ノ セイソク ミツド ト ハンショク セイ

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Abstract

The Rufous Turtle Dove, Streptopelia orientalis, is a summer visitor, occurring from late March to late November in Naganuma, Hokkaido. The population density of doves showed slight fluctuations in the period 1976-1981. The breeding season from the first egg-laying stage to the last fledging stage lasted 7 months, from early April to late October. The incubation period ranged from 14 to 17 days (15.6±0.6 days, n=126; mean±S.D.) and the nestling period from 14 to 19 days (16.6±1.2 days, n=126). The breeding peak coincided with the germination period of soybean in the years 1976 to 1978. At this time, the number of nests with young was larger and the damage to soybean was higher than those in the period 1980-1983. Overall hatching rate of eggs throughout the 8-year period was 54%, fledging out rate 74% and breeding rate (young fledged from the eggs laid) 40%.

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