セイタカシギの二雌トリオ I. トリオ形成の過程

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  • Bigamous Trios in the Black-winged Stilt Himantopus himantopus himantopus: I. Pathways to form Bigamous Trios
  • Bigamous trios in the Black-winged stilt Himantopus himantopus himantopus (1) Pathways to form bigamous trios

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Six cases of bigamous trios in the Black-winged Stilt Himantopus himantopus himantopus were studied during 1997-2006. One cause for the occurrence of bigamous trios is that postbreeding groups composed of a parent and a female offspring of the previous year, or that of a family and an unrelated female, have not dissolved by the next breeding season. Under conditions of a female-biased sex ratio in the non-breeding season, some females may chose bigamous trios as one of three mating options. In one trio, one female left the trio just before egg-laying, after they began to defend the nesting territory. Two bigamous trios made a joint nest, respectively. One bigamous trio made two simultaneous nests. One bigamous trio made a joint nest in one year and two simultaneous nests the following year. One bigamous trio made three nests successively.

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  • 山階鳥類学雑誌

    山階鳥類学雑誌 40 (2), 73-82, 2009

    公益財団法人 山階鳥類研究所

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