Breeding biology of the Little Cuckoo Cuculus poliocephalus: a brood parasite specializing in one host species, the Japanese Bush Warbler Cettia diphone, in Honshu, Japan

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  • 本州におけるウグイスCettia diphoneに専門的に托卵するホトトギスCuculus poliocephalusの繁殖生態

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I investigated the breeding ecology of a brood parasite, the Little Cuckoo Cuculus poliocephalus, in central Honshu, Japan. In the study area cuckoos parasitized only one species, the Japanese Bush Warbler Cettia diphone. Bush Warblers began egg laying in mid-April and continued until July. Cuckoos arrived in the area during late May and began egg-laying in early June. The proportion of parasitized warblers' nests was 22% throughout the breeding season, but was 46% after cuckoo parasitism began. The reproductive success of cuckoos was only 3%, which may drive the high rate of nest parasitism. The cuckoo eggs were uniformly red-brown and mimicked the host eggs well. However, cuckoo eggs were noticeably larger than the host eggs. The incubation period for cuckoo eggs was about 14 days, which resulted in them hatched 1-2 days earlier than the host eggs. I video-recorded two cases in which a cuckoo laid an egg in a bush warbler's nest: laying took 18 seconds in one instance and 19 seconds in the other. Predation of host eggs by cuckoos was also recorded. Occasionally, partial loss of eggs in a brood occurred, which may have been the result of egg removal by cuckoos. Nineteen percent of bush warbler nests were deserted when parasitized and 22% when not-parasitized. It is thought that the Little Cuckoo has defeated the Japanese Bush Warbler in the ‘arms race’ by means of well-developed egg mimicry.

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Details 詳細情報について

  • CRID
    1390001204480364160
  • NII Article ID
    130004852976
  • DOI
    10.3838/jjo.60.78
  • ISSN
    18819710
    0913400X
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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