Chick Development and Asynchroneous Hatching in the Zebra Finch (Taeniopygia guttata castanotis)
Autor: | Hans-Joachim Bischof, Maki Ikebuchi, Toshikazu Hasegawa, Kazuo Okanoya |
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Rok vydání: | 2017 |
Předmět: |
0106 biological sciences
Aging animal structures media_common.quotation_subject sibling competition Zoology parental care hatching asynchrony Biology 010603 evolutionary biology 01 natural sciences Competition (biology) Nest Animals 0501 psychology and cognitive sciences 050102 behavioral science & comparative psychology Hatchling Zebra finch development media_common chick down feathers Ecology Hatching Reproduction 05 social sciences Fledge zebra finch biology.organism_classification embryonic structures behavior and behavior mechanisms Animal Science and Zoology Finches Paternal care Taeniopygia |
Zdroj: | Zoological science. 34(5) |
ISSN: | 0289-0003 |
Popis: | The mode of hatching in birds has important impacts on both parents and chicks, including the costs and risks of breeding for parents, and sibling competition in a clutch. Birds with multiple eggs in a single clutch often begin incubating when most eggs are laid, thereby reducing time of incubation, nursing burden, and sibling competition. In some songbirds and some other species, however, incubation starts immediately after the first egg is laid, and the chicks thus hatch asynchronously. This may result in differences in parental care and in sibling competition based on body size differences among older and younger chicks, which in turn might produce asynchronous development among siblings favoring the first hatchling, and further affect the development and fitness of the chicks after fledging. To determine whether such processes in fact occur in the zebra finch, we observed chick development in 18 clutches of zebra finches. We found that there were effects of asynchronous hatching, but these were smaller than expected and mostly not significant. Our observations suggest that the amount of care given to each chick may be equated with such factors as a camouflage effect of the down feathers, and that the low illumination within the nest also complicates the determination of the hatching order by the parents. |
Databáze: | OpenAIRE |
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