Prenatal maternal effects appear to be insensitive to experimental or natural environmental variation

Prenatal maternal effects appear to be insensitive to experimental or natural environmental variation
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产前母体效应似乎对实验或自然环境变化不敏感

DOI:
10.1111/1365-2435.12896
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发表时间:
2017
期刊:
影响因子:
5.2
通讯作者:
Thomson C
Thomson C
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Thomson C

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In many birds, hatching asynchrony is a common phenomenon, primarily driven by patterns of incubation behaviour. However, experimental results in blue tits (Cyanistes caeruleus) have shown that asynchrony is reduced by intrinsic properties of later eggs that accelerate prenatal development.These intrinsic differences between early and late eggs could be driven by changes in resource availability to females, which are then passively passed onto the egg. Alternatively, it may be due to an anticipatory maternal effect, wherein some signal or resource is actively placed within the egg, which is beneficial to those eggs laid late within the clutch.In order to distinguish between these hypotheses we designed a supplementary feeding experiment, wherein females were provided with food at certain times during the laying phase. This had no discernible effect on development rate, or other egg characteristics, consistent with anticipatory maternal effects.Using a larger dataset we also tested whether natural environmental variation (weather) during egg formation affected maternal investment in eggs. Similarly, egg characteristics were found to be relatively insensitive to the environmental variation, supporting the experimental results.A lay summary is available for this article.
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