Laying date in the coot : effects of age and mate choice
Laying date in the coot : effects of age and mate choice
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母鸡产蛋日期：年龄和配偶选择的影响
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
A. J. Cavé
中科院分区：
文献类型：
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作者：
A. Perdeck;A. J. Cavé
1. 白骨顶的产蛋日期随雌雄白骨顶的年龄而提前。2. 雌性个体的产卵日期不同，但却相当稳定。在控制这些差异后，雌性年龄对产卵日期的影响仍然存在，而雄性年龄对产卵日期的影响消失。这意味着，随着年龄的增长，早期和晚期的雌性都提前了产卵日期。这也意味着雄性的年龄对产卵日期没有直接影响，但年长的雄性更有能力竞争早产卵的雌性。3. 从一个队列中选择性地失去晚育雌性是年龄和产卵日期之间相关性的潜在附加原因。然而，雌性的存活率与产卵日期无关，因此反驳了选择假说。4. 这些数据既不支持随着年龄的增长而增加的生殖努力（剩余生殖价值假说），也不支持早期和晚期雌性之间的生殖延迟差异（延迟生殖假说）作为随年龄增长而提前产卵日期的额外解释。因此，个体女性的这种进步被认为是由于质量的提高（成熟假说）。5. 雌虫产卵日期的重复性为0 ~ 32，但用母女回归估计的遗传力仅为0 ~ 02。这表明个体之间产蛋日期的差异主要是环境因素造成的。
1. Laying date in coots advanced with the age of both the male and the female. 2. Individual females had different but rather constant laying dates. After controlling for these differences, the effect of female age on laying date remained, but that of male age disappeared. This implies that both early and late females advanced their laying date when becoming older. It also implies that male age has no direct effect on laying date, but that older males are better able to compete for earlylaying females. 3. Selective loss of late-breeding females from a cohort is a potential additional cause for a correlation between age and laying date. However, female survival rate was independent of laying date, thus refuting the selection hypothesis. 4. The data supported neither increased reproductive effort with age (residual reproductive value hypothesis), nor differential delay of reproduction between early and late females (delayed reproduction hypothesis) as additional explanations for the advancement of laying date with age. This advancement in the individual female is therefore considered to be due to increasing quality (maturation hypothesis). 5. The repeatability of laying date in females was 0-32, but the heritability, estimated with daughter-mother regression, was only 0-02. This indicates that the variation in laying date between individuals is predominantly environmental.