Good genes, old age and life-history trade-offs
Good genes, old age and life-history trade-offs
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DOI：
10.1023/a:1006541701002
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发表时间：
1998-08-01
影响因子：
1.9
通讯作者：
Kokko, H
中科院分区：
文献类型：
--
作者：
Kokko, H
用配偶的年龄作为遗传质量的指标的可能性目前存在争议。早期的口头模型以及最近的一项模拟研究指出，女性选择老年男性是有益的，因为长寿意味着在当前环境下的生存能力。相比之下，年龄和适合度育种值之间的关系的定量遗传模型对这一机制提出了强烈的质疑。然而，目前的分析表明，这些怀疑主要是因为假设个体之间的所有差异都是由于适应度组成部分之间的分配差异造成的。这忽略了条件作为一个整体变化的可能性。相反，当考虑到条件的持续变异性并假设分配时的最优反应规范时，研究表明，在所有年龄段都可以很容易地建立生存与遗传质量或适应能力之间的关联。另一方面，研究结果也表明，口头论证的有效性是有限的，如果低质量的个人应该在生存方面投入更多资金，可能会产生反例。因此，老年指标问题的解决需要详细说明对生活史特征的约束。
The possibility of using old age of a mate as an indicator of genetic quality is currently controversial. Early verbal models as well as a recent simulation study noted that female choice for old males is beneficial because longevity indicates viability in the current environment. In contrast, a quantitative genetic model of the relationship between age and breeding value of fitness casts strong doubts on the mechanism. The present analysis shows, however, that these doubts are mainly the result of assuming that all variation among individuals arises from differences in allocation between components of fitness. This neglects the possibility of variability in condition as a whole. Instead, when allowing for persistent variability in condition and assuming optimal reaction norms in allocation, it is shown that correlations between survival and genetic quality or fitness can easily be established at all ages. On the other hand, the results also suggest that the validity of verbal arguments is limited, and counterexamples can be generated where low-quality individuals should invest more in survival. Therefore, resolution of the old age indicator problem requires specification of the constraints acting on life-history characteristics.