Canalization of phenology in common terns: genetic and phenotypic variations in spring arrival date
Canalization of phenology in common terns: genetic and phenotypic variations in spring arrival date
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DOI：
10.1093/beheco/ars214
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发表时间：
2013-05-01
影响因子：
2.4
通讯作者：
Charmantier, Anne
中科院分区：
文献类型：
--
作者：
Arnaud, Coline M.;Becker, Peter H.;Charmantier, Anne
进化潜力取决于重要的适应性行为和生活史特征（如物候）所显示的加性遗传方差。然而，这些性状的遗传变异可能在整个生命周期内变化。使用一个长期的研究（1994-2008年）的到达日期从春季迁移的长寿的普通燕鸥（燕鸥），我们研究了变化的方差，这一关键的物候特征在整个生殖阶段（之前，期间和之后的第一次繁殖事件）。基于来自1232个个体的5315个记录，到达繁殖地的日期在整个繁殖阶段表现出表型和加性遗传方差的显着下降。这种物候特征的渠化和选择性消失在生殖阶段是解释这些下降的假设。渠化揭示了显着减少的表型和加性遗传变异在进行性生殖阶段。生存力分析否定了选择性消失假说。到达日期的遗传力也随着生殖阶段的增加而下降（从0.23到0.11）。最后，到达日期是根据繁殖力的选择，有经验的育种家，表明目前的影响，通过繁殖力的选择。这些结果强调了微调的定量遗传学研究如何揭示行为特征的渠道化，反映过去和现在的选择力，并改进预测进化潜力。
Evolutionary potential is dependent on the additive genetic variance displayed by important adaptive behavioral and life-history traits, such as phenology. However, the genetic variance of such traits may vary over the life span. Using a long-term study (1994-2008) of arrival date from spring migration in the long-lived common tern (Sterna hirundo), we examined changes in variances of this key phenological trait across reproductive stages (before, during, and after the first breeding event). Based on 5315 records from 1232 individuals, arrival date at the breeding grounds exhibited significant declines in phenotypic and additive genetic variances across reproductive stages. Canalization of this phenological trait and selective disappearances across reproductive stages are hypotheses to explain these declines. Canalization was revealed by significant reductions in phenotypic and additive genetic variations at progressive reproductive stages. Viability analyses rejected the selective disappearance hypothesis. Heritability of arrival date also declined with reproductive stage (from 0.23 to 0.11). Finally, arrival date was under fecundity selection for experienced breeders, suggesting a current influence on canalization via fecundity selection. These results highlight how fine-tuned quantitative genetic investigations can reveal canalization in behavioral traits, reflecting past and present selective forces, and refining predictive evolutionary potential.