Individual variation in reaction norms but no directional selection in reproductive plasticity of a wild passerine population.
Individual variation in reaction norms but no directional selection in reproductive plasticity of a wild passerine population.
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DOI：
10.1002/ece3.8582
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发表时间：
2022-03
影响因子：
2.6
通讯作者：
Schroeder J
中科院分区：
文献类型：
--
作者：
Chik HYJ;Estrada C;Wang Y;Tank P;Lord A;Schroeder J
在植物-昆虫-食虫鸟类食物链中，气候的方向性变化可能导致不匹配的物候，从而可能影响选择压力。表型可塑性的时间繁殖，其特点是反应规范斜率，可以帮助最大限度地提高健身时，面对较早的猎物出现。在温带雀形目中，树萌芽的时间通过毛虫物候和由此产生的食物丰富度模式影响雏鸡的食物供应。因此，树萌芽的时间可能作为一个更直接的代理线索产卵的时间。育种可塑性的进化潜力依赖于可遗传变异，而可遗传变异是以个体变异为基础的，但对个体可塑性变异的研究很少。在这里，我们测试了产蛋日期-萌芽日期和窝卵数-产蛋日期反应范数，并检查了1）反应范数截距和斜率的个体间方差;以及2）这些截距和斜率的选择差异和梯度。使用橡树（栎属）萌芽和蓝山雀（Cyanistes caeruleus）繁殖的长期数据，我们应用受试者内中心化来检测反应规范，然后通过二元随机回归来量化反应规范属性及其适应性协方差的个体间方差。个体在产蛋日期-萌芽日期和窝卵数-产蛋日期反应规范的截距和斜率上存在显著差异，并且对于较早的产蛋日期和较大的窝卵数（截距）存在方向选择，但不存在可塑性（斜率）。我们发现，个体有自己的调节产卵和窝卵大小的机制。本研究进一步支持了鸟类表型可塑性的个体差异。在植物-昆虫-食虫鸟类食物链中，气候的方向性变化可能导致不匹配的物候，从而可能影响选择压力。在这里，我们发现个体蓝山雀在产卵和窝卵大小可塑性方面表现出变化，并且选择推动了更早的产卵日期和更大的窝卵大小，但不会影响可塑性。本研究进一步支持了鸟类表型可塑性的个体差异。
In the plant–insect–insectivorous bird food chain, directional changes in climate can result in mismatched phenology, potentially affecting selection pressures. Phenotypic plasticity in the timing of breeding, characterized by reaction norm slopes, can help maximize fitness when faced with earlier prey emergence. In temperate passerines, the timing of tree budburst influences food availability for chicks through caterpillar phenology and the resulting food abundance patterns. Thus, the timing of tree budburst might serve as a more direct proxy for the cue to time egg‐laying. The evolutionary potential of breeding plasticity relies on heritable variation, which is based upon individual variation, yet studies on individual variation in plasticity are few. Here, we tested for the laying date—budburst date and the clutch size—laying date reaction norms, and examined 1) the among‐individual variance in reaction norm intercepts and slopes; and 2) the selection differentials and gradients on these intercepts and slopes. Using long‐term data of oak (genus Quercus) budburst and blue tit (Cyanistes caeruleus) reproduction, we applied within‐subject centering to detect reaction norms, followed by bivariate random regression to quantify among‐individual variance in reaction norm properties and their covariance with fitness. Individuals significantly differed in intercepts and slopes of both laying date—budburst date and clutch size—laying date reaction norms, and directional selection was present for an earlier laying date and a larger clutch size (intercepts), but not on plasticity (slopes). We found that individuals have their own regimes for adjusting egg‐laying and clutch size. This study provides further support of individual variation of phenotypic plasticity in birds. In the plant—insect—insectivorous bird food chain, directional changes in climate can result in mismatched phenology, potentially affecting selection pressures. Here we found that individual blue tits display variation in egg‐laying and clutch size plasticity, and that selection has pushed for an earlier laying date and a larger clutch size but does not act on plasticity. This study provides further support of individual variation of phenotypic plasticity in birds.
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影响因子：
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作者：
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通讯作者：
EMBREE, DG
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