Bigger is not always better: Viability selection on body mass varies across life stages in a hibernating mammal.
Bigger is not always better: Viability selection on body mass varies across life stages in a hibernating mammal.
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DOI：
10.1002/ece3.7304
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发表时间：
2021-04
影响因子：
2.6
通讯作者：
Martin JGA
中科院分区：
文献类型：
--
作者：
Jebb AHM;Blumstein DT;Bize P;Martin JGA
体重通常被视为过去获得资源和未来生存和生殖成功的代理。然而，体重与生存或生殖之间的联系可能因年龄和性别而异。值得注意的是，在选择分析中很少考虑到这一点。体重的选择可能是主要的目标占青少年生存，直到繁殖，但可能会削弱招募后。男性和女性在如何利用资源进行繁殖和生存方面也往往存在差异。通过对黄腹土拨鼠（Marmota flaviventer）的体重和年生存率进行长期研究，我们发现，在招募前的最初几年，体重处于稳定的生存力选择之下，随着年龄的增长和动物的成熟，这种选择变成了正向选择。我们没有发现任何证据表明，不同年龄组的体重的可行性选择性别之间的差异。通过调查跑步速度和身体质量之间的联系，我们发现，逃避捕食者的能力是不一致的年龄段，并遵循二次关系，在年轻的年龄。总体而言，我们的研究结果表明，成熟的年龄组表现出传统的模式积极的可行性选择的身体质量，预期在冬眠的哺乳动物，但质量在生命的第一年受到稳定的选择，这可能来自额外的捕食压力，否定了最大的身体质量的好处。我们的研究强调了在关键年龄（或生活）阶层中解开选择压力对性状的重要性。在选择分析中很少考虑体重和生存率之间的年龄特异性联系。在我们的研究中，我们展示了冬眠哺乳动物黄腹土拨鼠（Marmota flaviventer）的体重选择如何随年龄变化，从年轻时的稳定选择到老年时的定向选择。我们还表明，捕食年轻人可能提供了一种机制，通过量化最大跑步速度和体重之间的关系，在所有年龄的选择行为
Body mass is often viewed as a proxy of past access to resources and of future survival and reproductive success. Links between body mass and survival or reproduction are, however, likely to differ between age classes and sexes. Remarkably, this is rarely taken into account in selection analyses. Selection on body mass is likely to be the primary target accounting for juvenile survival until reproduction but may weaken after recruitment. Males and females also often differ in how they use resources for reproduction and survival. Using a long‐term study on body mass and annual survival in yellow‐bellied marmots (Marmota flaviventer), we show that body mass was under stabilizing viability selection in the first years of life, before recruitment, which changed to positive directional selection as age increased and animals matured. We found no evidence that viability selection across age classes on body mass differed between sexes. By investigating the link between running speed and body mass, we show that the capacity to escape predators was not consistent across age classes and followed a quadratic relationship at young ages only. Overall, our results indicate that mature age classes exhibit traditional patterns of positive viability selection on body mass, as expected in a hibernating mammal, but that mass in the first years of life is subjected to stabilizing selection which may come from additional predation pressures that negate the benefits of the largest body masses. Our study highlights the importance to disentangle selection pressures on traits across critical age (or life) classes. Age‐specific links between body mass and survival are rarely taken into account in selection analyses. In our study, we show how selection on body mass changes with age in a hibernating mammal, yellow‐bellied marmots (Marmota flaviventer), from stabilizing selection at young ages to directional at older. We also show that predation on young individuals may provide a mechanism by which selection acts by quantifying the relationship between maximum running speed and body mass at all ages
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影响因子：
1.7
作者：
Blumstein, DT;Runyan, A;Daniel, JC
通讯作者：
Daniel, JC
影响因子：
3.3
作者：
Charlton, Benjamin D.;Reby, David;McComb, Karen
通讯作者：
McComb, Karen
影响因子：
4.8
作者：
Barbraud, C;Johnson, AR;Bertault, G
通讯作者：
Bertault, G
影响因子：
2.5
作者：
HALEY, MP;DEUTSCH, CJ;LEBOEUF, BJ
通讯作者：
LEBOEUF, BJ
影响因子：
3.4
作者：
Douhard, Frederic;Gaillard, Jean-Michel;Lemaitre, Jean-Francois
通讯作者：
Lemaitre, Jean-Francois