Correlates of early reproduction and apparent fitness consequences in male Soay sheep.
Correlates of early reproduction and apparent fitness consequences in male Soay sheep.
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DOI：
10.1002/ece3.10058
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发表时间：
2023-05
影响因子：
2.6
通讯作者：
中科院分区：
文献类型：
--
作者：
生活史权衡在物种中普遍存在，并限制了生活史事件的时间，包括第一次繁殖的最佳年龄。然而，由于性别偏见的传播和遗传亲子关系推断的要求，关于雄性哺乳动物终身繁殖成功的研究很少。我们研究了苏格兰圣基尔达的自由生活的Soay羊（Ovis aries）种群中雄性动物早期生殖的相关性和明显的健康后果。我们调查了与早期繁殖成功相关的因素以及早期成功对生存和未来繁殖的明显后果。我们使用了遗传亲子关系推断，人口数据和个人形态测量收集了30多年。我们发现，在低密度人口规模的年份出生的个体早期繁殖成功率最高，单胞胎比双胞胎更有可能成功。在7个月大时成功繁殖的个体更有可能在第一个冬天存活下来。对于那些在第一个冬天幸存下来的个体来说，早期的繁殖成功与后来的繁殖成功无关。由于个体异质性影响育种成功，我们认为，个体质量的变化掩盖了这一群体早期繁殖的成本。我们的研究结果没有提供任何证据选择延迟年龄在繁殖雄性Soay羊。我们调查了与雄性Soay羊早期育种成功相关的因素，以及这种因素对生存和未来繁殖的影响。我们发现，出生在低密度群体中的个体具有最高的早期生命繁殖成功率。在第一年繁殖的个体更有可能在第一个冬天生存下来，但早期繁殖对它们未来的繁殖成功没有影响。
Life history trade‐offs are ubiquitous across species and place constraints on the timing of life history events, including the optimal age at first reproduction. However, studies on lifetime breeding success of male mammals are rare due to sex‐biased dispersal and the requirement for genetic paternity inferences. We studied the correlates and apparent fitness consequences of early life reproduction among males in a free‐living population of Soay sheep (Ovis aries) on St Kilda, Scotland. We investigated the factors associated with early breeding success and the apparent consequences of early success for survival and future reproduction. We used genetic paternity inferences, population data, and individual morphology measurements collected over 30 years. We found that individuals born in years with low‐density population size had the highest early life breeding success and singletons were more likely to be successful than twins. Individuals that bred successfully at 7 months were more likely to survive their first winter. For individuals that survived their first winter, early breeding success was not associated with later breeding success. As individual heterogeneity affects breeding success, we believe that variation in individual quality masks the costs of early reproduction in this population. Our findings provide no evidence for selection for delayed age at reproduction in male Soay sheep. We investigated the factors associated with early breeding success in male Soay sheep and the consequences of this for survival and future reproduction. We found that individuals born into low‐density populations had the highest early life breeding success. Individuals that bred in their first year were more likely to survive their first winter but breeding early had no effect on their future reproductive success.
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影响因子：
3.3
作者：
Froy H;Walling CA;Pemberton JM;Clutton-Brock TH;Kruuk LE
通讯作者：
Kruuk LE
影响因子：
6.5
作者：
COLE, LC
通讯作者：
COLE, LC
影响因子：
64.8
作者：
GRENFELL, BT;PRICE, OF;CLUTTONBROCK, TH
通讯作者：
CLUTTONBROCK, TH
影响因子：
4.8
作者：
CLUTTONBROCK, TH;GUINNESS, FE;ALBON, SD
通讯作者：
ALBON, SD
影响因子：
10
作者：
Brommer, JE
通讯作者：
Brommer, JE