Predictors of early survival in Soay sheep: cohort-, maternal- and individual-level variation
Predictors of early survival in Soay sheep: cohort-, maternal- and individual-level variation
复制标题
索伊羊早期存活的预测因子：群体、母体和个体水平的变异
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Pemberton
中科院分区：
文献类型：
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作者：
O. Jones;M. Crawley;J. Pilkington;J. Pemberton
对人口动态的人口统计理解要求对影响存活率的过程有所了解--人口比率受个人、母亲和队列层面不同参数的影响。很少有人尝试划分这些参数类型中的每一种对人口学的影响。在这里，我们使用来自圣基尔达岛的Soay绵羊(Ovis Aries)野生种群的数据来探索这些参数类型对早期存活的相对重要性。我们证明，发生在个体层面和母体层面的变异的重要性远远超过发生在队列层面的变异。个体和母亲水平中最重要的变量分别是出生体重和母亲年龄类别。这项工作强调了在生态人口学中使用基于个体的模型的重要性，因此，我们告诫不要只关注人口过程的研究。
A demographic understanding of population dynamics requires an appreciation of the processes influencing survival—a demographic rate influenced by parameters varying at the individual, maternal and cohort level. There have been few attempts to partition the variance in demography contributed by each of these parameter types. Here, we use data from a feral population of Soay sheep (Ovis aries), from the island of St Kilda, to explore the relative importance of these parameter types on early survival. We demonstrate that the importance of variation occurring at the level of the individual, and maternally, far outweighs that occurring at the cohort level. The most important variables within the individual and maternal levels were birth weight and maternal age class, respectively. This work underlines the importance of using individual based models in ecological demography and we, therefore, caution against studies that focus solely on population processes.