Environmental change reduces body condition, but not population growth, in a high‐arctic herbivore,Ecology Letters

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Environmental change reduces body condition, but not population growth, in a high‐arctic herbivore
Ecology Letters ( IF 7.6 ) Pub Date : 2020-11-13 , DOI: 10.1111/ele.13634
Kate Layton‐Matthews ₁ , Vidar Grøtan ₁ , Brage Bremset Hansen ₁ , Maarten J. J. E. Loonen ₂ , Eva Fuglei ₃ , Dylan Z. Childs ₄

Affiliation

Environmental change influences fitness‐related traits and demographic rates, which in herbivores are often linked to resource‐driven variation in body condition. Coupled body condition‐demographic responses may therefore be important for herbivore population dynamics in fluctuating environments, such as the Arctic. We applied a transient Life‐Table Response Experiment (‘transient‐LTRE’) to demographic data from Svalbard barnacle geese (Branta leucopsis), to quantify their population‐dynamic responses to changes in body mass. We partitioned contributions from direct and delayed demographic and body condition‐mediated processes to variation in population growth. Declines in body condition (1980–2017), which positively affected reproduction and fledgling survival, had negligible consequences for population growth. Instead, population growth rates were largely reproduction‐driven, in part through positive responses to rapidly advancing spring phenology. The virtual lack of body condition‐mediated effects indicates that herbivore population dynamics may be more resilient to changing body condition than previously expected, with implications for their persistence under environmental change.

中文翻译：

在高弧度草食动物中，环境变化会降低身体状况，但不会降低人口增长

环境变化会影响与健身相关的特征和人口统计率，而在草食动物中，这通常与身体条件的资源驱动型变化有关。因此，耦合的人体条件-人口统计学响应对于动荡的环境（例如北极）中的食草动物种群动态可能很重要。我们将短暂的生命表响应实验（'transient-LTRE'）应用于斯瓦尔巴特藤壶鹅（Branta leucopsis）的人口统计数据），以量化其对体重变化的种群动态响应。我们将人口的贡献从直接和延迟的人口统计学和身体状况介导的过程划分为人口增长的变化。身体状况的下降（1980-2017年）对生殖和雏鸡的存活产生了积极影响，对人口增长的影响可忽略不计。相反，人口增长率很大程度上是由繁殖驱动的，部分原因是对迅速发展的春季物候的积极反应。身体条件介导的效应的实际缺乏表明，草食动物种群动态可能比以前预期的更能适应不断变化的身体条件，这暗示着它们在环境变化下的持久性。

更新日期：2021-01-11

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