Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15142 |
The stress of Arctic warming on polar bears | |
Rudy Boonstra; Korryn Bodner; Curtis Bosson; Brendan Delehanty; Evan S. Richardson; Nicholas J. Lunn; Andrew E. Derocher; Pé; ter K. Molná; r | |
2020-06-10 | |
发表期刊 | Global Change Biology |
出版年 | 2020 |
英文摘要 | Arctic ecosystems are changing rapidly in response to climate warming. While Arctic mammals are highly evolved to these extreme environments, particularly with respect to their stress axis, some species may have limited capacity to adapt to this change. We examined changes in key components of the stress axis (cortisol and its carrier protein—corticosteroid binding globulin [CBG]) in polar bears (Ursus maritimus ) from western Hudson Bay (N = 300) over a 33 year period (1983–2015) during which time the ice‐free period was increasing. Changing sea ice phenology limits spring hunting opportunities and extends the period of onshore fasting. We assessed the response of polar bears to a standardized stressor (helicopter pursuit, darting, and immobilization) during their onshore fasting period (late summer–autumn) and quantified the serum levels of the maximum corticosteroid binding capacity (MCBC) of CBG, the serum protein that binds cortisol strongly, and free cortisol (FC). We quantified bear condition (age, sex, female with cubs or not, fat condition), sea ice (breakup in spring–summer, 1 year lagged freeze‐up in autumn), and duration of fasting until sample collection as well as cumulative impacts of the latter environmental traits from the previous year. Data were separated into “good” years (1983–1990) when conditions were thought to be optimal and “poor” years (1991–2015) when sea ice conditions deteriorated and fasting on land was extended. MCBC explained 39.4% of the variation in the good years, but only 28.1% in the poor ones, using both biological and environmental variables. MCBC levels decreased with age. Changes in FC were complex, but more poorly explained. Counterintuitively, MCBC levels increased with increased time onshore, 1 year lag effects, and in poor ice years. We conclude that MCBC is a biomarker of stress in polar bears and that the changes we document are a consequence of climate warming. |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/274369 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Rudy Boonstra,Korryn Bodner,Curtis Bosson,et al. The stress of Arctic warming on polar bears[J]. Global Change Biology,2020. |
APA | Rudy Boonstra.,Korryn Bodner.,Curtis Bosson.,Brendan Delehanty.,Evan S. Richardson.,...&r.(2020).The stress of Arctic warming on polar bears.Global Change Biology. |
MLA | Rudy Boonstra,et al."The stress of Arctic warming on polar bears".Global Change Biology (2020). |
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