Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15274 |
Spruce beetle outbreak was not driven by drought stress: Evidence from a tree‐ring iso‐demographic approach indicates temperatures were more important | |
Jessika M. Pettit; Steve L. Voelker; R. Justin DeRose; Julia I. Burton | |
2020-07-31 | |
发表期刊 | Global Change Biology |
出版年 | 2020 |
英文摘要 | Climate change has amplified eruptive bark beetle outbreaks over recent decades, including spruce beetle (Dendroctonus rufipennis ). However, for projecting future bark beetle dynamics there is a critical lack of evidence to differentiate how outbreaks have been promoted by direct effects of warmer temperatures on beetle life cycles versus indirect effects of drought on host susceptibility. To diagnose whether drought‐induced host‐weakening was important to beetle attack success we used an iso‐demographic approach in Engelmann spruce (Picea engelmannii ) forests that experienced widespread mortality caused by spruce beetle outbreaks in the 1990s, during a prolonged drought across the central and southern Rocky Mountain region. We determined tree death date demography during this outbreak to differentiate early‐ and late‐dying trees in stands distributed across a landscape within this larger regional mortality event. To directly test for a role of drought stress during outbreak initiation we determined whether early‐dying trees had greater sensitivity of tree‐ring carbon isotope discrimination (∆13C) to drought compared to late‐dying trees. Rather, evidence indicated the abundance and size of host trees may have modified ∆13C responses to drought. ∆13C sensitivity to drought did not differ among early‐ versus late‐dying trees, which runs contrary to previously proposed links between spruce beetle outbreaks and drought. Overall, our results provide strong support for the view that irruptive spruce beetle outbreaks across North America have primarily been driven by warming‐amplified beetle life cycles whereas drought‐weakened host defenses appear to have been a distant secondary driver of these major disturbance events. |
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/286609 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Jessika M. Pettit,Steve L. Voelker,R. Justin DeRose,等. Spruce beetle outbreak was not driven by drought stress: Evidence from a tree‐ring iso‐demographic approach indicates temperatures were more important[J]. Global Change Biology,2020. |
APA | Jessika M. Pettit,Steve L. Voelker,R. Justin DeRose,&Julia I. Burton.(2020).Spruce beetle outbreak was not driven by drought stress: Evidence from a tree‐ring iso‐demographic approach indicates temperatures were more important.Global Change Biology. |
MLA | Jessika M. Pettit,et al."Spruce beetle outbreak was not driven by drought stress: Evidence from a tree‐ring iso‐demographic approach indicates temperatures were more important".Global Change Biology (2020). |
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