气候变化领域集成服务门户(CCPortal): Whitebark pine (Pinus albicaulis) growth and defense in response to mountain pine beetle outbreaks

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DOI	10.1016/j.foreco.2019.117736
	Whitebark pine (Pinus albicaulis) growth and defense in response to mountain pine beetle outbreaks
	Kichas N.E.; Hood S.M.; Pederson G.T.; Everett R.G.; McWethy D.B.
发表日期	2020
ISSN	0378-1127
卷号	457
英文摘要	Whitebark pine (Pinus albicaulis) is a critical forest species of Northern Rocky Mountain upper subalpine ecosystems, yet little is known about the physiological response of whitebark pine to disturbance (e.g. fire, bark beetles, and pathogens) across a range of diverse environmental gradients. Resin-based defenses have long been recognized as the primary mechanism by which conifers respond to attack by bark beetles and pathogens and several studies have linked resin duct properties to survivorship during periods of increased beetle activity. However, to our knowledge, no studies have compared axial resin ducts in the secondary xylem of whitebark pine across pairs of living and dead whitebark pine trees to better understand survivorship following multiple disturbances including mountain pine beetle and white pine blister rust. We found a clear distinction in growth and defense characteristics between live and dead whitebark pine. Across our study sites on the Flathead Indian Reservation in northwestern Montana, live whitebark pine produced larger resin ducts with a greater annual investment in resin-based defenses than whitebark pine that died. Resin duct size, duct area, and relative duct area were all greater in live whitebark pine (by 56%, 48%, and 57%, respectively) and these were the most important variables influencing whitebark pine survivorship. In contrast, whitebark pine that had died grew faster over time (22% larger ring widths) than their live counterparts and also produced more resin duct structures (20% more ducts on average). Whitebark pine at our study sites exhibit differing strategies in the allocation of resources toward growth and defense, with the majority of survivors of recent disturbance investing more in defensive structures than growth. Our results support the idea that maintaining genetic variability and the associated suite of differing physiological traits promotes diverse response strategies to a complex array of biophysical and biological stressors that might leave a species vulnerable to extinction across its range. © 2019 Elsevier B.V.
关键词	Forestry Landforms Network security Physiological models Physiology Resins Defensive structure Environmental gradient Flathead Indian Reservation Mountain pine beetle Multiple disturbance Northern Rocky Mountains Physiological response Physiological trait Ducts beetle coniferous forest coniferous tree disturbance environmental gradient genetic variation growth physiological response subalpine environment survivorship Forestry Growth Physiology Pinus Heldreichii Pinus Mugo Resin Ducts Montana United States Coleoptera Coniferophyta Cronartium ribicola Kathetostoma giganteum Pinus albicaulis Pinus mugo Scolytinae
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133125
推荐引用方式 GB/T 7714	Kichas N.E.,Hood S.M.,Pederson G.T.,et al. Whitebark pine (Pinus albicaulis) growth and defense in response to mountain pine beetle outbreaks[J]. Forest Ecology and Management,2020,457.
APA	Kichas N.E.,Hood S.M.,Pederson G.T.,Everett R.G.,&McWethy D.B..(2020).Whitebark pine (Pinus albicaulis) growth and defense in response to mountain pine beetle outbreaks.,457.
MLA	Kichas N.E.,et al."Whitebark pine (Pinus albicaulis) growth and defense in response to mountain pine beetle outbreaks".457(2020).