气候变化领域集成服务门户(CCPortal): Effect of fire and thinning on fine-scale genetic structure and gene flow in fire-suppressed populations of sugar pine (Pinus lambertiana Dougl.)

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DOI	10.1016/j.foreco.2019.04.033
	Effect of fire and thinning on fine-scale genetic structure and gene flow in fire-suppressed populations of sugar pine (Pinus lambertiana Dougl.)
	Lind B.M.; North M.P.; Maloney P.E.; Eckert A.J.
发表日期	2019
ISSN	0378-1127
起始页码	115
结束页码	129
卷号	447
英文摘要	Historically, frequent, low-severity fires in dry western North American forests were a major driver of ecological patterns and processes, creating resilient ecosystems dominated by widely-spaced pine species. However, a century of fire-suppression has caused overcrowding, altering forest composition to shade-tolerant species, while increasing competition and leaving trees stressed and susceptible to pathogens, insects, and high-severity fire. Exacerbating the issue, fire incidence is expected to increase with changing climate, while fire season has been observed to begin earlier and last longer than historic trends. Forest thinning and prescribed fire have been identified as important management tools to mitigate these risks. Yet little is known of how thinning, fire, or their interaction affect contemporary evolutionary processes of constituent pine species that influence fitness and play an important role in the opportunity for selection and population persistence. We assessed the impact of widely used fuel reduction treatments on fine-scale gene flow on an ecologically important and historically dominant shade-intolerant pine species of the Sierra Nevada, Pinus lambertiana Dougl. Treatment prescription (no-thin-no-fire, thin-no-fire, and fire-and-thin) was found to differentially affect both fine-scale spatial and genetic structure as well as effective gene flow in this species. Specifically, the thin-no-fire prescription increases genetic structure (spatial autocorrelation of relatives) between adults and seedlings, while seed and pollen dispersal increase and decrease, respectively, as a function of increasing disturbance intensity. While these results may be specific to the stands at our study site, they indicate how assumptions relating to genetic effects based on spatial structure can be misleading (for instance, in many stands the presence or absence of spatial structure was not indicative the presence or absence of genetic structure). It is likely that these disequilibrated systems will continue to evolve on unknown evolutionary trajectories. The long-term impacts of management practices on reduced fitness from inbreeding depression should be continually monitored to ensure resilience to increasingly frequent and severe fire, drought, and pest stresses. © 2019 Elsevier B.V.
英文关键词	Fire; Forest management; Gene flow; Sierra Nevada; Sugar pine
语种	英语
scopus关键词	Ecology; Forestry; Genes; Plants (botany); Fine-scale genetic structure; Fuel reduction treatment; Gene flows; Population persistences; Seed and pollen dispersal; Sierra Nevada; Spatial autocorrelations; Treatment prescription; Fires; climate change; coniferous tree; dispersal; forest fire; forest management; gene flow; genetic structure; inbreeding depression; management practice; seedling; shade tolerance; thinning; Ecology; Fires; Flow; Forestry; Genes; Management; Pinus Lambertiana; Thinning; California; Sierra Nevada [California]; United States; Hexapoda; Pinus lambertiana
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155914
作者单位	Centre for Conservation Genetics and Department of Forest & Conservation Sciences, University of British Columbia, Vancouver, BC V6T1Z4, Canada; Integrative Life Sciences, Virginia Commonwealth University, Richmond, VA 23284, United States; USDA Forest Service Pacific Southwest Research Station, Davis, CA 95618, United States; Department of Plant Pathology and Tahoe Environmental Research Center, University of California, Davis, California, 95616, United States; Department of Biology, Virginia Commonwealth University, Richmond, VA 23284, United States
推荐引用方式 GB/T 7714	Lind B.M.,North M.P.,Maloney P.E.,et al. Effect of fire and thinning on fine-scale genetic structure and gene flow in fire-suppressed populations of sugar pine (Pinus lambertiana Dougl.)[J],2019,447.
APA	Lind B.M.,North M.P.,Maloney P.E.,&Eckert A.J..(2019).Effect of fire and thinning on fine-scale genetic structure and gene flow in fire-suppressed populations of sugar pine (Pinus lambertiana Dougl.).Forest Ecology and Management,447.
MLA	Lind B.M.,et al."Effect of fire and thinning on fine-scale genetic structure and gene flow in fire-suppressed populations of sugar pine (Pinus lambertiana Dougl.)".Forest Ecology and Management 447(2019).