| 项目编号: | 1601762
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| 项目名称: | DISSERTATION RESEARCH: Network heterogeneity and metapopulation persistence in Pseudomonas syringae |
| 作者: | Ellen Simms
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| 承担单位: | University of California-Berkeley
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| 批准年: | 2016
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| 开始日期: | 2016-05-01
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| 结束日期: | 2018-04-30
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| 资助金额: | 20396
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Biological Sciences - Environmental Biology
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| 英文关键词: | population
; network
; group
; weak network
; project
; metapopulation
; supervised independent research
; population network
; social network
; research approach
; metapopulation model
; heterogeneous network
; metapopulation persistence
; spatial heterogeneity
; population persistence
; network treatment
|
| 英文摘要: | Society is increasingly defined by networks - groups of individuals separated by small or large distances. Movement across space to connect groups determines the strength of a network, the rates at which information spreads (social networks) or individuals interact (population networks), and the extent to which events in one group affect events in another group. This project will use a new tool to determine how, when, and why connections among populations determine whether a population persists or goes extinct. Results of the project will improve conservation and management plans for populations that are increasingly isolated by changes in land use. Improved conservation plans will be particularly important for endangered species that persist within weak networks. The project will advance the training and education of a doctoral student, who has developed and will improve a new experimental tool. Investigators will make the design and use of this tool publicly accessible, contributing to a democratic scientific process in which researchers co-design and share equipment. Use of this research approach will be extended to undergraduate and middle school students through programs that provide supervised independent research.
This project will use a newly-developed experimental chamber to test directly both assumptions and predictions of existing metapopulation models; metapopulations are groups of linked populations. Bacterial populations cultured in chambers will be connected by corridors in a homogeneous lattice or a strongly heterogeneous arrangement. Both colonization and extinction rates will be controlled by manipulating corridor configurations and by disturbing populations with tetracycline, causing extinction. These manipulations will compare patch occupancy and metapopulation persistence in homogenous and heterogeneous networks across a gradient of extinction-to-colonization ratios. The researchers will next design network treatments that conform to lattice, random, exponential, and power-law distributions to identify the threshold extinction-to-colonization ratio at which bacterial populations can no longer persist. A final manipulation will create 'lonely' populations that are connected to a single neighbor and compare population persistence to that of counterpart populations connected to diverse nodes in a network. These experiments will improve understanding of the effects of spatial heterogeneity on ecological and evolutionary processes and identify appropriate conservation strategies for metapopulations comprising strong versus weak networks. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/92448
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Ellen Simms. DISSERTATION RESEARCH: Network heterogeneity and metapopulation persistence in Pseudomonas syringae. 2016-01-01.
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