| 项目编号: | 1557147
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| 项目名称: | COLLABORATIVE RESEARCH: RUI: SINK OR SWIM: PHENOMIC AND TRANSCRIPTOMIC DIVERSIFICATION OF SCULPINS (TELEOSTEI: COTTIDAE) ENDEMIC TO LAKE BAIKAL, SIBERIA |
| 作者: | Michael Sandel
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| 承担单位: | University of West Alabama
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| 批准年: | 2016
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| 开始日期: | 2016-09-15
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| 结束日期: | 2019-08-31
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| 资助金额: | 468322
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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: | ancient lake
; baikal sculpin
; baikal
; world
; lake baikal
; evolutionary history
; lake
; lake habitat
; skeletal morphology
; ongoing research
; genomic inventory
; northernmost vertebrate radiation
; baikal biodiversity hotspot
; deep-water form
; body form
; genetic factor
; stream-living ancestor
; new information
; unprecedented opportunity
; extraordinary diversity
; rapid diversification
; short period
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| 英文摘要: | Ancient lakes are biodiversity hotspots, home to thousands of unique species with an extraordinary diversity of body forms and functions. With more than 1,500 species found nowhere else on the planet, Lake Baikal is an ideal environment to study the processes that resulted in creation of new species. The Baikal biodiversity hotspot is also a geographical anomaly, because global species diversity normally declines near polar regions. Despite Baikal's renown as the world's oldest, deepest, and largest lake, the evolutionary history of its unique species diversity remains poorly understood. This project examines the evolutionary history of sculpins, a group of primarily bottom-dwelling cold water fishes that colonized Baikal within a relatively short period of the lake's history. Baikal sculpins are uniquely adapted to life in an ancient lake, having evolved multiple open-water and deep-water forms. This project is focused on identifying the molecular basis for such variation, including gene sequences that evolve through generations and gene-expression changes that occur during development. New information gained from this study can be compared to ongoing research on fishes from other ancient lakes, in order to identify unifying processes that explain adaptation in these unique ecosystems.
Baikal sculpins represent the world's northernmost vertebrate radiation within an ancient lake ecosystem, with at least 33 species estimated to have evolved within the past two million years. Rapid diversification of skeletal morphology and body composition suggests that this clade has undergone ecological release from a stream-living ancestor, but phylogenetic analysis has thus far been limited to a single genetic locus. A genomic inventory of Baikal sculpins will be generated through systematic surveys of all lake habitats and the surrounding watershed. Tributaries to Baikal will also be sampled in the search for a putative ancestral sculpin population. A time-calibrated species tree will be generated from sequence variants at presumed neutral (RADseq) and functional (RNAseq) loci. Gene expression phenotypes will be mapped on the phylogeny to infer relative rates of phenotypic and ecological change. If a putative ancestral population is discovered in the tributaries to Lake Baikal, this system will offer an unprecedented opportunity to understand the genetic factors that predispose certain groups to adaptive radiation. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/90955
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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: | |
Michael Sandel. COLLABORATIVE RESEARCH: RUI: SINK OR SWIM: PHENOMIC AND TRANSCRIPTOMIC DIVERSIFICATION OF SCULPINS (TELEOSTEI: COTTIDAE) ENDEMIC TO LAKE BAIKAL, SIBERIA. 2016-01-01.
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