| 项目编号: | 1501198
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| 项目名称: | DISSERTATION RESEARCH: Phylogeny, biogeography, and convergent evolution in a radiation of Southeast Asian Rock Geckos (Cnemaspis Strauch, 1887). |
| 作者: | Jack Sites
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| 承担单位: | Brigham Young University
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| 批准年: | 2014
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| 开始日期: | 2015-05-01
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| 结束日期: | 2017-04-30
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| 资助金额: | USD16335
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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: | region
; non-adaptive radiation
; evolutionary study
; preliminary phylogeny
; convergent evolution
; genus cnemaspis
; southeast asia
; well-supported multilocus time-calibrated phylogeny
; rock gecko
; cnemaspis species diversification
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| 英文摘要: | Southeast Asia is one of the most intriguing and understudied biodiversity hotspots in the world. A prominent geological feature of this area is the Sunda Shelf, which is currently submerged beneath the South China Sea and underlies the Malay Archipelago. This region has a complex geological and climatic history, and serves as an excellent system to study drivers of biotic diversification. One group that occurs throughout this region is the rock gecko genus Cnemaspis. Theses geckos live on various substrates including different types of vegetation and rocks, including limestone, which is heavily mined in Southeast Asia for the production of cement. Mining and clearance of rainforest comprise serious threats to the unique biodiversity of this region. Studies of the endemic organisms of this region can contribute to conservation planning through the discovery of cryptic species and identification of local areas of high species diversity. This kind of knowledge is crucial to the implementation of effective science-based conservation strategies. This study will also further our understanding of the processes of speciation and adaptation to unique local environments, and the long-term accumulation of biodiversity which make this part of Asia so rich in endemic species. Portions of this research will be used to train undergraduates, and to develop a public display about biodiversity and species discovery at the Bean Life Science Museum at Brigham Young University.
The genus Cnemaspis is widespread throughout Southeast Asia and is one of the most species-rich gecko genera in the region, with 54 described species. These presumed low vagility geckos live on a variety of substrates and vary in ecomorphology; and the clade is characterized by a number of micro-endemics, making it a great system for evolutionary study. In this project we will: (1) generate a well-supported multilocus time-calibrated phylogeny of the genus and test spatial and temporal divergence across the Sunda Shelf; (2) evaluate whether the polytomy in the preliminary phylogeny for the genus is 'hard' or 'soft', and if the former, whether it is an adaptive or non-adaptive radiation; and (3) investigate the effects on Cnemaspis species diversification (e.g. speciation and extinction rates) derived from the convergent evolution of ecomorphological characters. Currently one mitochondrial gene and three nuclear gene sequences resolve well-supported clades towards the tips of the tree, but fail to resolve deeper nodes. To test the hard vs. soft polytomy hypotheses, a 'Next Generation' sequence-capture method will be used to generate hundreds of loci. From this dataset a phylogenetic tree will be constructed to explicitly test alternative biogeographic hypotheses for colonization of parts of Sundaland, as well as test morphological disparity through time (DTT), convergent adaptive regime shifts, and evolution of ecomorphological characters. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/94758
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Jack Sites. DISSERTATION RESEARCH: Phylogeny, biogeography, and convergent evolution in a radiation of Southeast Asian Rock Geckos (Cnemaspis Strauch, 1887).. 2014-01-01.
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