Dissertation Research: Separating the Effect of History and Ecology on the Bigeography of Day-geckos (Phelsuma): Evidence from mtDNA Analysis

论文研究：分离历史和生态对白壁虎 (Phelsuma) 地理学的影响：mtDNA 分析的证据

• 批准号: 9016403
• 负责人: James Bull
• 金额: $ 1.2万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-02-01 至 1993-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9016403&HistoricalAwards=false
• 关键词: Dissertation; Research; Separating; Effect; History

The relative effects of history, dispersal and ecology on the community structure of island systems of arboreal day geckos in the genus Phelsuma will be investigated. Restriction enzyme analysis of mtDNA will be used to distinguish between these effects. First, phylogeny of the genus will be compared with biogeography and physical history. Second, maternal inheritance patterns of mtDNA will be used to identify genotypes on recently emerged islands and determine whether these genotypes evolved in situ or represent dispersal events. This will provide a lower estimate of colonization rate. Third, maternal inheritance patterns of mtDNA will again be exploited to reconstruct the colonization history of the granitic Seychelles by P. sundbergi and P. astriata. This information will be used to determine the influences founder effects and ecological interactions have had in producing observed body size patterns. Preliminary results indicate that the Seychelles were originally "colonized" by two distantly related ancestors. The colonist leading to P. astriata was a close relative to P. lineata; the colonist leading to P. sundbergi was close relative to P. madagascariensis and P. abbotti. Further work will include basic ecological studies, ecological comparisons with Anolis radiation, and phylogenetic comparisons with other taxa.

将调查历史、扩散和生态对黄柏属树栖壁虎岛系群落结构的相对影响。线粒体DNA的限制性内切酶分析将被用来区分这些影响。首先，将该属的系统发育与生物地理和物理历史进行比较。其次，mtDNA的母系遗传模式将被用来识别最近出现的岛屿上的基因类型，并确定这些基因类型是在原位进化的，还是代表扩散事件。这将提供一个较低的殖民率估计。第三，将再次利用mtDNA的母系遗传模式来重建P.sundbergi和P.astriata对花岗岩塞舌尔的殖民史。这些信息将被用来确定创始人效应和生态交互作用在产生观察到的体型模式方面所产生的影响。初步结果表明，塞舌尔群岛最初被两个远亲祖先“殖民”。通向华山松的殖民者与P.lineata有亲缘关系；通向sundbergi的殖民者与P.madagascariensis和P.abbotti有亲缘关系。进一步的工作将包括基础生态学研究，与Anolis Radiation的生态学比较，以及与其他类群的系统发育比较。