Placing the Floridian Genetic Break for Nearshore Taxa into a Regional Phylogenetic Perspective Using Three Lineages of Marine Mussels

利用海洋贻贝的三个谱系将佛罗里达近岸类群的遗传断裂纳入区域系统发育视角

• 批准号: 0099084
• 负责人: Diarmaid O'Foighil
• 金额: $ 33.85万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-04-15 至 2004-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0099084&HistoricalAwards=false
• 关键词: Placing; Floridian; Genetic; Break; Nearshore

Understanding spatio-temporal patterns of biotic diversity represents one of the central challenges facing ecologists and systernatists. This challenge is particularly acute in the marine environment where we are only just now beginning to comprehend the evolutionary processes which have produced the epic diversity evident in tropical nearshore faunas. A central paradox in marine evolution is how speciation rates in many clades are sufficiently high to produce large sibling species complexes on geographic scales that are dwarfed by the dispersal potential of their planktonic larval stages. The aim of this project is to address how the Gulf-Atlantic genetic disjunction for regionally distributed Caribbean morphospecies scales relative to the genetic structuring experienced over the rest of their collective geographic ranges. Three distinct phylogenetic trajectories are hypothesized that hinge on whether the Gulf--Atlantic genetic disjunction for individual study taxa originated early in the history of the Miocene Suwannee Seaway, or postdated it's Pliocene closure, and whether or not genetic cohesiveness has been maintained across oceanic barriers to dispersal. These hypotheses will be tested using three exemplar mytilid morphospecies chosen on the basis of their appropriate geographic ranges, ecological abundance in distinct coastal habitats, availability of reference congeners on the Pacific side of the isthmus of Panama, and possession of rapidly evolving paternally -transmitted mitochondrial lineages. Mitochondrial and nuclear gene trees will be generated for population samples spanning the southeastern Florida genetic break, the oceanic dispersal barrier to Bermuda, and representative locations in the Caribbean Basin. Sampling of Caribbean/eastern Pacific congeners will allow the identification of transisthmian reference geminate species and provide a meaningful temporal perspective for the intraspecific gene tree topologies. The project promises to yield important new insights into the nature and origin of biotic diversity in both this regional fauna and in the broader marine environment.

了解生物多样性的时空模式是生态学家和系统主义者面临的核心挑战之一。在海洋环境中，这一挑战尤其严重，在海洋环境中，我们才刚刚开始理解在热带近海动物区系中产生的史诗般多样性的进化过程。海洋进化中的一个中心悖论是，许多进化枝中的物种速率如何足够高，可以在地理尺度上产生大型兄弟姐妹物种复合物，这些尺度因其浮游幼虫阶段的分散潜力而相形见war。 该项目的目的是解决与区域分布的加勒比形形形量表的海湾 - 大西洋遗传分离相对于其余的集体地理范围中经历的遗传结构的尺度。假设三种不同的系统发育轨迹可以取决于中新世Suwannee Seaway的历史早期的海湾 - 大西洋遗传分离是起源于早期的，还是已更新后的上新世关闭，以及是否已维持了整个海洋障碍物的遗传性障碍。这些假设将根据其适当的地理范围，在沿海栖息地不同的生态丰度，巴拿马地峡太平洋地区的参考同源物的可用性以及快速发展的Paternally Empernally Envorly take fransnally Envicallallallallallallallallallallallial -Miteage的含有的参考文献。将生成线粒体和核基因树，用于跨越佛罗里达州东南部基因破裂，海洋分散屏障的人口样本以及加勒比海盆地的代表位置。加勒比海/东太平洋同源物的采样将允许识别跨性别的参考物种，并为种内基因树拓扑提供有意义的时间视角。该项目有望在该区域动物区系和更广泛的海洋环境中对生物多样性的性质和起源产生重要的新见解。