Collaborative Research: A unique window into the ecology of Cretaceous forests during the rise of angiosperms

合作研究：了解被子植物兴起期间白垩纪森林生态的独特窗口

• 批准号: 1655973
• 负责人: Cynthia Looy
• 金额: $ 21.96万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-05-15 至 2023-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1655973&HistoricalAwards=false
• 关键词: Collaborative; Research; unique; window; into

Flowering plants first appeared approximately 140 million years ago, during the age of dinosaurs. Flowering plants rapidly diversified and spread around the globe and evolved a variety of life forms that added to the ecological complexity of forests. This project investigates a crucial interval of this transition, ~75 million years ago, by studying a series of exceptionally preserved fossil floras from southern New Mexico, which existed under a wet tropical paleoclimate. These studies will provide important insights into forest evolution in tropical climates, the timing and patterns of ecological expansion of flowering plants, the habitats of dinosaurs and early mammals, and the history of vegetation for the western interior of North America. Most of these plant fossils collected this research represent species new to science and can provide important historical records for living lineages. The project provides training for students from diverse backgrounds. It also has several major initiatives for education and public outreach, including the development, testing, and dissemination of lesson plans for science teachers about the rise of flowering plants and modern forests. This project will use extensive paleontological field studies, fossil collections, and new quantitative techniques to generate extensive reconstructions of late Campanian forests from fossilized leaves, wood, seeds and fruits. By using newly developed sampling and analytical techniques, these studies will generate reconstructions of the diversity and ecological structure of the paleo forests. The fossil floras are from the Jose Creek Member of the McRae Formation in south-central New Mexico, which was located 200 km inland of the Western Interior Seaway. The diversity and community structure of the fossil forests will be reconstructed using spatial distributions of plant species across the landscape, while the functional ecology of the plants will be reconstructed by measuring traits of leaves, wood, and seeds/fruits that are reflective of life form, physiology, growth rate, and reproductive strategy. This information, when combined with analyses of climatically similar Cretaceous, Cenozoic, and extant floras, will be used to test hypotheses about: 1) the community structure and roles of major clades in Campanian floras; 2) the functional ecology of Cretaceous angiosperms; and 3) how the ecological structure of forests has changed through time in warm-wet climates. The functional trait-based approach used will link extant and paleo-ecology, and have broad applicability to understanding ecological radiations and community turnover following key evolutionary innovations.

开花植物首次出现于大约 1.4 亿年前的恐龙时代。开花植物迅速多样化并传播到全球各地，并进化出多种生命形式，增加了森林生态的复杂性。该项目通过研究新墨西哥州南部一系列保存完好的化石植物群，对这一转变的一个关键时期（大约 7500 万年前）进行了调查，这些植物群存在于潮湿的热带古气候下。这些研究将为热带气候下的森林演化、开花植物生态扩张的时间和模式、恐龙和早期哺乳动物的栖息地以及北美西部内陆植被的历史提供重要的见解。这项研究收集的大多数植物化石代表了科学上的新物种，可以为现存的谱系提供重要的历史记录。该项目为来自不同背景的学生提供培训。它还制定了几项教育和公共宣传重大举措，包括为科学教师制定、测试和传播有关开花植物和现代森林兴起的课程计划。该项目将利用广泛的古生物学实地研究、化石收集和新的定量技术，利用化石树叶、木材、种子和水果对坎帕尼亚晚期森林进行广泛的重建。通过使用新开发的采样和分析技术，这些研究将重建古森林的多样性和生态结构。这些植物群化石来自新墨西哥州中南部麦克雷组的何塞溪段，位于西部内陆航道 200 公里处。化石森林的多样性和群落结构将利用整个景观中植物物种的空间分布来重建，而植物的功能生态将通过测量反映生命形式、生理学、生长速度和繁殖策略的叶子、木材和种子/果实的特征来重建。这些信息与气候相似的白垩纪、新生代和现存植物区系的分析相结合，将用于检验以下假设：1）坎帕尼亚植物区系中主要分支的群落结构和作用； 2）白垩纪被子植物的功能生态学； 3）在暖湿气候下，森林的生态结构如何随时间变化。所使用的基于功能性状的方法将把现存生态学和古生态学联系起来，并且对于理解关键进化创新之后的生态辐射和群落更替具有广泛的适用性。