Colonization and diversification dynamics in ancient lake species flocks inferred from meta-analyses on freshwater gastropods

从淡水腹足动物荟萃分析推断古代湖泊物种群的定殖和多样化动态

• 批准号: 324310660
• 负责人: Dr. Björn Stelbrink
• 金额: --
• 依托单位: Institut für Tierökologie und Spezielle Zoologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/324310660?language=en
• 关键词: Colonization; diversification; dynamics; ancient; lake

Ancient lakes are key sources of biodiversity and hotspots of endemism. Their age (>100,000 years) suite them well for studying past colonization histories and processes of intra-lacustrine diversification/speciation. Main factors affecting speciation can be extrinsic or intrinsic and do often interact. The most important extrinsic factors driving the generation of biodiversity are major geological, limnological or climatic changes and related lake-level fluctuations. However, studying the impact of extrinsic and intrinsic factors on rates of diversification requires a well-understood geological and climatic history of the respective lake system. It further warrants suitable model systems and preferably complete molecular phylogenies plus statistical methods that allow to estimate diversification rates from time-calibrated molecular phylogenies.The main goal of this proposal is to identify main extrinsic factors driving speciation processes in ancient lake gastropods from the Miocene to the late Pleistocene on a broad spatiotemporal scale by performing a meta-analysis across seven major ancient lakes. Meta-analyses include generating molecular phylogenies, time-calibrated phylogenies, diversification-rate analyses and equilibrium analyses (identifying the carrying capacity of the lake), and linking environmental changes and diversification/speciation. These analyses are mainly based on published DNA sequences, but are also accompanied by additional sequences obtained in the course of this project. Performing such meta-analyses among different taxonomic groups allows for the comparison of diversification rates among different groups in the same environment (lake) and among the same groups (genera, families) inhabiting different lake systems.The present proposal provides a novel interdisciplinary approach for ancient lake studies by combining evolutionary, geological and environmental data obtained during the course of the project and from published studies. It is the first attempt to study diversification patterns in ancient lakes in a comparative framework on a global scale. Results obtained from this project will provide insights into modes and tempo of speciation in several gastropod groups and the impact of potential extrinsic factors on diversification and may form the basis for further meta-analyses in other invertebrate and vertebrate groups.Inferring the timeframe of major evolutionary (speciation) events by using time-calibrated phylogenies for all target groups will further help understanding the uncertain and discontinuous limnological history of some of these lakes. Moreover, because of the lack of (older) fossils in many lakes, the approach of using molecular (DNA) data of recent taxa in a combination with time-calibrated trees based on external rates (or fossil calibration if available) may be of great interest for both palaeontologists and geologists.

古代湖泊是生物多样性的主要来源和地方性热点。它们的年龄（> 10万年）非常适合研究过去的殖民历史和湖内多样化/物种形成过程。影响物种形成的主要因素可以是外在的或内在的，并且经常相互作用。推动生物多样性产生的最重要的外在因素是重大的地质、湖沼或气候变化以及相关的湖面波动。然而，研究外在和内在因素对多样化速度的影响，需要充分了解各湖泊系统的地质和气候历史。它进一步保证合适的模型系统，最好是完整的分子生物学加上统计方法，允许估计多样化率从时间校准的分子生物学。该建议的主要目标是确定主要的外在因素驱动古湖泊腹足类物种形成过程从中新世到晚更新世在广泛的时空尺度上进行荟萃分析，在七个主要的古湖泊。元分析包括生成分子生物学、时间校准生物学、多样化率分析和平衡分析（确定湖泊的承载能力），以及将环境变化与多样化/物种形成联系起来。这些分析主要基于已发表的DNA序列，但也伴随着在本项目过程中获得的额外序列。在不同的分类群体之间进行这样的荟萃分析，可以比较不同群体在同一环境（湖泊）和相同的群体（属，科）之间的多样化率居住在不同的湖泊system.The目前的建议提供了一个新的跨学科的方法，结合进化，地质和环境的数据，在项目的过程中，并从已发表的研究古湖泊研究。这是第一次尝试在全球范围内的比较框架内研究古湖泊的多样性模式。从这个项目中获得的结果将提供对几个腹足类物种形成的模式和克里思以及潜在外在因素对多样化的影响的深入了解，并可能成为其他无脊椎动物和脊椎动物群体进一步荟萃分析的基础。（物种形成）事件，对所有目标群体进行校准的湖沼成因分析，将进一步有助于了解其中一些湖泊的不确定和不连续的湖沼历史。此外，由于缺乏（旧）化石在许多湖泊中，使用最近的分类群的分子（DNA）数据与基于外部速率（或化石校准，如果可用）的时间校准树相结合的方法可能是古生物学家和地质学家的极大兴趣。

项目成果

Historical faunal exchange between the Pontocaspian Basin and North America

• DOI: 10.1002/ece3.5602
• 发表时间: 2019-08
• 期刊: Ecology and Evolution
• 影响因子: 2.6
• 作者: Justine Vandendorpe;Christiaan G C van Baak;Björn Stelbrink;Diana Delicado;C. Albrecht;T. Wilke

Forgotten for decades: Lake Lanao and the genetic assessment of its mollusc diversity

被遗忘数十年：拉瑙湖及其软体动物多样性的遗传评估

• DOI: 10.1007/s10750-018-3666-0
• 发表时间: 2019
• 期刊: Hydrobiologia
• 影响因子: 2.6
• 作者: Stelbrink;von Rintelen;Albrecht;Clewing
• 通讯作者: Clewing