Investigation of the hydrogeographical evolution of southwest China based on freshwater crab biogeography

基于淡水蟹生物地理学的西南地区水文地理演化研究

• 批准号: 268250802
• 负责人: Privatdozent Dr. Sebastian Klaus
• 金额: --
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/268250802?language=en
• 关键词: Investigation; hydrogeographical; evolution; southwest; China

In fluviatile environments, allopatry between drainages can be considered as a major driver of diversification in aquatic organisms. While separation between drainages can be an active process via dispersal over land, in many cases the rearrangement of river systems isolated populations and caused subsequent speciation.This project deals with the historical biogeography of the diverse primary freshwater crabs of Southwest China (family Potamidae). These inhabit a highly dynamic landscape that experienced major geographical changes during the last ten million years due to drainage rearrangements in the course of the uplift of the Tibetan plateau. Dating of these drainage re-arrangements remains a difficult endeavour in geosciences, even though this information is crucial to understand landscape evolution and can help to estimate uplift rates. Given that these geographical changes are often associated with speciation, these events are likely to be reflected by phylogenetic patterns. I intend to extrapolate the timing of drainage rearrangements in Southwest China (Sichuan, Chongqing) based on a dated freshwater crab phylogeny.(1) I ask wether colonization of the Sichuan basin with potamid freshwater crabs occurred (a) via Yunnan from the south, and/or (b) via the lower Yangtze from the east. In the first case colonization most likely correlates with the final capture of the upper Yangtze, in the latter case freshwater crabs most likely spread upstream with the successive captures of the middle Yangtze tributaries, or reversal of the middle Yangtze, respectively.(2) Based on time-calibrated phylogeny of the freshwater crabs I try to answer if reversal of the middle Yangtze is an old, Miocene event that occurred during initial rise of the Tibetan plateau and adjacent areas, or if it is not older than Pliocene.This project will be embedded in a larger joint research project lead by the Chengdu Institute of Biology, Chinese Academy of Sciences, targeting evolution of aquatic organisms and drainage development in Southwest China.

在河流环境中，水系之间的异地分布可被视为水生生物多样化的主要驱动力。虽然水系之间的分离可能是一个通过陆地扩散的主动过程，但在许多情况下，河流系统的重新排列使种群隔离并导致随后的物种形成。这些栖息在一个高度动态的景观，经历了重大的地理变化，在过去的一千万年中，由于排水重新安排的过程中，青藏高原的隆起。这些排水重新安排的日期仍然是一个困难的努力，在地球科学，即使这些信息是至关重要的了解景观演变，并有助于估计隆起率。鉴于这些地理变化往往与物种形成有关，这些事件很可能反映在系统发育模式中。我打算根据淡水蟹类的一个年代，推断中国西南部（四川、重庆）水系重排的时间。(1)我想知道，淡水蟹类在四川盆地的定居是（a）从南方经由云南，还是（B）从东方经由长江下游。在第一种情况下，殖民化最有可能与长江上游的最终捕获，在后一种情况下，淡水蟹最有可能传播上游连续捕获长江中游支流，或逆转长江中游，分别。(2)基于淡水蟹类的时间标定的演化史，我试图回答长江中游的逆转是否是一个古老的中新世事件，发生在青藏高原及其邻近地区的初始上升期间，或者它是否不早于上新世。本项目将嵌入中国科学院成都生物研究所牵头的一个更大的联合研究项目，以水生生物进化和西南地区水系开发为目标。