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Genetic structure and connectedness of Southern Ocean pycnogonids (Chelicerata: Pycnogonida) in a changing environment

不断变化的环境中南大洋密齿类（Chelicerata：Pycnogonida）的遗传结构和连通性

基本信息

批准号：
172458604
负责人：
Dr. Christoph Held, Ph.D.
金额：
--
依托单位：
Leibniz-Institut zur Analyse des Biodiversitätswandels (LIB)
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2010
资助国家：
德国
起止时间：
2009-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/172458604?language=en
关键词：
Genetic structure connectedness Southern Ocean

项目摘要

Southern Ocean pycnogonids are abundant, diverse and highly endemic on an ocean basin scale. Despite some efforts in molecular evolutionary research on marine Antarctic invertebrates in recent years, the pycnogonids remain mostly unstudied. Hence, many questions concerning their evolutionary history remain and common zoogeographic hypotheses, e.g. the concept of circumpolar distribution, remain mostly untested. The aim of the proposed project is to analyse the genetic structure of pycnogonids with such a reported circumpolar distribution. Sequencing nuclear and mitochondrial genes, we first want to test whether the reported circumpolar distribution holds true or is just artifactual due to the presence of cryptic species. Second, for verified species, we aim at investigating the amount and direction of gene flow among populations using newly developed microsatellites and innovative bioinformatic approaches together with physical and biologcial oceanographic information on the Southern Ocean. In a third step, using the same DNA markers, we want to test whether shallow-water species on the Antarctic shelf have suffered more from past glaciation events compared to species with broad vertical distribution ranges since these may have escaped to the deep sea. In view of ongoing and upcoming environmental changes in the Southern Ocean as a result of a fast changing climate, our analyses of today’s intra- and interspecific genetic diversity of Antarctic Pycnogonida represent important baseline research for monitoring the response of Antarctic biota to changing conditions.

南大洋甲虫种类繁多，种类繁多，在洋盆尺度上高度特有。尽管近年来在南极海洋无脊椎动物的分子进化研究方面做了一些努力，但对拟脊椎动物的研究仍然很少。因此，关于它们的进化史的许多问题仍然存在，常见的动物地理学假说，如绕极分布的概念，大多仍未得到检验。拟议项目的目的是分析具有这种已报告的绕极分布的碧螺科的遗传结构。为了对核和线粒体基因进行测序，我们首先想测试所报道的绕极分布是真实的，还是由于神秘物种的存在而只是人为的。第二，对于已证实的物种，我们的目标是利用新开发的微卫星和创新的生物信息学方法，结合南大洋的物理和生物海洋学信息，调查种群间基因流动的数量和方向。在第三步中，使用相同的DNA标记，我们想要测试南极陆架上的浅水物种是否比垂直分布范围广的物种在过去的冰川事件中遭受的损失更大，因为这些物种可能已经逃往深海。鉴于气候快速变化导致南大洋正在发生和即将发生的环境变化，我们对今天南极金枪鱼的种内和种间遗传多样性的分析是监测南极生物群对变化条件的反应的重要基线研究。