Paleogenetics of Pleistocene Deep-Water Corals from the Mediterranean Sea: The Rise and Fall of Coral Populations within the Basin

地中海更新世深水珊瑚的古遗传学：盆地内珊瑚种群的兴衰

• 批准号: 0647612
• 负责人: Rhian Waller
• 金额: $ 20.72万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-02-01 至 2008-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0647612&HistoricalAwards=false
• 关键词: Paleogenetics; Pleistocene; Deep; Water; Corals

This project examines processes controlling deep-water coral dispersal through time inthe Mediterranean Sea, an area where many biogeographical barriers to gene flow impede the entrance and settlement of larvae over time. Until recently, only sub-fossil scleractinian Lophelia pertusa banks, reefs and mounds had been conclusively discovered (dated as late Pleistocene, ~11,000 years ago). Current hypotheses contend that this, and many other, species were isolated from thriving populations in the outer NE Atlantic by the Gibraltar Sill, and that the Mediterranean acted as a refuge for deep-water corals during the stresses of the Pleistocene, later becoming cut off by oceanographic conditions, and eventually dying out. However, in 2001 a thriving L. pertusa reef was discovered in the Ionian Sea, leading to many fundamental questions regarding the population dynamics and ecology of this species. In collaboration with international scientists our proposed work takes advantage of novel ancient DNA approaches on coral skeletons to investigate the genetic connectivity of sub-fossil and live deep-water coral mounds throughout the Mediterranean Sea, as well as their connection to the outer Atlantic Ocean, in order to enable us to answer fundamental questions regarding the ecology and phylogeography of deep-water corals in this region through time. This project will further our knowledge of the population dynamics of both the Mediterranean region, and of deep-water coral species and their reaction to the changes within the last 11,000 years. There are over 100,000 fishermen on 40,000 vessels that work within the confines of the Mediterranean Sea. Over the last 20 years stocks of many traditional fisheries in this area have been in rapid decline. With this decline in traditional fisheries, a move to exploit deeper water fisheries within the Mediterranean will occur soon, as already observed in the outer North Atlantic. Deep-water corals are firmly established as an important habitat for many commercial fish species, and in areas where deep-water fishing occurs (e.g. NE Atlantic, New Zealand, Australia) damage from commercial trawlers is evident. By providing essential information on the genetic connectivity, dispersal and colonization of Mediterranean deep-water corals, this project will allow a better understanding on these populations and allow for more informed decisions on designating marine protected areas. Results from this study will also be provided to the HMAP (The History of Marine Animal Populations) and FMAP (Future of Marine Animal Populations) projects, two of the major elements of the Census of Marine Life (CoML) program. This information will also provide insight into the role of climate on historic coral populations, and improve predictive models of population responses to future climate change.

本项目研究控制深水珊瑚扩散的过程，通过时间在地中海，一个地区，许多地理障碍基因流阻碍入口和解决的幼虫随着时间的推移。直到最近，只有亚化石石珊瑚Lophelia pertusa银行，珊瑚礁和土丘已被最终发现（晚更新世，约11，000年前）。目前的假说认为，这一物种和许多其他物种是通过直布罗陀海脊与东北大西洋外部繁荣的种群隔离开来的，地中海在更新世的压力期间充当了深水珊瑚的避难所，后来由于海洋条件而被切断，最终灭绝。然而，2001年，一个蓬勃发展的L。在爱奥尼亚海发现了pertusa珊瑚礁，导致了许多关于该物种的种群动态和生态学的基本问题。与国际科学家合作，我们拟议的工作利用珊瑚骨骼上的新型古代DNA方法来研究整个地中海的亚化石和活深水珊瑚土丘的遗传连接性，以及它们与外大西洋的连接，以便使我们能够回答有关该地区深水珊瑚生态和系统地理学的基本问题。该项目将增进我们对地中海区域和深水珊瑚物种的种群动态及其对过去11 000年变化的反应的了解。有超过10万名渔民在4万艘船只上在地中海范围内作业。过去20年来，该地区许多传统渔业的种群迅速减少。随着传统渔业的减少，不久将出现在地中海内开发深水渔业的趋势，正如在北大西洋外围已经观察到的那样。深水珊瑚已牢固地确立为许多商业鱼种的重要生境，在深水捕捞地区（例如东北大西洋、新西兰、澳大利亚），商业拖网渔船造成的损害很明显。通过提供有关地中海深水珊瑚的遗传联系、扩散和定殖的基本信息，该项目将有助于更好地了解这些种群，并有助于就指定海洋保护区作出更知情的决定。这项研究的结果也将提供给HMAP（海洋动物种群的历史）和FMAP（海洋动物种群的未来）项目，这是海洋生物普查（CoML）计划的两个主要组成部分。这些信息还将深入了解气候对历史珊瑚种群的作用，并改进种群对未来气候变化反应的预测模型。