蓝鲨 Prionace glauca 的种群基因组学揭示了地中海和大西洋东北部的不同种群

IF 3.5 2区 生物学 Q1 EVOLUTIONARY BIOLOGY
Agostino Leone, Sophie Arnaud-Haond, Massimiliano Babbucci, Luca Bargelloni, Ilaria Coscia, Dimitrios Damalas, Chrystelle Delord, Rafaella Franch, Fulvio Garibaldi, David Macias, Stefano Mariani, Jann Martinsohn, Persefoni Megalofonou, Primo Micarelli, Natacha Nikolic, Paulo A. Prodöhl, Emilio Sperone, Marco Stagioni, Antonella Zanzi, Alessia Cariani, Fausto Tinti
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引用次数: 0

摘要

在过去几十年中,海洋顶级掠食者的数量急剧下降,三分之一的软骨鱼类目前濒临灭绝。大型中上层鲨鱼的可持续管理措施和保护计划需要有关种群遗传分化和人口连接的知识。在此,我们介绍地中海大青鲨(Prionace glauca,L. 1758)的案例,它通常是延绳钓渔业中的副渔获物,被世界自然保护联盟列为极度濒危物种。由于缺乏地中海内部以及该海盆与邻近的东北大西洋之间的种群结构和连接数据,对该物种的管理受到影响。在这里,我们通过基因组扫描分析评估了地中海和东北大西洋不同区域大青鲨的遗传多样性和空间结构。根据 14,713 个 ddRAD 衍生 SNPs 对 203 个标本进行基因分型后得出的配对遗传分化估计值(FST)显示,地中海采样地点内部以及地中海与东北大西洋之间存在微妙但显著的遗传差异。遗传差异表明地中海西部和东部大青鲨种群之间存在一定程度的人口独立性。此外,结果表明地中海和大西洋盆地之间的遗传联系有限,支持了直布罗陀海峡分隔出两个不同的大青鲨种群的假说。虽然繁殖互动可能有限,但微弱的遗传分化信号表明这些单元之间最近有共同的历史。因此,地中海大青鲨的功能可能类似于一个元种群,依赖于当地的人口统计过程和连接动态,其中来自大西洋的有限的当代基因流补充可能与目前监管不力的商业捕捞和大规模生态系统变化相互作用。总之,这些结果表明,有必要修改对这些极度濒危鲨鱼的管理划界。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Population Genomics of the Blue Shark, Prionace glauca, Reveals Different Populations in the Mediterranean Sea and the Northeast Atlantic

Population Genomics of the Blue Shark, Prionace glauca, Reveals Different Populations in the Mediterranean Sea and the Northeast Atlantic

Populations of marine top predators have been sharply declining during the past decades, and one-third of chondrichthyans are currently threatened with extinction. Sustainable management measures and conservation plans of large pelagic sharks require knowledge on population genetic differentiation and demographic connectivity. Here, we present the case of the Mediterranean blue shark (Prionace glauca, L. 1758), commonly found as bycatch in longline fisheries and classified by the IUCN as critically endangered. The management of this species suffers from a scarcity of data about population structure and connectivity within the Mediterranean Sea and between this basin and the adjacent Northeast Atlantic. Here, we assessed the genetic diversity and spatial structure of blue shark from different areas of the Mediterranean Sea and the Northeast Atlantic through genome scan analyses. Pairwise genetic differentiation estimates (FST) on 203 specimens genotyped at 14,713 ddRAD-derived SNPs revealed subtle, yet significant, genetic differences within the Mediterranean sampling locations, and between the Mediterranean Sea and the Northeast Atlantic Ocean. Genetic differentiation suggests some degree of demographic independence between the Western and Eastern Mediterranean blue shark populations. Furthermore, results show limited genetic connectivity between the Mediterranean and the Atlantic basins, supporting the hypothesis of two distinct populations of blue shark separated by the Strait of Gibraltar. Although reproductive interactions may be limited, the faint genetic signal of differentiation suggests a recent common history between these units. Therefore, Mediterranean blue sharks may function akin to a metapopulation relying upon local demographic processes and connectivity dynamics, whereby the limited contemporary gene flow replenishment from the Atlantic may interplay with currently poorly regulated commercial catches and large-scale ecosystem changes. Altogether, these results emphasise the need for revising management delineations applied to these critically endangered sharks.

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来源期刊
Evolutionary Applications
Evolutionary Applications 生物-进化生物学
CiteScore
8.50
自引率
7.30%
发文量
175
审稿时长
6 months
期刊介绍: Evolutionary Applications is a fully peer reviewed open access journal. It publishes papers that utilize concepts from evolutionary biology to address biological questions of health, social and economic relevance. Papers are expected to employ evolutionary concepts or methods to make contributions to areas such as (but not limited to): medicine, agriculture, forestry, exploitation and management (fisheries and wildlife), aquaculture, conservation biology, environmental sciences (including climate change and invasion biology), microbiology, and toxicology. All taxonomic groups are covered from microbes, fungi, plants and animals. In order to better serve the community, we also now strongly encourage submissions of papers making use of modern molecular and genetic methods (population and functional genomics, transcriptomics, proteomics, epigenetics, quantitative genetics, association and linkage mapping) to address important questions in any of these disciplines and in an applied evolutionary framework. Theoretical, empirical, synthesis or perspective papers are welcome.
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