Genetic Sex and Origin Identification Suggests Differential Migration of Male and Female Atlantic Bluefin Tuna (Thunnus thynnus) in the Northeast Atlantic

IF 3.5 2区 生物学 Q1 EVOLUTIONARY BIOLOGY
Einar Eg Nielsen, Kim Birnie-Gauvin, Henrik Baktoft, Haritz Arrizabalaga, Tomas Brodin, Massimiliano Cardinale, Michele Casini, Gustav Helström, Teunis Jansen, Anders Koed, Petter Lundberg, Brian R. MacKenzie, Antonio Medina, Søren Post, Naiara Rodriguez-Ezpeleta, Andreas Sundelöf, José Luis Varela, Kim Aarestrup
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Abstract

Knowledge about sex-specific difference in life-history traits—like growth, mortality, or behavior—is of key importance for management and conservation as these parameters are essential for predictive modeling of population sustainability. We applied a newly developed molecular sex identification method, in combination with a SNP (single nucleotide polymorphism) panel for inferring the population of origin, for more than 300 large Atlantic bluefin tuna (ABFT) collected over several years from newly reclaimed feeding grounds in the Northeast Atlantic. The vast majority (95%) of individuals were genetically assigned to the eastern Atlantic population, which migrates between spawning grounds in the Mediterranean and feeding grounds in the Northeast Atlantic. We found a consistent pattern of a male bias among the eastern Atlantic individuals, with a 4-year mean of 63% males (59%–65%). Males were most prominent within the smallest (< 230 cm) and largest (> 250 cm) length classes, while the sex ratio was close to 1:1 for intermediate sizes (230–250 cm). The results from this new, widely applicable, and noninvasive approach suggests differential occupancy or migration timing of ABFT males and females, which cannot be explained alone by sex-specific differences in growth. Our findings are corroborated by previous traditional studies of sex ratios in dead ABFT from the Atlantic, the Mediterranean, and the Gulf of Mexico. In concert with observed differences in growth and mortality rates between the sexes, these findings should be recognized in order to sustainably manage the resource, maintain productivity, and conserve diversity within the species.

Abstract Image

基因性别和产地鉴定表明东北大西洋雌雄大西洋蓝鳍金枪鱼(Thunnus thynnus)的迁移存在差异
了解生命史特征(如生长、死亡率或行为)的性别差异对于管理和保护至关重要,因为这些参数对于种群可持续性的预测建模至关重要。我们应用新开发的分子性别鉴定方法,结合 SNP(单核苷酸多态性)面板推断原产种群,对数年来从大西洋东北部新开垦的觅食地收集的 300 多条大型大西洋蓝鳍金枪鱼(ABFT)进行了鉴定。绝大多数个体(95%)的基因被归入东大西洋种群,该种群在地中海产卵场和东北大西洋觅食场之间洄游。我们发现,在东大西洋种群中,雄性偏多的模式是一致的,4 年平均雄性比例为 63%(59%-65%)。在体长最小(230 厘米)和最大(250 厘米)的个体中,雄性个体最为突出,而在体长中等(230-250 厘米)的个体中,性别比例接近 1:1。这种新的、广泛适用的非侵入式方法得出的结果表明,ABFT雌雄鱼的栖息地或迁移时间不同,这不能仅用生长的性别差异来解释。我们的发现与之前对大西洋、地中海和墨西哥湾死亡 ABFT 性别比例的传统研究结果相吻合。这些研究结果与观察到的雌雄鱼生长和死亡率的差异相一致,应得到认可,以便对资源进行可持续管理、保持生产力和保护物种多样性。
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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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