Chrystelle Delord, Sophie Arnaud-Haond, Agostino Leone, Jonathan Rolland, Natacha Nikolic
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By focusing on <i>N</i><sub>e</sub>, it is conceivable in certain cases to approximate census size once the <i>N</i><sub>e</sub>/<i>N</i><sub>c</sub> ratio is known, although this ratio can vary and does not always increase linearly, as it is influenced by various ecological and evolutionary factors. Thus, this ratio presents challenges and complexities in the context of pelagic species conservation. To delve deeper into these challenges, firstly, we recall the diverse types of effective population sizes, including contemporary and historical sizes, and their implications in conservation biology. Secondly, we outline current knowledge about the influence of life history traits on the <i>N</i><sub>e</sub>/<i>N</i><sub>c</sub> ratio in the light of examples drawn from large and abundant pelagic fish species. 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引用次数: 0
摘要
估算和了解有效种群数量(N e)和普查种群数量(N c)之间的比率,对于保护大型海洋中上层鱼类物种(包括金枪鱼等硬骨鱼类和鲨鱼等软骨鱼类)至关重要,因为要准确估算它们的丰度是一项挑战。在广阔而多变的海洋环境中捕捉和监测这些物种本身就存在困难,因此直接估算其种群数量往往具有挑战性。通过关注 N e,可以设想在某些情况下,一旦知道 N e/N c 的比率,就能大致估算出普查规模,尽管这一比率会受到各种生态和进化因素的影响而变化,而且并不总是呈线性增长。因此,这一比率给远洋物种保护带来了挑战和复杂性。为了深入探讨这些挑战,首先,我们回顾了有效种群规模的不同类型,包括当代和历史规模,以及它们在保护生物学中的意义。其次,我们根据大型丰富中上层鱼类的实例,概述了目前有关生活史特征对 N e/N c 比率影响的知识。尽管利用最新技术和统计方法记录了越来越多的海洋物种,但建立预测 N e/N c 的一般规则仍然遥遥无期,需要进一步的研究和投资。最后,我们回顾了将 N e 和 N c 联系起来所面临的统计挑战,强调了调整时间和空间尺度的必要性。最后一部分讨论了世代和繁殖周期有效种群数量在预测遗传侵蚀和指导管理策略方面的作用。总之,这些部分强调了有效种群数量估计的多面性,这对于保护遗传多样性和确保种群的长期生存能力至关重要。通过克服统计和理论上的复杂性以及应对方法上的挑战,科学家们应该能够推进我们对 N e/N c 比率的理解。
Unraveling the Complexity of the Ne/Nc Ratio for Conservation of Large and Widespread Pelagic Fish Species: Current Status and Challenges
Estimating and understanding the ratio between effective population size (Ne) and census population size (Nc) are pivotal in the conservation of large marine pelagic fish species, including bony fish such as tunas and cartilaginous fish such as sharks, given the challenges associated with obtaining accurate estimates of their abundance. The difficulties inherent in capturing and monitoring these species in vast and dynamic marine environments often make direct estimation of their population size challenging. By focusing on Ne, it is conceivable in certain cases to approximate census size once the Ne/Nc ratio is known, although this ratio can vary and does not always increase linearly, as it is influenced by various ecological and evolutionary factors. Thus, this ratio presents challenges and complexities in the context of pelagic species conservation. To delve deeper into these challenges, firstly, we recall the diverse types of effective population sizes, including contemporary and historical sizes, and their implications in conservation biology. Secondly, we outline current knowledge about the influence of life history traits on the Ne/Nc ratio in the light of examples drawn from large and abundant pelagic fish species. Despite efforts to document an increasing number of marine species using recent technologies and statistical methods, establishing general rules to predict Ne/Nc remains elusive, necessitating further research and investment. Finally, we recall statistical challenges in relating Ne and Nc emphasizing the necessity of aligning temporal and spatial scales. This last part discusses the roles of generation and reproductive cycle effective population sizes to predict genetic erosion and guiding management strategies. Collectively, these sections underscore the multifaceted nature of effective population size estimation, crucial for preserving genetic diversity and ensuring the long-term viability of populations. By navigating statistical and theoretical complexities, and addressing methodological challenges, scientists should be able to advance our understanding of the Ne/Nc ratio.
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.