Delineating population structure of resilient sea/river‐type sockeye salmon

IF 5.1 2区 地球科学 Q1 LIMNOLOGY
Kyle G. Brennan, Sean R. Brennan, Timothy Cline, Gabriel J. Bowen
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引用次数: 0

Abstract

Conserving wild fisheries requires identifying and monitoring distinct populations, yet prevalent genetic approaches often do not integrate habitat data and may not fully delineate these structures. This issue is critical in sea/river‐type sockeye salmon (Oncorhynchus nerka), an ecotype whose specific spawning habitats better define distinct breeding populations. Despite possessing traits that confer greater resilience to climate change and significant contributions to wild fisheries, gene flow among groups dilutes genetic structure, making it difficult to track populations. We focus on sea/river sockeye from one of the Pacific Rim's largest Sockeye fisheries, combining river strontium (Sr) isotope predictions, otolith Sr isotope measurements, and a Bayesian assignment model with a 4‐yr radiotelemetry and genetic dataset (n = 1994) to delineate the geographic structure of spawning habitats. Our results identify four distinct subpopulations with unique natal habitat Sr isotope ratios previously undifferentiated by genetic methods, providing a novel approach to monitor critical groups over multiple years.
划定具有恢复力的海洋/河流型红鲑的种群结构
保护野生渔业需要识别和监测不同的种群,但目前流行的遗传方法往往没有整合栖息地数据,可能无法完全划分这些结构。这个问题对海洋/河流型红鲑鱼(Oncorhynchus nerka)至关重要,这种生态型的特定产卵栖息地能更好地界定不同的繁殖种群。尽管红鲑具有更强的抵御气候变化的能力,并对野生渔业做出了重大贡献,但群体间的基因流动稀释了遗传结构,使得追踪种群变得困难。我们重点研究了环太平洋地区最大的红衫鱼渔业之一的海/河红衫鱼,将河流锶(Sr)同位素预测、耳石 Sr 同位素测量和贝叶斯分配模型与 4 年的放射性遥测和遗传数据集(n = 1994)相结合,划分产卵栖息地的地理结构。我们的研究结果确定了四个不同的亚群,它们具有独特的产卵栖息地钍同位素比率,而以前的遗传方法无法区分它们,这为多年监测关键群体提供了一种新方法。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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