PDF(Pubmed)
Abstract：
Trace elements and stable isotope ratios in otoliths have been used as proxies for the migration history of teleosts; however, their application in oceanic fishes remains limited. This study reports the first use of radiocarbons in otoliths to evaluate the horizontal migration histories of an oceanic fish species, the walleye pollock Gadus chalcogrammus. We conducted radiocarbon analyses of three stocks sourced from Hokkaido, Japan. The radiocarbon concentrations from the outermost portion of the otoliths from the Japanese Pacific, Northern Japan Sea (JS), and Southern Okhotsk Sea (OS) stocks were in general agreement with the seawater radiocarbon concentration of the sampling region, suggesting that pollock of all three stocks generally inhabited the within the sea region where each pollocks were sampled throughout their life cycle. However, the radiocarbon signals also provided some indications that some JS and OS stocks may be migrating between different sea regions. The proposed novel approach of reconstructing the individual migration history of marine fish using radiocarbon in otoliths may help examine fish migration with a higher temporal and spatial resolution that could not be achieved by trace elements and stable isotope ratios.
摘要：
耳石中的微量元素和稳定同位素比率已被用作硬骨鱼迁移历史的代理；但是，它们在海洋鱼类中的应用仍然有限。这项研究报告了首次在耳石中使用放射性碳来评估海洋鱼类的水平迁移历史，角膜白斑波洛克·加杜斯的巨著。我们对来自北海道的三种库存进行了放射性碳分析，日本。日本太平洋耳石最外层的放射性碳浓度，北日本海(JS),和鄂霍次克南部海（OS）的种群与采样区的海水放射性碳浓度基本一致，这表明所有三种种群的种群通常都居住在整个生命周期中对每个种群进行采样的海域内。然而,放射性碳信号还提供了一些迹象，表明一些JS和OS库存可能在不同海域之间迁移。拟议的使用耳石中的放射性碳重建海鱼个体迁移历史的新方法可能有助于以较高的时间和空间分辨率检查鱼类迁移，而微量元素和稳定的同位素比率无法实现。
