Tracking long-distance migration of marine fishes using compound-specific stable isotope analysis of amino acids
Tracking long-distance migration of marine fishes using compound-specific stable isotope analysis of amino acids
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DOI：
10.1111/ele.13496
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发表时间：
2020-05-01
期刊：
影响因子：
8.8
通讯作者：
Tayasu, Ichiro
中科院分区：
文献类型：
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作者：
Matsubayashi, Jun;Osada, Yutaka;Tayasu, Ichiro
海洋鱼类的长距离洄游很难通过实地观察来跟踪。在这里，我们提出了一种新的方法来跟踪这种迁移使用稳定的氮同位素组成的食物网的基础（三角洲N-15（基地）），这可以通过使用化合物特定的同位素分析来估计。delta N-15（Base）仅反映区域尺度海洋中硝酸盐的delta N-15，不受采样生物营养位置的影响。换句话说，δ N-15（碱基）允许直接比较等壳纲的代理生物和目标迁徙动物之间的同位素比率。我们最初构建了一个三角洲N-15（基地）isoscape在北方北太平洋的桡足类（n = 360和24，分别）的散装和化合物特定的同位素分析，然后我们确定了回顾性三角洲N-15（基地）值的产卵鲑鱼（Oncorhynchus凯塔）从他们的脊椎中心（10节，从每两个鲑鱼）。然后，我们估计的迁移路线的鲑鱼在其骨骼生长过程中，通过使用状态空间模型。我们的同位素跟踪方法成功地再现了鄂霍次克海和白令海之间的鲑鱼迁徙路线，我们的研究结果表明，存在一个新的迁徙路线，白令海大陆架在以后的生长阶段。
The long-distance migrations by marine fishes are difficult to track by field observation. Here, we propose a new method to track such migrations using stable nitrogen isotopic composition at the base of the food web (delta N-15(Base)), which can be estimated by using compound-specific isotope analysis. delta N-15(Base) exclusively reflects the delta N-15 of nitrate in the ocean at a regional scale and is not affected by the trophic position of sampled organisms. In other words, delta N-15(Base) allows for direct comparison of isotope ratios between proxy organisms of the isoscape and the target migratory animal. We initially constructed a delta N-15(Base) isoscape in the northern North Pacific by bulk and compound-specific isotope analyses of copepods (n = 360 and 24, respectively), and then we determined retrospective delta N-15(Base) values of spawning chum salmon (Oncorhynchus keta) from their vertebral centra (10 sections from each of two salmon). We then estimated the migration routes of chum salmon during their skeletal growth by using a state-space model. Our isotope tracking method successfully reproduced a known chum salmon migration route between the Okhotsk and Bering seas, and our findings suggest the presence of a new migration route to the Bering Sea Shelf during a later growth stage.