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2 results for “compound-specific stable isotope analysis”
Tracking long-distance migration of marine fishes using compound-specific stable isotope analysis of amino acids
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 (<i>δ</i><sup>15</sup>N<sub>Base</sub>), which allows for direct comparison of isotope ratios between proxy organisms of the isoscape and the target migratory animal. We initially constructed a <i>δ</i><sup>15</sup>N<sub>Base</sub> isoscape in the North Pacific by bulk and compound-specific isotope analyses of copepods (<i>n</i> = 360 and 24, respectively). We then determined retrospective <i>δ</i><sup>15</sup>N<sub>Base</sub> values of spawning chum salmon (<i>Oncorhynchus keta</i>) from their vertebral centra (10 sections from each of two salmon), and estimated their migration routes 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 migration route to the Bering Sea Shelf during a later growth stage.
Tracking long-distance migration of marine fishes using compound-specific stable isotope analysis of amino acids
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