@article{16a67b6e21a646b59f9ec774e7469595,
title = "Tracking long-distance migration of marine fishes using compound-specific stable isotope analysis of amino acids",
abstract = "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 (δ15NBase), which can be estimated by using compound-specific isotope analysis. δ15NBase exclusively reflects the δ15N of nitrate in the ocean at a regional scale and is not affected by the trophic position of sampled organisms. In other words, δ15NBase allows for direct comparison of isotope ratios between proxy organisms of the isoscape and the target migratory animal. We initially constructed a δ15NBase 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 δ15NBase 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.",
keywords = "Bering Sea Shelf, North Pacific, copepods, isoscape, migration, salmon, δN",
author = "Jun Matsubayashi and Yutaka Osada and Kazuaki Tadokoro and Yoshiyuki Abe and Atsushi Yamaguchi and Kotaro Shirai and Kentaro Honda and Chisato Yoshikawa and Ogawa, {Nanako O.} and Naohiko Ohkouchi and Ishikawa, {Naoto F.} and Toshi Nagata and Hiroomi Miyamoto and Shigeto Nishino and Ichiro Tayasu",
note = "Funding Information: We thank I. Itoh and C. Kamata at the Tohoku National Fisheries Research Institute for the preparation of copepod samples; C. Yoshimizu at the Research Institute for Humanity and Nature for stable isotope analysis of bulk tissues; A. Matsuda and T. Kawakami at the University of Tokyo and K. Nakata and S. Yoshimasu at the Japan Fisheries Research and Education Agency for providing salmon samples for analysis; Y. Takano, T. Blattmann and anonymous reviewers for their helpful comments on the draft of this paper; the Foundation for the Japan Science and Technology Agency Core Research for Evolutional Science and Technology (JST CREST) Grant JPMJCR13A4 and JPMJCR13A3; the Japan Society for the Promotion of Science (JSPS) KAKENHI Grant 17J04991 and 19K20495 to J.M.; the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) the Arctic Challenge for Sustainability (ArCS) Project, and MEXT; Tohoku Ecosystem‐Associated Marine Sciences Project Grant JPMXD1111105259 and JPMXD1111105260. Funding Information: We thank I. Itoh and C. Kamata at the Tohoku National Fisheries Research Institute for the preparation of copepod samples; C. Yoshimizu at the Research Institute for Humanity and Nature for stable isotope analysis of bulk tissues; A. Matsuda and T. Kawakami at the University of Tokyo and K. Nakata and S. Yoshimasu at the Japan Fisheries Research and Education Agency for providing salmon samples for analysis; Y. Takano, T. Blattmann and anonymous reviewers for their helpful comments on the draft of this paper; the Foundation for the Japan Science and Technology Agency Core Research for Evolutional Science and Technology (JST CREST) Grant JPMJCR13A4 and JPMJCR13A3; the Japan Society for the Promotion of Science (JSPS) KAKENHI Grant 17J04991 and 19K20495 to J.M.; the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) the Arctic Challenge for Sustainability (ArCS) Project, and MEXT; Tohoku Ecosystem-Associated Marine Sciences Project Grant JPMXD1111105259 and JPMXD1111105260. Publisher Copyright: {\textcopyright} 2020 John Wiley & Sons Ltd/CNRS",
year = "2020",
month = may,
day = "1",
doi = "10.1111/ele.13496",
language = "English",
volume = "23",
pages = "881--890",
journal = "Ecology Letters",
issn = "1461-023X",
publisher = "Wiley-Blackwell",
number = "5",
}