Discrimination of nursery locations of juvenile Japanese flounder Paralichthys olivaceus on the Pacific coast of norther
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ORIGINAL ARTICLE Biology
Discrimination of nursery locations of juvenile Japanese flounder Paralichthys olivaceus on the Pacific coast of northern Japan based on carbon and nitrogen stable isotope ratios Yoshikazu Kato1,2 · Hiroyuki Togashi3 · Yutaka Kurita3 · Hiromitsu Kamauchi1,2 · Ichiro Tayasu1 Received: 16 December 2019 / Accepted: 1 May 2020 © Japanese Society of Fisheries Science 2020
Abstract To test whether stable isotope ratios of carbon (δ13C) and nitrogen (δ15N) can be used to understand the ecological connectivity of Japanese flounder Paralichthys olivaceus, we evaluated the isotopic signatures of juvenile P. olivaceus from the Pacific coast of northern Japan (i.e., from Aomori to Ibaraki Prefectures). We measured δ13C and δ15N in muscle and collagen extracted from vertebrae and found that isotope ratios were strongly correlated in both. The discrimination models we developed for muscle and collagen proved useful in distinguishing among juvenile P. olivaceus collected from the five prefectures (Aomori, Iwate, Miyagi, Fukushima, and Ibaraki). Juveniles collected in Aomori in particular showed significantly lower values of δ13C and δ15N than those from the other prefectures, which likely reflects the greater influence of the Tsugaru Warm Current in that region. Because collagen in the vertebral centrum can be used to reconstruct annual isotopic records, our results may also assist in developing migration tracking procedures for adult P. olivaceus along the Pacific coast of northern Japan. Keywords Teleost fish · Collagen · Carbon stable isotope ratio · Nitrogen stable isotope ratio · Vertebral centrum · Chronological record · Tohoku region Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12562-020-01436-y) contains supplementary material, which is available to authorized users. * Yoshikazu Kato [email protected] Hiroyuki Togashi [email protected] Yutaka Kurita [email protected] Hiromitsu Kamauchi [email protected]‑u.ac.jp Ichiro Tayasu [email protected] 1
Research Institute for Humanity and Nature, 457‑4 Motoyama, Kamigamo, Kita‑ku, Kyoto 603‑8047, Japan
2
Graduate School of Environmental Studies, Nagoya University, Furo‑cho, Chikusa‑ku, Nagoya, Aichi 464‑8601, Japan
3
Tohoku National Fisheries Research Institute, Japan Fisheries Research and Education Agency, 3‑27‑5, Shinhama‑cho, Shiogama, Miyagi 985‑0001, Japan
Introduction Quantifying the scale and magnitude of dispersal among populations and life stages is a major challenge in marine ecology (Cowen et al. 2006). Generally, broadcast spawners and fishes with a planktonic larval stage experience two major dispersal phases. In the initial, largely passive, phase larvae and eggs roughly follow the movement of water masses. In the second, active, phase juveniles migrate from nurseries to recruit into adult populations (Secor 1999). Tracking the location of individual juveniles is a necessary first step in understanding this second phase, which in turn is c
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