Data for: Stable isotopes in eye lenses reveal migration and mixing patterns of diamond squid in the western North Pacific and its marginal seas

Knowledge of the movements of marine organisms is essential for effective conservation schemes. Here, we investigated the lifetime habitat use of diamond squid, Thysanoteuthis rhombus, collected in the western North Pacific and its marginal seas (the Sea of Japan and the East China sea) during 2021–2022, whose migratory ecology is poorly known, using bulk stable nitrogen and carbon isotope ratios in eye lenses. From the eye lens isotope profiles, the chronology of the isotopic baseline of squid habitat was estimated by removing the effect of size-dependent changes of trophic position. Then, the baseline estimates were compared to the isoscapes of particulate organic matter. The baseline chronologies showed fluctuations during the paralarval and juvenile stages, becoming stable during the adult stage, suggesting that significant movements mainly occur during the early life stages due to current transport, with adults potentially not undertaking long-distance migrations. The squids in the...

了解海洋生物的活动规律，是制定高效海洋保护方案的必要前提。本研究针对迁徙生态学尚不明晰的菱鳍乌贼（*Thysanoteuthis rhombus*），以2021-2022年采自西北太平洋及其边缘海（日本海与东海）的样本为研究对象，通过分析其眼晶状体中的批量稳定氮、碳同位素比值，探究其终生栖息地利用模式。基于眼晶状体的同位素图谱，研究人员通过剔除营养级随体型变化带来的影响，估算出乌贼栖息地同位素基线的时间序列。随后将估算得到的基线序列与颗粒有机质的同位素空间分布图（isoscapes）进行对比。结果显示，该同位素基线时间序列在仔稚期存在波动，至成体阶段趋于稳定，这表明菱鳍乌贼的显著移动主要发生在早期生活史阶段，由海流输送驱动，而成体可能并不会进行长距离迁徙。本次研究中的乌贼在...