大西洋蓝金枪鱼 (Thunnus thynnus) 大规模迁移的潜在指标是奥托利特氧同位素配置文件
Deirdre Brophy1, Elizabeth Tray2, Louise Vaughan1
1Marine and Freshwater Research Centre, Atlantic Technological University, ATU Galway City, Dublin Road, Galway, Ireland.
Marine environmental research
|September 13, 2025
概括
对大西洋蓝金枪鱼耳石中稳定的氧气同位素的二次离子质谱 (SIMS) 分析显示,对跟踪迁移有希望. 内热能影响同位素分离,但SIMS仍然可以揭示不同水体之间的运动.
科学领域:
- 海洋生物学 海洋生物学
- 同位素地球化学 同位素地球化学
- 渔业 科学 渔业 科学
背景情况:
- 大西洋蓝金枪鱼 (Thunnus thynnus) 进行广泛的迁徙.
- 了解这些运动对于渔业管理和保护至关重要.
- 奥托利特稳定的同位素是重建迁徙历史的潜在标记物.
研究的目的:
- 评估二次离子质谱法 (SIMS) 在大西洋蓝鱼耳石中分析稳定的氧同位素 (δ18O) 的实用性.
- 为了将SIMS测量与传统的同位素比质谱法 (IRMS) 进行比较.
- 调查内热对奥托利特 δ18O 分割的影响及其对迁移研究的影响.
主要方法:
- 对相同的耳石样本进行SIMS和IRMS分析的比较.
- 来自养殖成年金枪鱼和野生年幼鱼的耳石SIMS分析.
- 应用温度依赖分成模型,包括海水和头骨温度.
- 模拟以评估使用奥托利特 δ18O.O. 的迁徙运动的可检测性.
主要成果:
- 虽然SIMS和IRMS的测量结果是相关的,但有系统的差异.
- 奥托利特 δ18O 的波动与养殖鱼的季节性变化保持一致,但绝对值低于预期.
- 在使用头骨温度时,预测和观察到的δ18O值之间的差异得到解决,这表明内热的影响.
- 模拟证实SIMS δ18O分析可以检测不同盐度区域之间的移动.
结论:
- 石 δ18O 的 SIMS 分析是了解大西洋蓝鱼迁徙模式的一个有前途的工具.
- 内热显著影响着石 δ18O 分割,需要在模型中使用头骨温度.
- 这种技术有可能提高对金枪鱼迁徙行为和库存结构的了解.
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