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Migration history of fishes inferred from otolith microchemistry including oxygen isotopic composition and Sr : Ca ratio

根据耳石微化学（包括氧同位素组成和 Sr：Ca 比率）推断鱼类的迁徙历史

基本信息

批准号：
09660194
负责人：
OTAKE Tsuguo
金额：
$ 2.18万
依托单位：
Mie University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09660194/
关键词：
Fish Otolith Oxygen isotopic ratio Sr : Ca ratio Migration history Sr:Ca比

项目摘要

Objectives of this study were to examine fish migratory history from otolith microstructure and microchemistry including oxygen isotopic composition and Sr : Ca ratios. We confirmed that secondary ion mass spectrometry (SIMS) was useful methodology to analyze oxygen isotopes of fish otolith. The changes in water temperature that fish individual experienced is reconstructed by examine oxygen isotopic composition accompanied with otolith daily rings. [Oxygen isotopic composition] Glass eel(Japanese eel)otoliths were used for this oxygen isotopic examination. Each otolith was grounded to expose the otolith core. The smoothing of grounded otolith surface was very critical for the accuracy of SIMS analysis. The oxygen isotopic composition was examined on the otolith including otolith core and surrounding regions. The ratio (^<18>O/^<16>O) was revealed to be higher in ototith core than the other surrounding region, suggesting that spawning temperature of eels was lower than that the larvae exposed. Eels may spawn in deeper waters in their spawning area. [Otolith Sr : Ca ratios] Otolith Sr : Caratios were examined on otoliths of Japanese sardine and ayu (amphidromous fish). Changes in otolithSr : Ca ratios were not accompanied with changes in water temperature and salinity in Japanese sardine, suggesting that otolith Sr : Ca ratio was not useful for investigating the migration history of Japanese sardine. In contrast, the ratio well reconstructed the changes in distribution environment (i.e. sea, brakish, freshwater) in amphidromous ayu individuals. And it was revealed to be useful to distinguishing between amphidromous and non-amphidromous stocked fish.

本研究的目的是从耳石的微观结构和微观化学（包括氧同位素组成和Sr: Ca比）来研究鱼类的洄游历史。我们证实了二次离子质谱法（SIMS）是分析鱼耳石氧同位素的有效方法。通过考察氧同位素组成和耳石日环，重建了鱼个体所经历的水温变化。[氧同位素组成]采用玻璃鳗鱼（日本鳗鱼）耳石进行氧同位素测定。每个耳石都接地以暴露耳石核心。耳石接地表面的平滑对SIMS分析的准确性至关重要。测定了耳石的氧同位素组成，包括耳石芯和周围区域。该比值（^<18>O/^<16>O）在中耳区高于周围其他区域，表明鳗鱼的产卵温度低于所暴露的幼虫。鳗鱼可能在产卵区较深的水域产卵。[耳石Sr: Ca比值]测定了日本沙丁鱼和雌雄鱼的耳石Sr: Ca比值。日本沙丁鱼耳石Sr: Ca比值的变化不随水温和盐度的变化而变化，表明耳石Sr: Ca比值对研究日本沙丁鱼的洄游史没有帮助。该比值较好地再现了双栖阿玉个体分布环境（海、咸水、淡水）的变化。结果表明，该方法可用于区分双性和非双性放养鱼类。