Temperature and salinity effects on magnesium, manganese, and barium incorporation in otoliths of larval and early juvenile spot Leiostomus xanthurus
Temperature and salinity effects on magnesium, manganese, and barium incorporation in otoliths of larval and early juvenile spot Leiostomus xanthurus
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温度和盐度对 Leiostomus xanthurus 幼虫和早期幼斑斑鱼耳石中镁、锰和钡掺入的影响
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
S. Thorrold
中科院分区：
文献类型：
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作者：
G. B. Martin;S. Thorrold
利用耳石化学来描绘鱼类种群和追踪洄游途径，是基于耳石的元素组成与周围环境的物理化学性质之间的显著相关性。然而，很少有实验已经严格设计，以解决温度和盐度对耳石的元素组成的影响。在实验室条件下，研究了温度和盐度对黄尾滑口鱼（Leiostomus xanthurus）幼鱼和早期幼鱼耳石中镁（Mg）、锰（Mn）和钡（Ba）结合的影响。L.黄尾鱼是一种依赖于雌鱼的物种，在它们的整个生活史中经历不同的温度和盐度状态。因此，在试图根据耳石化学的瓦里重建重要的生命史转变之前，了解不同水团的物理化学性质的影响是很重要的。（Mg/Ca）耳石和Mg分配系数DMg均不受温度和盐度的影响，但与耳石沉积量和体细胞生长速率相关。温度和盐度对DMn有显著的交互作用，但对（Mn/Ca）耳石无交互作用。最后，DBa受盐度而不是温度的影响。这些结果突出了元素沉积在耳石中的复杂性质，并表明环境和生理效应可能影响鱼类耳石中的元素比例。
The use of otolith chemistry to delineate fish populations and trace migration pathways is premised on a significant correlation between the elemental composition of otoliths and physico- chemical properties of the ambient environment. However, few experiments have been rigorously designed to address the effects of temperature and salinity on the elemental composition of otoliths. We examined the effects of temperature and salinity on the incorporation of magnesium (Mg), man- ganese (Mn), and barium (Ba) in the otoliths of larval and early juvenile spot Leiostomus xanthurus by rearing fish in the laboratory under controlled environmental conditions. L. xanthurus are an estu- arine dependent species that traverse varying temperature and salinity regimes throughout their life histories. It is important, therefore, to understand the influence of physicochemical properties of dif- ferent water masses before attempting to reconstruct important life history transitions based on vari- ations in otolith chemistry. Both (Mg/Ca)otolith and the Mg partition coefficient, DMg, were not signifi- cantly affected by either temperature or salinity, but were correlated with otolith precipitation and somatic growth rates. Temperature and salinity had significant interaction effects on DMn, but not on (Mn/Ca)otolith. Finally, DBa was influenced by salinity but not temperature. These results highlight the complex nature of elemental deposition in otoliths, and suggest that both environmental and physio- logical effects likely influence elemental ratios in fish otoliths.