13C and 18O isotopic disequilibria in fish otoliths: metabolic and kinetic effects
13C and 18O isotopic disequilibria in fish otoliths: metabolic and kinetic effects
复制标题
鱼类耳石中的 13C 和 18O 同位素不平衡：代谢和动力学效应
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
J. Kalish
中科院分区：
文献类型：
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作者：
J. Kalish
本文研究了多种鱼类耳石中氧、碳稳定同位素的分布，以确定这些同位素是否与环境海水处于平衡状态，以及同位素数据在鱼类生物学研究中的潜在用途。在平衡点附近没有I3 C的沉积，这证实了耳石氧同位素作为环境温度指示剂的用途。根据目前关于13 C同位素不平衡的几种理论，认为613 C偏离平衡。同时，6180和613 C证据之间存在强相关性，以支持代谢效应在培养基613 C紊乱中的重要性，以及代谢率（VO？）假设6 I3 c为F~+，低代谢率的鱼类或生活在低温下的鱼类的~（13）C沉积接近平衡，而生活在较高温度下的鱼类的耳石中的~（13）C显示出极端的消耗趋势，在一个物种的luveniles和成体中的~（13）C值也很明显，可能具有较高代谢率的幼鱼的~（13）C比成体消耗得更多。研究表明，氧和碳稳定同位素在鱼类生物学研究中具有很大的潜力，值得进一步研究
Distnbution of oxygen and carbon stable isotopes in fish otoliths from a wide range of species was invesugated to determine if the isotopes were deposited in equilibnum with ambient seawater and the potential utihty of isotope data to studies of fish biology Companson of 6180 and 6 I3c data from otoliths w t h estimates of equilibnurn aragonite indicate that ''0, but not I3C was deposited near equdibnum and this confirms the utllity of otolith oxygen isotopes as an indicator of ambient temperature The departure of 613C from equilibrium was considered In light of several current theones on 13c isotope disequilibrium There was a strong correlalon between bI3C and temperature and, concomitantly a strong relationship between 6180 and 6I3C Evldence is presented to support the Importance of metabolic effects in media lng I3C disequdibna and a strong relationship between metabohc rate (VO?) and 6I3c is hypothesized F~shes with low metabolic rates or those living at low temperatures had 13C deposited near to equilibnum whereas fishes living at higher temperatures showed extreme depletion in otolith I3C Trends were also evident in 613C values in luveniles and adults of a species with the juveniles presumably with a higher metabolic rate being more depleted in I3C than the adults The study shows that both oxygen and carbon stable isotopes have great potential in studies of fish biology and are worthy of further investigation