Temperature-dependent fractionation of stable oxygen isotopes in otoliths of juvenile cod (Gadus morhua L.)
Temperature-dependent fractionation of stable oxygen isotopes in otoliths of juvenile cod (Gadus morhua L.)
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DOI：
10.1016/j.icesjms.2003.11.006
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发表时间：
2004-04-01
影响因子：
3.3
通讯作者：
Folkvord, A
中科院分区：
文献类型：
--
作者：
Hoie, H;Otterlei, E;Folkvord, A
分析耳石中的稳定氧同位素是一种很有前途的技术，估计环境温度所经历的鱼类，但一致的方程之间的温度和分馏的稳定氧同位素在不同的鱼类物种耳石缺乏。幼鳕鱼饲养在恒温从6至20 degreesC和矢状耳石的氧同位素值进行了分析。我们确定，温度依赖性分馏的耳石中的氧同位素接近无机文石在低温下的报告，但有偏离氧同位素分馏方程的其他物种的耳石。鳕鱼耳石氧同位素值与温度的线性关系为：1000 Ln α = 16.75（10（3）TK-1）- 27.09。在95%的概率水平下，温度估计精度为1 ℃，需要样本量大于或等于5个耳石。只有一个微不足道的量的差异，在数据是由于左右耳石之间的差异，并由于重复测量耳石子样本。这项研究证实，鳕鱼耳石的稳定同位素值可以精确和准确地估计鱼类所经历的环境温度。(C)2004年国际海洋考察理事会。由爱思唯尔有限公司出版。保留所有权利。
Analysis of stable oxygen isotopes in otoliths is a promising technique for estimating the ambient temperature experienced by fish, but consistent equations relating temperature and fractionation of stable oxygen isotopes in otoliths among different fish species are lacking. Juvenile cod were reared at constant temperatures from 6 to 20degreesC and the sagittal otoliths were analysed for oxygen isotope values. We determined that temperature-dependent fractionation of oxygen isotopes in the otoliths was close to that reported for inorganic aragonite at low temperatures, but there were deviations from oxygen isotope fractionation equations for otoliths of other species. The linear relationship between oxygen isotope value in the cod otoliths and temperature was determined to be: 1000 Ln alpha = 16.75 (10(3) TK-1) - 27.09. Temperature estimates with 1 degreesC precision at the 95% probability level require a sample size of greater than or equal to5 otoliths. Only an insignificant amount of the variance in the data was due to variance between left and right otolith, and due to repeated measurements of otolith subsamples. This study confirms that stable isotope values of cod otoliths can give precise and accurate estimates of the ambient temperature experienced by fish. (C) 2004 International Council for the Exploration of the Sea. Published by Elsevier Ltd. All rights reserved.