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首页> 外文期刊>ICES Journal of Marine Science >Natural variability in δ~(18)O values of otoliths of young Pacific sardine captured in Mexican waters indicates subpopulation mixing within the first year of life
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Natural variability in δ~(18)O values of otoliths of young Pacific sardine captured in Mexican waters indicates subpopulation mixing within the first year of life

机译：在墨西哥水域捕获的年轻太平洋沙丁鱼耳石的耳石的δ〜（18）O值的自然变异性表明生命的第一年内亚群混合

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摘要

Oxygen stable isotopes were measured in whole sagittae of young Pacific sardine (δ~(18)O_(oto)) collected throughout their range in the Mexican Pacific to quantify natural variability, to reconstruct temperature histories, and to infer whether fish mix at a population or subpopulation level. Isotopic values and derived temperature estimates (T_(oto)) of sardine captured simultaneously showed high varia-bility (up to 2.0‰ and 10℃ at a given location). Given limited variations in salinity, this implies differences in thermal history and the prevalence of subpopulation-level mixing processes. We tested the null hypothesis of local residence by comparing δ~(18)O_(oto) values with predicted isotopic values on a location-specific basis, and age- and location-specific average sea surface temperatures (SSTs) with derived Toto. Some fish exhibited values outside the local range of predicted oxygen isotope values and SSTs, suggesting that they were not permanent residents. Using an otolith growth model, we show that otolith growth and age differences cannot fully account for the variability in δ~(18)O_(oto) values. The absence of significant differences in δ~(18)O_(oto) values between the Pacific and Gulf indicates that oxygen isotope ratios cannot be used to examine population structure or migration among these regions. However, they can be used to infer mixing within and among subpopulations.
机译：在墨西哥太平洋的整个沙丁鱼幼鱼的整个矢状体中测量氧稳定同位素（δ〜（18）O_（oto）），以量化自然变异性，重建温度历史并推断鱼类是否在某个种群中混合或子人口级别。同时捕获的沙丁鱼的同位素值和导出的温度估计值（T_（oto））显示出较高的变异性（在给定位置最高可达2.0‰和10℃）。在盐度变化有限的情况下，这意味着热历史和亚种群水平混合过程的普遍性存在差异。我们通过比较δ〜（18）O_（oto）值与特定位置的预测同位素值，以及年龄和特定位置的平均海表温度（SST）与派生的Toto，来测试本地居住的零假设。一些鱼显示的值超出了预测的氧同位素值和SST的局部范围，表明它们不是永久居民。使用耳石生长模型，我们表明耳石生长和年龄差异不能完全解释δ〜（18）O_（oto）值的变异性。太平洋和海湾之间的δ〜（18）O_（oto）值不存在显着差异，这表明氧同位素比不能用于检验这些地区之间的种群结构或迁移。但是，它们可用于推断亚群内部和之间的混合。

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