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首页> 美国卫生研究院文献>PLoS Clinical Trials >Otolith Trace Elemental Analyses of South American Austral Hake, Merluccius australis (Hutton, 1872) Indicates Complex Salinity Structuring on their Spawning/Larval Grounds
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Otolith Trace Elemental Analyses of South American Austral Hake, Merluccius australis (Hutton, 1872) Indicates Complex Salinity Structuring on their Spawning/Larval Grounds

机译：南美南方无须鳕耳石的痕量元素分析（赫顿，1872年）表明其产卵/幼虫地上的复杂盐分结构

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摘要

Trace element signatures of otolith edges and cores from 335 austral hake (Merluccius autralis) were analysed using LA-ICPMS from samples collected in Chilean and Falkland Islands' waters, in order to provide potential insights into stock discrimination and migrations. Fish were caught in two locations in Chile and four locations in the south-west of the Falkland Islands Shelf. Univariate and multivariate analyses of trace element signatures in the edges of otoliths, representing adult fish, were not able to distinguish between samples collected in Chile and the Falkland Islands. Cluster analyses based on Ward’s similarity/distance metric suggested that it was possible to identify two groups from core signatures. Further analyses of this perceived clustering of the core concentrations revealed that this was largely due to the wide spread of Sr/Ca ratios in the otoliths’ cores. Gaussian finite mixtures using MCMC methods confirmed that Sr/Ca ratios form two separate distributions with significantly different mean values while concentrations of other elements showed no evidence of the presence of two or more distributions. The results suggest that there is only one spawning stock of austral hake with spawning situated in and around the Chilean fjords (43°30’S– 47°S) and the variation in Sr/Ca ratios likely suggests complex salinity structuring in this area.
机译：使用LA-ICPMS分析了从智利和福克兰群岛水域采集的样本中来自335个南澳大利亚鳕鱼（耳rl）的耳石边缘和岩心的痕量元素特征，以提供潜在的种群识别和迁移信息。鱼在智利的两个地方和福克兰群岛货架西南部的四个地方被捕。代表成鱼的耳石边缘微量元素特征的单变量和多变量分析无法区分在智利和福克兰群岛采集的样品。根据Ward的相似度/距离量度进行的聚类分析表明，可以从核心特征中识别出两组。进一步对感知到的核心浓度成簇的分析表明，这主要是由于Sr / Ca比值在耳石核心中的广泛分布。使用MCMC方法的高斯有限混合物证实，Sr / Ca比值形成两个独立的分布，均值明显不同，而其他元素的浓度则没有证据表明存在两个或多个分布。结果表明，在智利峡湾及其周围（43°30′S–47°S）只有一个产卵的南方鳕鱼产卵，而锶/钙比的变化可能表明该地区盐分结构复杂。

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