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首页> 外文期刊>ICES Journal of Marine Science >Morphometric variation among sardine (Sardina pilchardus) populations from the northeastern Atlantic and the western Mediterranean
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Morphometric variation among sardine (Sardina pilchardus) populations from the northeastern Atlantic and the western Mediterranean

机译：东北大西洋和地中海西部沙丁鱼（Sardina pilchardus）种群之间的形态计量学差异

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摘要

During the past decade, regional changes in the dynamics of the Atlanto-Iberian stock of sardine, and its exploitation by Portuguese and Spanish purse-seine fisheries, have increased the uncertainties in estimated trends of spawning biomass, stock abundance, and fishing mortality. Together with recent evidence for lack of discontinuities in the distribution of sardine eggs at the edges of the stock area, this casts doubts on the hypothesis that the stock is a panmictic, closed population. Sardine morphometic data (truss variables and landmark data) from 14 samples spanning the northeastern Atlantic and the western Mediterranean were analysed by multivariate and geometric methods. The analyses explored the homogeneity of sardine shape within the area studied, as well as its relation to that of adjacent and distant populations (Azores and northwestern Mediterranean). Principal components analysis on size-corrected truss variables and cluster analysis of mean fish shape using landmark data indicate that the shape of sardine off southern Iberia and Morocco is distinct from the shape of sardine in the rest of the area. The two groups of sardine are significantly separated by discriminant analysis, and their validity was confirmed by large percentages of correct classifications of test fish (87 and 86% of fish from the test sample were correctly classified into each group, respectively). There was also some evidence that fish from the western Mediterranean and the Azores form a separate morphometric group These results question both the homogeneity within the Atlanto-Iberian sardine stock and the validity of its current boundaries.
机译：在过去的十年中，亚特兰大-伊比利亚沙丁鱼种群动态的区域变化，以及葡萄牙和西班牙的围网围网渔场对沙丁鱼的开采，增加了产卵量，种群数量和捕捞死亡率估计趋势的不确定性。再加上最近的证据表明，在种群区域边缘沙丁鱼卵的分布缺乏不连续性，这使人们对该种群是一个拥挤的封闭种群这一假设提出了怀疑。用多元和几何方法分析了横跨东北大西洋和地中海西部的14个样品的沙丁鱼形态学数据（桁架变量和界标数据）。分析探索了沙丁鱼形状在研究区域内的同质性，以及与邻近和远处种群（亚速尔群岛和地中海西北部）之间的关系。使用地标数据对尺寸校正的桁架变量进行主成分分析和平均鱼类形状的聚类分析表明，伊比利亚南部和摩洛哥南部的沙丁鱼形状与该地区其他地区的沙丁鱼形状不同。通过判别分析将两组沙丁鱼进行了显着分离，其有效性通过大量正确分类的测试鱼得到了证实（来自测试样品的鱼中有87％和86％分别正确地分为了两组）。也有证据表明，来自地中海西部和亚速尔群岛的鱼形成了一个单独的形态学组。这些结果既质疑亚特兰大-伊比利亚沙丁鱼种群内的同质性，又质疑其当前边界的有效性。

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