基于几何形态测量的西北太平洋日本鲭的个体生长规律

Growth regularity of Scomber japonicus based on geometric morphometrics in Northwest Pacific Ocean

摘要:

为探究西北太平洋海域日本鲭的个体生长规律,利用基于地标点的几何形态测量方法对2021—2022年“淞航”号调查船在西北太平洋海域采集的210尾日本鲭样本进行形态学分析。与其他方法相比,利用地标点方法能够有效揭示鱼体表型多样性,反映不同阶段鱼体的变化情况,揭示其个体生长规律。结果发现不同叉长组的日本鲭的外部形态存在显著差异。主成分分析和多元回归分析均显示,叉长组越小的个体,其分区越明显,3个叉长组间的分区位置存在重叠,不同叉长组具有相同的生长模式,日本鲭形态生长速率随叉长的增加而逐渐减小。薄板样条变形网格结果表明,叉长越小的日本鲭个体,其腹部,尾部越小,日本鲭的外部形态随着叉长的改变而发生变化。结论认为,西北太平洋日本鲭生长形态随着叉长的增加而逐渐发生改变。

Abstract:

In order to explore the growth regularity of Scomber japonicus in Northwest Pacific Ocean, 210 samples collected by the "Songhang" from 2021 to 2022 used landmarks based on geometric morphometrics.Compared with other methods, the use of landmark methods can effectively reveal the phenotypic diversity of fish, reflect the changes in fish at different stages, and explore their individual growth regularity.The results showed that there were significant differences in the external morphology of S.japonicus across different fork length groups. Both principal component analysis and multivariate analysis of covariance showed that S. japonicus with smaller fork length had more distinct zones, with overlapping zones among the three different fork length groups. Different fork length groups had the same growth regularities.The growth rate of S.japonicus gradually decreased with increasing fork length. The thin-plate spline indicates that the smaller the fork length of S.japonicus, the smaller their abdomen and tail. The morphology of S.japonicus changes with the change of fork length. The conclusion is that the morphology of S.japonicus gradually changes with increasing fork length in Northwest Pacific Ocean.