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Otolith phenotypic variation as an indicator of stock structure of Scomberomorus brasiliensis from the southwestern Atlantic Ocean
Fisheries Research ( IF 2.4 ) Pub Date : 2022-05-05 , DOI: 10.1016/j.fishres.2022.106357
Marcelo Soeth , Felippe Alexandre Daros , Alberto Teodorico Correia , Nidia Noemi Fabré , Reginaldo Medeiros , Caroline Vieira Feitosa , Oscar de Sousa Duarte , Tiago Moraes Lenz , Henry Louis Spach

Phenotypic variation of Scomberomorus brasiliensis otoliths was evaluated by testing the null hypothesis of a single stock across the southwestern Atlantic Ocean. Otolith sampling of S. brasiliensis (n = 396) took place between July and October 2019 at nine locations along the Brazilian coast. The shape of each otolith contour was assessed with elliptic Fourier descriptors (EFDs) and their variation evaluated through multivariate analyses. Fish size-otolith size relationships were used to explore interregional differences in S. brasiliensis growth. Cluster analysis based on EFDs separated the sampling locations into tropical (2°S to 20°S) and subtropical (23°S to 27°S) Atlantic regions. The variation of EFDs between these regions was over twice as large as the within region variation. Linear discriminant analysis (LDA) discriminated between regions with 72.85% overall accuracy. Subtropical fish were characterized by the lowest otolith mass at fish size, suggesting great conditions for the growth of S. brasiliensis in subtropical waters. Local phenotypic structuring among S. brasiliensis population units was less evident (LDA, 29.6% overall accuracy), most likely due to high demographic connectivity on short spatial scales, or even, small environmental heterogeneity to promote discrete phenotypic in S. brasiliensis otoliths. Yet, EFDs from distant population units (2°S and 23–27°S) were statistically similar and a likelihood of extensive longshore migration could not be excluded with the herein used approach. These results suggest, however, regional population units appear not regularly mix and fishery managers need to consider such Atlantic regions as functionally distinct management units in a metapopulation perspective.



中文翻译:

耳石表型变异作为西南大西洋 Scomberomorus brasiliensis 种群结构的指标

通过测试横跨西南大西洋的单一种群的零假设来评估Scomberomorus brasiliensis耳石的表型变异。2019 年 7 月至 2019 年 10 月期间,在巴西海岸的九个地点对S. brasiliensis (n = 396) 进行了耳石采样。使用椭圆傅里叶描述符 (EFD) 评估每个耳石轮廓的形状,并通过多变量分析评估它们的变化。鱼大小-耳石大小关系用于探索S. brasiliensis的区域间差异生长。基于 EFD 的聚类分析将采样位置分为热带(2°S 至 20°S)和亚热带(23°S 至 27°S)大西洋区域。这些区域之间 EFD 的变化是区域内变化的两倍多。线性判别分析 (LDA) 以 72.85% 的总体准确率区分区域。亚热带鱼类的特点是在鱼体大小时耳石质量最低,这表明S. brasiliensis在亚热带水域生长的良好条件。S. brasiliensis种群单位之间的局部表型结构不太明显(LDA,总体准确度为 29.6%),这很可能是由于短空间尺度上的高人口连通性,或者甚至是小的环境异质性促进了离散表型S. brasiliensis耳石。然而,来自遥远人口单位(2°S 和 23-27°S)的 EFD 在统计学上相似,并且不能用本文使用的方法排除广泛的沿岸迁移的可能性。然而,这些结果表明,区域人口单位似乎并不经常混合,渔业管理者需要从综合种群的角度将这些大西洋地区视为功能上不同的管理单位。

更新日期:2022-05-06
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