Franco Taynara Pontes, Vilasboa Anderson, Araújo Francisco Gerson, de Moura Gama Joana, Correia Alberto Teodorico
Laboratório de Ecologia de Peixes, Departamento de Biologia Animal, Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropédica, Rio de Janeiro 23897-030, Brazil.
Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR/CIMAR), Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos S/N, 4450-208 Matosinhos, Portugal.
Biology (Basel). 2023 Feb 24;12(3):360. doi: 10.3390/biology12030360.
The inshore area of the Southwestern Atlantic between 22 °S and 29 °S (South Brazilian Bight) is a transitional climatic zone, where the tropical and warm temperate provinces mix. In its northern part, i.e., in the coastal waters of Rio de Janeiro, Brazil, local oceanographic conditions, such as upwelling in the north, and great bays with different degrees of anthropogenic influences in the center and south can determine the population structure of several fish stocks. The Whitemouth croaker () is one the most heavily exploited fishing resources in this area, but there are still some doubts about its population structure. In this study, through combined analyses using nuclear genetic markers and morphological and geochemical signatures of otoliths, a divergence of individuals between two populations was identified using microsatellites, while a finer spatial structure with three populations (north, center and south, respectively) was found based on otolith shapes and elemental signatures. This regional population structure may have direct implications for rational fisheries management and conservation of the species.
西南大西洋22°S至29°S之间的近岸区域（巴西南部海湾）是一个过渡性气候带，热带和暖温带省份在此交汇。在其北部，即巴西里约热内卢的沿海水域，当地的海洋学条件，如北部的上升流，以及中部和南部受不同程度人为影响的大湾，会决定几种鱼类种群的结构。白口笛鲷（）是该地区开发程度最高的渔业资源之一，但对其种群结构仍存在一些疑问。在本研究中，通过使用核基因标记以及耳石的形态和地球化学特征进行联合分析，利用微卫星鉴定出两个种群之间的个体差异，同时基于耳石形状和元素特征发现了一个更精细的空间结构，分别为三个种群（北部、中部和南部）。这种区域种群结构可能对该物种的合理渔业管理和保护具有直接影响。
