Instituto de Investigaciones en Producción Animal (INPA-CONICET-UBA), Facultad de Ciencias Veterinarias, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina.
Departamento de Hidrobiología, Universidad Autónoma Metropolitana, Mexico City, Mexico.
J Fish Biol. 2020 Oct;97(4):1187-1200. doi: 10.1111/jfb.14500. Epub 2020 Sep 15.
The white mullet Mugil curema supports several fisheries in the neotropical region; nevertheless, the population structure is still elusive. The aim of this study was to assess the presence of adult management units and nursery areas from five sampling sites throughout the Gulf of Mexico and northern Brazil using otolith microchemistry. The Li/Ca, Na/Ca, Mn/Ca, Sr/Ca, Ba/Ca and Pb/Ca ratios were measured in otolith core (juvenile stage) and edge (adult stage) (N = 131) using laser ablation-inductively coupled plasma-mass spectrometry. Several ratios were significantly different between sampling sites for core and edge (P < 0.05). For otolith edge, permutational multivariate analysis of variance showed significant differences (P < 0.05) between all sampling sites from Mexico (except between Mecoacán and Tamiahua, P > 0.05) and between Mexico (pooled samples) and Brazil. Quadratic discriminant analyses showed jackknifed classification higher in the edge (66.6% and 99.5% for Mexico and Brazil plus Mexico, respectively) than in the core (46.3% and 76.5% Mexico and Brazil plus Mexico, respectively). The two cluster analyses based on the core microchemistry (Mexico and Brazil plus Mexico) produced three main clusters, which did not coincide with catchment areas. These results support the segregation of the M. curema adult life stages among several sampling sites from Mexico and Brazil; moreover, core analysis suggested that the nursery areas did not correspond to the capture sites or adults stocks.
白姑鱼 Mugil curema 支持新热带地区的几种渔业；然而，其种群结构仍然难以捉摸。本研究旨在使用耳石微化学评估来自墨西哥湾和巴西北部五个采样点的成年管理单位和育苗区的存在。使用激光烧蚀 - 电感耦合等离子体质谱法测量了耳石核心（幼鱼期）和边缘（成鱼期）（N = 131）中的 Li/Ca、Na/Ca、Mn/Ca、Sr/Ca、Ba/Ca 和 Pb/Ca 比值。对于耳石边缘，多变量方差分析的置换检验显示了所有采样点之间的显著差异（P < 0.05）（墨西哥除外，梅科阿坎和塔米亚瓦之间无显著差异，P > 0.05）以及墨西哥（汇集样本）和巴西之间的显著差异。二次判别分析显示，边缘的 jackknifed 分类更高（墨西哥分别为 66.6%和 99.5%，墨西哥和巴西分别为 76.5%）比核心（墨西哥和巴西分别为 46.3%和 76.5%）。基于核心微化学的两个聚类分析（墨西哥和巴西加上墨西哥）产生了三个主要聚类，这些聚类与集水区不一致。这些结果支持了墨西哥和巴西的几个采样点的 M. curema 成鱼阶段的隔离；此外，核心分析表明育苗区与捕捞点或成鱼群不一致。
