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Identification of western South Atlantic stocks of the Lane snapper (Lutjanus synagris) from an otolith based multi-proxy approach
Fisheries Research ( IF 2.4 ) Pub Date : 2022-05-13 , DOI: 10.1016/j.fishres.2022.106356
Jessica Borba Quintela Dos Santos, Cristiano Mazur Chiessi, Stefano Crivellari, Jonas Eloi de Vasconcelos Filho, Natan Silva Pereira, Matheus Oliveira Freitas, Beatrice Padovani Ferreira

Accurate stock assessments are the basis of adequate fisheries management. In the Southwest Atlantic, fisheries of the Lane snapper (Lutjanus synagris) have been growing in importance in the last decades, following declines in other snapper fisheries since the late 1970 s, with evidence of overexploitation accumulating since the mid-2000 s. Contrasting environmental conditions along the area are potential drivers of stock separation, yet no phenotypic approach has ever been applied to the stock identification of the species in the area. Here we employ a multi-proxy approach based on otolith shape and isotopic composition to identify Lane snapper stocks in the Southwest Atlantic, and also investigate whether geographical limits of Large Marine Ecosystems and Marine Ecoregions are suitable surrogates for estimating stock boundaries, which could be useful for application in stock assessments when stock boundaries are unknown. The spatial heterogeneity evidenced by all proxies used supported the existence of distinct Lane snapper stocks, contrasting to previous genetic-based studies. Our results reveal a strong influence of environmental and oceanographic conditions as drivers of stock separation. The Marine Ecoregions system was considered a more appropriate surrogate for delineating stock boundaries, representing a fast and feasible approach to facilitate stock assessments in other data-limited fisheries.



中文翻译:

从基于耳石的多代理方法识别南大西洋西部的 Lane snapper (Lutjanus synagris) 种群

准确的种群评估是充分渔业管理的基础。在西南大西洋,巷鲷鱼(Lutjanus synagris) 在过去的几十年里,随着其他鲷鱼渔业自 1970 年代后期以来的下降,其重要性日益增加,有证据表明自 2000 年代中期以来过度捕捞的积累。该地区对比鲜明的环境条件是种群分离的潜在驱动因素,但尚未将表型方法应用于该地区物种的种群鉴定。在这里,我们采用基于耳石形状和同位素组成的多代理方法来识别西南大西洋的莱恩鲷鱼群,并调查大型海洋生态系统和海洋生态区的地理范围是否适合估计种群边界,这可能是有用的用于在种群边界未知时进行种群评估。使用的所有代理证明的空间异质性支持存在不同的莱恩鲷鱼种群,这与以前的基于遗传的研究形成鲜明对比。我们的结果揭示了环境和海洋条件作为种群分离驱动因素的强烈影响。海洋生态区系统被认为是划定种群边界的更合适的替代方法,代表了一种快速可行的方法,以促进其他数据有限的渔业中的种群评估。

更新日期:2022-05-13
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