Population structure and habitat connectivity of Pogonias courbina (Perciformes, Sciaenidae) in two Brazilian lagoon systems on south-east coast of Rio de Janeiro, Brazil, inferred from otolith shape and elemental signatures

IF 2.1 4区 地球科学 Q2 MARINE & FRESHWATER BIOLOGY
Paulo Roberto Camponez de Almeida , Marcus Rodrigues da Costa , Ana Tereza Rodrigues Ribeiro , Agostinho Almeida , Rui Azevedo , Cassiano Monteiro-Neto , Alberto Teodorico Correia
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引用次数: 0

Abstract

The delimitation of fish stocks and how species use habitats are essential keys to develop and to implement fishery resources management and rational sustainable programs. Otolith shape and microchemistry analyses can provide helpful information for defining population units and solving ecological connectivity issues. The black drum, Pogonias courbina, is an important fishery resource in the southeastern Brazil lagoon systems, and is considered a vulnerable fish according to the IUCN Red List of Threatened Species. Thus, the present study aimed to understand the population structure and habitat connectivity of P. courbina in two lagoon systems in the south-east coast of Rio de Janeiro, Brazil. A total of 60 individuals were collected from the lagoons of Saquarema (SQ) and Araruama (AR), between November 2019 and April 2020. Thirty individuals from each location, all estimated to be two years old based on the counting of the annual growth increments, were used. The composition (multi-elemental signatures – MES) and shape (elliptic Fourier descriptors – EFD) of the sagittal otoliths were integrated to evaluate the population structure and the habitat connectivity of the fish inside these lagoon systems. EFD showed differences between lagoon systems, with an overall reclassification rate of 97%. The MES exhibited distinct patterns between lagoon systems, mainly driven by differences in Ba/Ca, Co/Ca, Li/Ca, Mg/Ca, Ni/Ca, Sr/Ca, and Zn/Ca ratios. The overall reclassification rate for MES was also 97% (93% and 100% for SQ and ARA, respectively). The overall reclassification rate obtained using both EFD and MES was 98%. The results suggest a clear spatial discrimination and low connectivity between these groups of two years old P. coubina individuals living in the studied lagoon systems. These findings imply that small-scale artisanal fisheries in the lagoon systems require more attention, aiming to maximize local management strategies for commercially exploited species.

根据耳石形状和元素特征推断巴西里约热内卢东南海岸两个巴西泻湖系统中 Pogonias courbina(鲈形目,鲷科)的种群结构和栖息地连通性
鱼类种群的划分以及物种如何利用栖息地是制定和实施渔业资源管理和合理可持续计划的关键。耳石形状和微化学分析可为界定种群单位和解决生态连接问题提供有用信息。黑鼓(Pogonias courbina)是巴西东南部泻湖系统的重要渔业资源,被世界自然保护联盟(IUCN)列入濒危物种红色名录,属于易危鱼类。因此,本研究旨在了解巴西里约热内卢东南海岸两个泻湖系统中 P. courbina 的种群结构和栖息地连通性。在2019年11月至2020年4月期间,研究人员从Saquarema泻湖(SQ)和Alaruama泻湖(AR)共采集了60个个体。每个地点各采集 30 只,根据年生长增量的计算,估计年龄均为两年。综合矢状耳石的成分(多元素特征--MES)和形状(椭圆傅立叶描述符--EFD)来评估这些泻湖系统内鱼类的种群结构和栖息地的连通性。EFD 显示了不同泻湖系统之间的差异,总体重新分类率为 97%。MES 在不同泻湖系统之间表现出不同的模式,主要由 Ba/Ca、Co/Ca、Li/Ca、Mg/Ca、Ni/Ca、Sr/Ca 和 Zn/Ca 比率的差异所驱动。MES 的总体重新分类率也达到了 97%(SQ 和 ARA 分别为 93% 和 100%)。使用 EFD 和 MES 的总体重新分类率为 98%。这些结果表明,生活在所研究泻湖系统中的两岁库比纳鱼个体群体之间存在明显的空间差异和较低的连通性。这些研究结果表明,需要对泻湖系统中的小型个体渔业给予更多关注,以便最大限度地利用当地的商业开发物种管理策略。
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来源期刊
Journal of Sea Research
Journal of Sea Research 地学-海洋学
CiteScore
3.20
自引率
5.00%
发文量
86
审稿时长
6-12 weeks
期刊介绍: The Journal of Sea Research is an international and multidisciplinary periodical on marine research, with an emphasis on the functioning of marine ecosystems in coastal and shelf seas, including intertidal, estuarine and brackish environments. As several subdisciplines add to this aim, manuscripts are welcome from the fields of marine biology, marine chemistry, marine sedimentology and physical oceanography, provided they add to the understanding of ecosystem processes.
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