基于耳石微化学Sr/Ca的浙江南部近海银姑鱼的生境履历重建

Reconstruction of habitat history of Pennahia argentata in the offshore waters of southern Zhejiang based on otolith microchemical Sr/Ca

浙江南部近海是我国重要的渔场水域,银姑鱼是该海域中常见的经济鱼类。研究针对浙江南部近海的银姑鱼栖息环境进行探究,以期揭示其个体发育过程中的环境变化史。实验基于该海域的银姑鱼耳石样品展开,并运用ICP-MS技术测定耳石微结构的Sr、Ca等元素。通过分析Sr/Ca比值,发现银姑鱼的栖息环境变动范围为3.39×10^(-3)~8.12×10^(-3),表明其存在咸淡水定居型和咸淡水-海水混合型两种生境类型,另外Sr元素也被证实能有效地示踪鱼类的生境履历。这一发现不仅丰富了我们对银姑鱼生态习性的理解,也为银姑鱼洄游路径研究提供较为可行和准确的方法和途径。

The offshore waters of southern Zhejiang serve as an important fishing ground in China,where Pennahia argentata is a common economic fish species.This study explores the habitat of P.argentata in the offshore waters of southern Zhejiang in order to reveal the environmental changes during its individual development.The experiment is based on the otolith samples of P.argentata in this area,and ICP-MS technology is used to measure the Sr and Ca elements in the otolith microstructure.By analyzing the Sr/Ca ratio,it is found that the range of environmental changes for P.argentata habitat is between 3.39×10^(-3)and 8.12×10^(-3),indicating the existence of two habitat types:freshwater and brackish water settlement,and brackish-freshwater and seawater mix.In addition,Sr element has been proven to be an effective tracer of the fish habitat history.This discovery not only enriches our understanding of the ecological habits of P.argentata,but also provides a new,feasible,and accurate method and approach for studying the migration routes of P.argentata.