基于耳石元素微化学的江苏吕泗近岸小黄鱼生境履历重建  

Reconstructing habitat history of Larimichthys polyactis in Lüsi coastal waters of Jiangsu Province,China based on otolith microchemistry

作　　者：熊瑛[1,2] 刘洪波[3] 刘培廷[2] 汤建华[2] 杨健[1,3] 姜涛[1] 吴磊[2] 高银生[2] 施金金[2] 

机构地区：[1]南京农业大学无锡渔业学院,江苏无锡214081 [2]江苏省海洋水产研究所,江苏南通226007 [3]中国水产科学研究院淡水渔业研究中心内陆渔业生态环境与资源重点开放实验室,江苏无锡214081

出　　处：《应用生态学报》2014年第3期836-842,共7页Chinese Journal of Applied Ecology

基　　金：国家"908"专项(JS-908-01-01;JS-908-02-08);江苏省研究生培养创新工程项目(CXZZ13_0275);江苏省科技支撑计划项目(BE2012422);江苏省科技基础设施建设计划项目(BM2012059)资助

摘　　要：利用电子显微探针元素分析技术,对江苏吕泗近岸海域小黄鱼矢耳石的Sr和Ca微化学特征进行了研究.结果表明:Sr含量在小黄鱼耳石的矢状面上呈非均匀分布,总体为核心部位高,其余部分明显降低.核心高Sr区域的Sr/Ca比值为(7.10±1.00),其余部分为(4.79±1.01),两者差异极显著.后者部分个体存在Sr含量更低的区域,Sr/Ca比值为(3.51±0.76).基于这些结果重建了吕泗近岸小黄鱼的生境履历:它们在孵化及初期发育阶段生活在高盐度生境,随后的生长和发育过程则会洄游至盐度稍低的生境;部分个体的早期发育阶段还会选择利用更低盐度的生境.An electron probe microanaiyzer （EPMA） was applied to analyze the element Sr and Ca microchemistry patterns in otoliths of Larimichthys polyactis in Ltisi coastal waters of Jiangsu Province, China. The results showed that Sr was heterogeneously distributed along the sagittal plane of the otoliths. The highest Sr concentration was normally found in the otolith cores while much low- er concentrations were found in the remaining areas. The corresponding St/Ca ratios were （7.10_＋ 1.00） and （4.79＋1.01） in the former and latter, respectively, which were significantly differed （P〈0.01）, but low Sr/Ca ratios even as low as （3.51-0.76） were also observed in several fish. Based on the above results of otolith microchemistry, the habitat history of L. polyactis was reconstructed as that high salinity habitats seemed to be required at the stages of hatching and post-hatching development, while the reduced salinity habitats seemed to be preferable for the growth and development at the remaining stages of the life history. Furthermore, several fish in this study had likely even experienced much lower salinity habitats at the early stages.

关 键 词：小黄鱼 吕泗近岸 耳石 电子显微探针分析 生境履历 

分 类 号：S917.4[农业科学—水产科学]