太湖及洪泽湖太湖新银鱼耳石元素锶钙比的比较研究-上海海洋大学学报.DOC

太湖及洪泽湖太湖新银鱼耳石元素锶钙比的比较研究 周昕期1, 刘洪波姜涛杨健( ( 1. 上海海洋大学, 上海 201306; 2. 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. 南京农业大学无锡渔业学院，江苏 无锡 21408l) 利用元素电子显微探针分析技术，对南太湖（白雀乡水域）、北太湖（吴塘门至乌龟山水域）以及洪泽湖（老子山水域）的太湖新银鱼（Neosalanx taihuensis）的矢耳石进行了锶及钙元素积累特征的。元素定量线分析和面分布分析结果均直观而明显地表明北太湖太湖新银鱼的分为两种，一类锶钙比21.41±0.50，N=4)，另一类锶钙1.64±0.12，N=5)；南太湖的锶钙比3.12±0.07，N=10)；洪泽湖锶钙比5.42±0.32，N=9)。间锶钙比差异显著（P0.0）。洪泽湖耳石有高锶环的存在，而太湖锶分布均一。太湖新银鱼太湖新银鱼 研究亮点：: 太湖新银鱼；耳石；电子探针；锶钙比；耳石微化学 Comparative study on otolith Sr:Ca ratios of Neosalanx taihuensis from Taihu Lake and Hongze Lake of China Zhou Xin-qi1, Liu Hong-bo2, Jiang Tao3, Yang Jian3 (1. College of Fisheries and Life Science，Shanghai Ocean University, Shanghai 201306, China; 2. Key Lab. of Ecological Environment and Resources of Inland Fisheries, Freshwater Fisheries Research Center , Chinese Academy of Fishery Sciences , Wuxi 214081 ,Jiangsu， China; 3. Wuxi Fisheries College, Nanjing Agriculture University, Wuxi 214081, Jiangsu， China ) Abstract: An electron probe microanalyzer was used to analyze the microchemistry of Sr and Ca in sagittal otoliths of the Salangid icefish Neosalanx taihuensis from southern (area of Baiquexiang) and northern (area between Wutangmen and Wuguishan) Taihu Lake, and Hongze Lake (area of Laozishan). The results of both the life history transect analysis and X-ray intensity mapping analyses clearly showed that there were two different patterns in otolith samples of N. taihuensis from northern Taihu Lake. One was characterized by high Sr:Ca ratios (Sr:Ca×1000) with a mean value of 21.41 (SD, 0.50; N=4); whereas another showed low Sr:Ca ratios with a mean value of 1.64 (SD, 0.12; N=5). In contrast, mean otolith Sr:Ca ratios of the fish from southern Taihu Lake was 3.12 (SD, 0.07; N=10). That of N. taihuensis form Hongze Lake was 5.42 (SD, 0.32; N=9). The difference of otolith Sr:Ca ratio values was statistically significant at a 5% level among the icefish from different water areas. In addition, the X-ray intensity maps showed