【摘要】 2016年5月用刺网和拖网等在山东省境内东平湖水域采集5尾刀鲚Coilia nasus,利用电子探针微区分析技术(EPMA)研究刀鲚的矢耳石微化学特征。定量线分析结果显示,东平湖刀鲚分为两个群体:洄游群体和淡水群体。洄游群体以DP2、DP5为代表,具有反映其淡水生活履历的低锶钙值区域(0～1 250μm,0～1 310μm)和对应河口生活的高值区域(1 260～1 690μm,1 320～1 790μm)。淡水群体以DP1、DP4、DP6为代表,只有淡水生活的低值区域。本文重建了东平湖刀鲚的生境履历:洄游群体在东平湖内孵化和完成早期生活后进入盐度较高的河口区索饵育肥,生殖期不在黄河河道中滞留而直接洄游进入东平湖产卵;淡水群体则常年生活在东平湖,无洄游特征。更多还原

【Abstract】 An electron probe microanalyzer(EPMA)was applied to analyze the element Sr and Ca microchemistry patterns in otoliths of five samples of tapertail anchovy Coilia nasus collected by gill nets and trawls from Dongping Lake in Shandong province, China, in May 2016. The line transect analysis showed that the tapertail anchovy in Dongping Lake was categorized into two stocks: the anadromous stock represented by DP2 and DP5 and the freshwater stock represented by DP1, DP4 and DP6. The anadromous stock had a complex Sr/Ca ratio stages, with a lower Sr/Ca ratio area(0～1 250 μm,and 0～1 310 μm)in one stage and a higher Sr/Ca ratio(1 260～1 690 μm and 1 320～1 790 μm)in the other stage, indicating that they experienced not only in the fresh water, but also migrated into the brackish water in their life. The freshwater stock showed a single Sr and Ca microchemistry pattern which just inhabited in the fresh water. The otolith of DP1, DP4 and DP6 presented a uniform bluish pattern from the core to the outermost regions. In contrast,DP2 and DP5 showed a multi-color pattern, as they grew up, yellowish in outer regions adjacent to the bluish central regions. The element Sr and Ca microchemistry patterns revealed that tapertail anchovy in Dongping Lake spawned incubated and developed and grew in post-hatching at low salinity and, as growing up, preferred the high salinity habitats for feeding, migration, and reproduction back to Dongping Lake. The freshwater stock just inhabited in Dongping Lake all their life cycle without migration characteristics. The findings will provide the basic information and important data to direct the future ecological economic development and to protect the resources of tapertail anchovy more effectively in Dongping Lake.更多还原