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实验通过激光剥蚀电感等离子质谱法分析哥斯达黎加外海茎柔鱼耳石的微量元素,了解其微量元素组成及其与表温关系,推测其不同生活史阶段的栖息环境。结果表明,茎柔鱼耳石含有54种元素,其中Ca、Na和Sr为主要元素。总体耳石Sr/Ca大于太平洋褶柔鱼、巴塔哥尼亚枪乌贼和黵乌贼。胚胎期耳石Sr/Ca最高,随着年龄增加而下降。Sr/Ca与表温呈反比例关系。不同孵化月份的茎柔鱼在不同生长阶段的耳石Sr/Ca差异不明显。Ba/Ca可看做茎柔鱼垂直移动的指标元素,茎柔鱼仔鱼至成鱼期耳石Ba/Ca呈“U”型变化,与其幼体生活在海水表层,成体生活在较深层海水相对应。茎柔鱼耳石Mg/Ca核心高外围低,可能与耳石生长率逐渐减小有关,Mg/Ca与表温呈正相关。此外,研究认为茎柔鱼胚胎期是以自身携带的卵黄囊为营养物质,此时耳石的微量元素与亲体的遗传因素相关,与外界水环境无关。
In this study, the trace elements in the Ostracodon otoliths of Costa Rica were analyzed by laser ablation inductively-coupled plasma mass spectrometry (ICP-MS). The trace elements and their relationship with the surface temperature were estimated and the habitats of different stages of their life history were estimated. The results showed that the stem otolith contains 54 kinds of elements, of which Ca, Na and Sr as the main elements. The total otolith Sr / Ca was greater than that of Pacific tuna, Patagonian calamari and Squid. The otolith Sr / Ca is the highest in embryonic stage and declines with age. Sr / Ca is inversely proportional to the surface temperature. Solefish Sr in different hatching months had no significant difference in otolith Sr / Ca at different growth stages. Ba / Ca can be regarded as the indicator element for the vertical movement of squid, and the change of Ba / Ca is “U” from otter to adult, Corresponding. The high peripheral low Mg / Ca core of sternolith fish otolith may be related to the decreasing of otolith growth rate, while Mg / Ca is positively correlated with superficial temperature. In addition, the study suggests that Silybum marianum embryos are carried by their own yolk sac as a nutrient, then the otolith trace elements and genetic factors related to the body, with the external water environment has nothing to do.