Individual variations in fatty acid composition and concentration as indicators of the nutritional condition of wild pointhead flounder larvae
Individual variations in fatty acid composition and concentration as indicators of the nutritional condition of wild pointhead flounder larvae
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脂肪酸组成和浓度的个体差异作为野生尖头鲽幼虫营养状况的指标
DOI：
10.1007/s00227-014-2445-3
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Y. Ando
中科院分区：
文献类型：
--
作者：
Y. Hiraoka;T. Takatsu;Y. Ando
由于我们对野生海水鱼仔稚鱼的了解相对于人工养殖的海水鱼仔稚鱼来说非常有限，因此我们采用高精度的方法对野生海水鱼仔稚鱼的脂肪酸组成和含量进行了研究。这项研究提出了估计的脂肪酸为基础的营养状况的个别幼虫在外地。由于pointhead flounderCleisthenes pinetorum显示相对较高的股票规模波动，我们调查了身体躯干，头部和眼睛的脂肪酸组成的发展变化和躯干中的脂肪酸浓度的年度波动。我们发现，脂肪酸积累的过程是不均匀的身体各部位和躯干是一个更好的指标幼虫的营养状况比其他部分，因为有较少的时间滞后。在实验室实验中观察到的同时具有高二十二碳六烯烯酸比率和低总脂肪酸浓度的饥饿幼虫在野外是罕见的。因此，饥饿的幼虫必须迅速被捕食者带走，然后才能在野外经历相对较长的饥饿期。根据广义线性模型推导的最优模型，2005年级幼虫在第一次摄食阶段的脂肪酸积累量大于2006年级幼虫。以前的一项研究表明，2005年的班级比2006年的班级表现出更强的招聘。我们的结论是，野生幼虫的脂肪酸分析是一个有用的指标，其营养状况和死亡率，特别是在第一个喂养阶段。
We investigated the fatty acid compositions and concentrations of wild marine fish larvae with a highly accurate method because our knowledge of them has been seriously limited compared with cultured larvae. This study presents estimates of the fatty-acid-based nutritional condition of individual larvae in the field. Because the pointhead flounderCleisthenes pinetorumdisplays relatively high stock size fluctuations, we investigated the developmental change in the fatty acid compositions of the body trunk, head, and eye and the annual fluctuations in the fatty acid concentrations in the trunk. We show that the process of fatty acid accumulation is not uniform across body parts and that the trunk is a better indicator of larval nutritional status than other parts because there is less time lag. Starved larvae with simultaneously high docosahexaenomic acid ratios and low total fatty acid concentrations, as observed in laboratory experiments, are rare in the wild. Thus, starved larvae must be removed rapidly by predators before they can experience a relatively long period of starvation in the wild. Fatty acid accumulation was greater in the larvae of the 2005 year class than in those of the 2006 year class in their first feeding stage, according to the optimal model derived with generalized linear model. A previous study indicated that the 2005 year class showed stronger recruitment than the 2006 year class. We conclude that the fatty acid analysis of wild larvae is a useful index of their nutritional status and mortality, especially in the first feeding stage.