As fatty acids are one of the most crucial biomolecules transferred across the aquatic food webs, they are claimed to be bioindicators of stressors. Among the various environmental stressors, food shortage is of prime importance. Lower food availability can affect fatty acid metabolism of organisms. We investigated the effects of short-term starvation on fatty acid metabolism of Daphnia magna neonates and juveniles. The results revealed that the total fatty acid content in neonates and juveniles of daphnids both rapidly declined within 24 h of starvation, and it remained constant after the following 24 h of starvation. In addition, the fatty acid profiles in neonates or juveniles fed for 24 h were not significantly different from that in the fasting individuals, while the feeding daphnids presented notably higher fatty acid saturation and lower unsaturation in relative to the fasting daphnids within the next 24 h. D . magna neonate increased its special need for C16:1n7 over food transformation, and its C16:1n7 content was elevated the most when fed for 48 h, much higher than the other fatty acids. Time-course changes in fatty acid content in starved D . magna showed that the dietary polyunsaturated α-linolenic acid, i.e. C18:3n3, could be considered as the potential biomarker in either neonates or juveniles to respond to the abiotic food shortage. This study could offer insights into the assessment of food-deprived stress in terms of fatty acid metabolism for distinct ages of cladocerans.

中文翻译：

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短期饥饿影响大水蚤新生儿和幼鱼的脂肪酸代谢

由于脂肪酸是通过水生食物网转移的最重要的生物分子之一，因此据称它们是压力源的生物指标。在各种环境压力因素中，食物短缺是最重要的。较低的食物供应会影响生物体的脂肪酸代谢。我们研究了短期饥饿对大溞新生儿和幼鱼脂肪酸代谢的影响。结果表明，水蚤新生和幼鱼的总脂肪酸含量在饥饿后24 h内均迅速下降，并在随后的24 h内保持不变。此外，喂食 24 小时的新生儿或幼鱼的脂肪酸谱与禁食个体的脂肪酸谱无显着差异，而在接下来的 24 小时内，进食的水蚤相对于禁食的水蚤表现出明显更高的脂肪酸饱和度和更低的不饱和度。D. magna 新生儿对 C16:1n7 的特殊需要超过食物转化，其 C16:1n7 含量在喂食 48 h 时升高最多，远高于其他脂肪酸。饥饿 D 中脂肪酸含量的时程变化。magna 表明，膳食多不饱和α-亚麻酸，即 C18:3n3，可被视为新生儿或青少年应对非生物食物短缺的潜在生物标志物。这项研究可以为评估不同年龄枝角类动物的脂肪酸代谢方面的食物剥夺压力提供见解。magna 新生儿对 C16:1n7 的特殊需要超过食物转化，其 C16:1n7 含量在喂食 48 h 时升高最多，远高于其他脂肪酸。饥饿 D 中脂肪酸含量的时程变化。magna 表明，膳食多不饱和α-亚麻酸，即 C18:3n3，可被视为新生儿或青少年应对非生物食物短缺的潜在生物标志物。这项研究可以为评估不同年龄枝角类动物的脂肪酸代谢方面的食物剥夺压力提供见解。magna 新生儿对 C16:1n7 的特殊需要超过食物转化，其 C16:1n7 含量在喂食 48 h 时升高最多，远高于其他脂肪酸。饥饿 D 中脂肪酸含量的时程变化。magna 表明，膳食多不饱和α-亚麻酸，即 C18:3n3，可被视为新生儿或青少年应对非生物食物短缺的潜在生物标志物。这项研究可以为评估不同年龄枝角类动物的脂肪酸代谢方面的食物剥夺压力提供见解。可以被认为是新生儿或青少年应对非生物食物短缺的潜在生物标志物。这项研究可以为评估不同年龄枝角类动物的脂肪酸代谢方面的食物剥夺压力提供见解。可以被认为是新生儿或青少年应对非生物食物短缺的潜在生物标志物。这项研究可以为评估不同年龄枝角类动物的脂肪酸代谢方面的食物剥夺压力提供见解。