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首页> 外文期刊>Marine biology >Embryogenesis of decapod crustaceans with different life history traits, feeding ecologies and habitats: a fatty acid approach
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Embryogenesis of decapod crustaceans with different life history traits, feeding ecologies and habitats: a fatty acid approach

机译：具有不同生活史特征，觅食生态和栖息地的十足甲壳动物的胚胎发生：一种脂肪酸方法

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Variations in embryo size and fatty acid (FA) dynamics during embryogenesis were evaluated in deep-sea pandalids and portunid swimming crabs from the Portuguese continental margin and Madeira Island slope and compared with previous data on neri-tic and deep-sea lobsters and shrimps (collected between February 2001 and March 2004). Inter-specific variations in embryo size seem to be dictated primarily by phylogeny rather than by differences in reproductive or early life history traits. FA reserves were significantly correlated with embryo size (P < 0.001). Principal component analysis revealed differences among three groups (1—neritic caridean shrimps, 2— deep-sea pandalids of the genus Plesionika, and lobsters, 3—portunid crabs and the deep-sea pandalid Chlorotocus crassicornis, Costa 1871). Group 1 was clearly separated by PC1 mainly due to the higher percentage of essential C_(18) (linoleic and linolenic acids) and C_(20) (namely eicosapentaenoic) polyunsaturated FA (specific markers of primary producers). PC2 separated Group 2 from Group 3 due to differences in the percentage of several saturated FA (including odd-numbered FA—bacterial markers) and C_(18) monounsaturated FA (namely 18:1n — 9, a general marker of carnivory). Therefore, these differences among groups seem to result from distinctions in diet and ecological niche. Intra-specific differences in FA composition between western and southern Plesionika mania martia (A. Milne-Edwards, 1883) populations may reflect higher water temperatures on the south sub-tropical coast. Lobster embryonic development was more demanding of lipid energy than that of the other decapod species, which may reflect an evolutionary trend in decapod taxa related to an increasing degree of lecithotrophy. However, a lower FA catabolism can be interpreted as an enhanced independence of the newly hatched larvae from external energy sources. Higher FA content at hatching and, as a consequence, a greater independence from the external environment should increase the chances of larval survival.
机译：在葡萄牙大陆边缘和马德拉岛斜坡的深海sea和Portunid游泳蟹中评估了胚胎发生过程中胚胎大小和脂肪酸（FA）动力学的变化，并与以前的有神经性和深海龙虾和虾的数据进行了比较（ （2001年2月至2004年3月之间收集）。胚胎大小的种间差异似乎主要由系统发育决定，而不是由生殖或早期生活史特征决定。 FA储备与胚胎大小显着相关（P <0.001）。主成分分析揭示了三组之间的差异（1-甲螨，2-Plesionika属的深海pan，龙虾，3-矮脚蟹和深海的Chlorotocus crassicornis，哥斯达黎加1871）。第一组明显地被PC1分开，主要是由于必需的C_（18）（亚油酸和亚麻酸）和C_（20）（即二十碳五烯酸）多不饱和FA（主要生产者的特定标记）的百分比较高。由于一些饱和FA（包括奇数FA-细菌标记）和C_（18）单不饱和FA（即食肉动物的通用标记18：1n-9）的百分比差异，PC2将组2与组3分开。因此，这些群体之间的差异似乎是由于饮食和生态环境的差异造成的。西部和南部狂热疟原虫种群之间的种内差异（A. Milne-Edwards，1883）可能反映了南亚热带海岸的水温升高。与其他十足动物种类相比，龙虾胚胎发育对脂质能量的需求更高，这可能反映了与二十足类动物营养水平增加有关的十足动物分类群的进化趋势。但是，较低的脂肪酸分解代谢可以解释为新孵化的幼虫与外部能源的独立性增强。孵化中较高的FA含量，因此与外界环境的独立性更高，应增加幼虫存活的机会。

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