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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Fuel use and corticosterone dynamics in hatchling green sea turtles (Chelonia mydas) during natal dispersal
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Fuel use and corticosterone dynamics in hatchling green sea turtles (Chelonia mydas) during natal dispersal

机译：幼体传播过程中孵化的绿海龟（Chelonia mydas）的燃料使用和皮质酮动态

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摘要

During their natal dispersal hatchling sea turtles depart their nest, beach and inshore areas quickly to move into offshore developmental habitat using their finite energy stores. Patterns of fuel use and endocrine responses that could facilitate hatchling sea turtle dispersal activity are poorly understood. This study, examined aspects of intermediary metabolism by measuring plasma fuel use and an endocrine response of hatchling green turtles (Chelonia mydas) during terrestrial and aquatic activity coinciding with natal dispersal. Specifically, we measured plasma concentrations of glucose, non-esterised free fatty acids and protein to gauge the contributions of carbohydrate, lipid and protein metabolism for fuelling natal dispersal. In addition, we measured plasma levels of the steroid hormone corticosterone (CORT) a hormone implicated in regulating a number of metabolic events associated with migration and energy use in vertebrates. During terrestrial activity, hatchlings ascended through the sand from their nests and exhibited significant increases in plasma CORT and lactate indicating intense periods of anaerobic activity. During swimming, all plasma metabolites, with the exception of plasma protein, peaked between 1 and 4 h post-beginning swimming activity. Plasma CORT peaked at between 3 and 5 h of swimming activity. These plasma concentrations are consistent with intensive activity inducing catabolism of carbohydrate, lipid and protein stores to support prolonged activity. These results are similar to other vertebrates and suggest a relatively uniform cascade of physiological processes during such arduous migratory events.
机译：在它们的幼体扩散孵化期间，海龟通过其有限的能量储存迅速离开其巢，海滩和近海区域，迁移到近海发展栖息地。人们对燃料的使用和内分泌反应的模式可能会促进孵化海龟的扩散活动了解甚少。这项研究通过测量血浆燃料的使用以及孵化的绿海龟（Chelonia mydas）在陆地和水生活动与出生时的传播相吻合的过程中，检查了中间代谢的各个方面。具体而言，我们测量了血浆葡萄糖，非酯化游离脂肪酸和蛋白质的浓度，以评估碳水化合物，脂质和蛋白质代谢对促进出生时的扩散的贡献。此外，我们测量了类固醇激素皮质酮（CORT）的血浆水平，该激素与调节脊椎动物中与迁移和能源使用相关的许多代谢事件有关。在陆地活动期间，孵化场的幼鱼从其巢穴中穿过沙上升，并显示血浆CORT和乳酸盐的显着增加，表明强烈的厌氧活动期。游泳过程中，除血浆蛋白外，所有血浆代谢产物均在开始游泳活动后1至4小时达到峰值。血浆CORT在游泳活动的3至5小时达到峰值。这些血浆浓度与诱导碳水化合物，脂质和蛋白质贮存的分解代谢以支持延长的活性的强烈活性一致。这些结果与其他脊椎动物相似，表明在这种艰苦的迁徙事件中，生理过程的步调相对均匀。

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