Cave colonization without fasting capacities: An example with the fish Astyanax fasciatus mexicanus
Cave colonization without fasting capacities: An example with the fish Astyanax fasciatus mexicanus
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DOI：
10.1016/j.cbpa.2010.03.030
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发表时间：
2010-08-01
影响因子：
2.3
通讯作者：
Hervant, F.
中科院分区：
文献类型：
--
作者：
Salin, K.;Voituron, Y.;Hervant, F.
地下动物通常进化出活动减退、代谢减退和/或连续使用能量储备来忍受地下环境中低食物水平所施加的长时间禁食。然而，一些热带洞穴的特点是潜在的高水平的营养。通过使用热带鱼，提出了两个人口地下（Astyanax fasciatus墨西哥）和epigean（Astyanax fasciatus fasciatus）人口，我们描述了行为，代谢和生化反应在长期禁食期间，然后再喂养期。结果表明，投饵后的鱼表现出不同的能量储存和代谢低下。但是，尽管运动活动和耗氧量急剧下降，在禁食期间，hypogean鱼消耗更多的糖原，甘油三酯和蛋白质在饥饿期间比epigean鱼。这种较低的禁食能力表现出的hypogean鱼证实了较高的激活的补偿代谢途径（生酮和异生）。再投饵期后，洞穴鱼类没有恢复从“食物剥夺”的压力，并恢复进食水平的糖原，甘油三酯储备和蛋白质，在epigean的。因此，这项研究表明，饥饿的适应是不必要的洞穴生活，而是相关的“充满活力的状态”的每个生态系统，并troglomorphism是没有联系到饥饿的能力，因此不是贫困的食物供应。(C)2010年爱思唯尔公司All rights reserved.
Subterranean animals have commonly evolved hypoactivity, hypometabolism and/or the sequential use of energetic reserves to tolerate long fasting periods imposed by the low food levels found in subterranean environments. However, some tropical caves are characterized by a potential high level of nutriments. By using the tropical fish Astyanax fasciatus that presents both populations subterranean (Astyanax fasciatus mexicanus) and epigean (Astyanax fasciatus fasciatus) populations, we described behavioral, metabolic and biochemical responses during a long-term fasting period followed by a refeeding period. The results demonstrated that fed hypogean fishes exhibited different energy stores together with a hypometabolism. But, despite drastic decreases in locomotory activity and oxygen consumption during fasting, hypogean fishes consumed significantly more glycogen, triglycerides and proteins during the starvation period than epigean fishes. This lower fasting capacity showed by hypogean fishes is confirmed by the higher activation of the compensatory metabolic pathways (ketogenesis and gluconeogenesis). After the refeeding period, cave fishes did not recover from the "food deprivation" stress, and resume fed levels in glycogen, triglyceride reserves and proteins, in contrast to epigean ones. This study thus demonstrates that starvation adaptations are not necessary for cave life, but are rather correlated to the "energetic state" of each ecosystem, and that troglomorphism is not linked to starvation capacities and thus not to the impoverished food availability. (C) 2010 Elsevier Inc. All rights reserved.