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Quantifying the energetic cost of food quality constraints on resting metabolism to integrate nutritional and metabolic ecology
Ecology Letters ( IF 8.8 ) Pub Date : 2021-08-01 , DOI: 10.1111/ele.13855
Thomas Ruiz 1 , Apostolos-Manuel Koussoroplis 1 , Michael Danger 2 , Jean-Pierre Aguer 1 , Nicole Morel-Desrosiers 1 , Alexandre Bec 1
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Consumer metabolism controls the energy uptake from the environment and its allocation to biomass production. In natural ecosystems, available energy in food often fails to predict biomass production which is also (co)limited by the relative availability of various dietary compounds. To date, the link between energy metabolism and the effects of food chemical composition on biomass production remains elusive. Here, we measured the resting metabolic rate (RMR) of Daphnia magna along ontogeny when undergoing various (non-energetic) nutritional constraints. All types of dietary (co)limitations (Fatty acids, Sterols, Phosphorus) induced an increase in mass-specific RMR up to 128% between highest and lowest quality diets. We highlight a strong negative correlation between RMR and growth rate indicating RMR as a promising predictor of consumer growth rate. We argue that quantifying the energetic cost imposed by food quality on individual RMR may constitute a common currency enabling the integration of nutritional and metabolic ecology.

中文翻译:

量化食物质量限制静息代谢的能量成本,以整合营养和代谢生态

消费者新陈代谢控制着从环境中吸收的能量及其在生物质生产中的分配。在自然生态系统中,食物中的可用能量通常无法预测生物质产量,这也受到各种膳食化合物的相对可用性的(共同)限制。迄今为止,能量代谢与食品化学成分对生物质生产的影响之间的联系仍然难以捉摸。在这里,我们测量了大溞的静息代谢率 (RMR)当经历各种(非能量)营养限制时,沿着个体发育。所有类型的饮食(共)限制(脂肪酸、甾醇、磷)都导致质量特定 RMR 在最高质量和最低质量饮食之间增加了 128%。我们强调 RMR 和增长率之间存在很强的负相关性,表明 RMR 是消费者增长率的有希望的预测指标。我们认为,量化食品质量对个体 RMR 施加的能量成本可能构成一种共同的货币,能够实现营养和代谢生态的整合。
更新日期:2021-10-08
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