Auer Sonya K, Salin Karine, Anderson Graeme J, Metcalfe Neil B
Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Graham Kerr Building, Glasgow G12 8QQ, UK
Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Graham Kerr Building, Glasgow G12 8QQ, UK.
Biol Lett. 2015 Nov;11(11). doi: 10.1098/rsbl.2015.0793.
Links between metabolism and components of fitness such as growth, reproduction and survival can depend on food availability. A high standard metabolic rate (SMR; baseline energy expenditure) or aerobic scope (AS; the difference between an individual's maximum and SMR) is often beneficial when food is abundant or easily accessible but can be less important or even disadvantageous when food levels decline. While the mechanisms underlying these context-dependent associations are not well understood, they suggest that individuals with a higher SMR or AS are better able to take advantage of high food abundance. Here we show that juvenile brown trout (Salmo trutta) with a higher AS were able to consume more food per day relative to individuals with a lower AS. These results help explain why a high aerobic capacity can improve performance measures such as growth rate at high but not low levels of food availability.
新陈代谢与生长、繁殖和生存等健康要素之间的联系可能取决于食物的可获得性。当食物丰富或易于获取时，高标准代谢率（SMR；基础能量消耗）或有氧代谢范围（AS；个体最大代谢率与SMR之间的差值）通常是有益的，但当食物水平下降时，其重要性可能降低甚至变得不利。虽然这些依赖于环境的关联背后的机制尚未完全了解，但它们表明具有较高SMR或AS的个体能够更好地利用丰富的食物资源。我们在此表明，相对于AS较低的个体，AS较高的幼年褐鳟（Salmo trutta）每天能够消耗更多食物。这些结果有助于解释为什么高有氧能力在食物可获得性高而非低的情况下能够提高生长速率等性能指标。
