Hayes Matthew B, Jiao Lihong, Tsao Tsu-hsuan, King Ian, Jennings Michael, Hou Chen
Department of Biological Science, Missouri University of Science and Technology, Rolla, MO, 65409, USA.
Department of Biological Science, National Taiwan Normal University, Taipei, Taiwan, 11677, China.
Insect Sci. 2015 Mar;22(3):424-30. doi: 10.1111/1744-7917.12109. Epub 2014 May 20.
When fed ad libitum (AL), ectothermic animals usually grow faster and have higher metabolic rate at higher ambient temperature. However, if food supply is limited, there is an energy tradeoff between growth and metabolism. Here we hypothesize that for ectothermic animals under food restriction (FR), high temperature will lead to a high metabolic rate, but growth will slow down to compensate for the high metabolism. We measure the rates of growth and metabolism of 4 cohorts of 5th instar hornworms (Manduca sexta larvae) reared at 2 levels of food supply (AL and FR) and 2 temperatures (20 and 30 °C). Our results show that, compared to the cohorts reared at 20 °C, the ones reared at 30 °C have high metabolic rates under both AL and FR conditions, but a high growth rate under AL and a low growth rate under FR, supporting this hypothesis.
在自由采食（AL）的情况下，变温动物通常在较高的环境温度下生长更快且代谢率更高。然而，如果食物供应有限，生长和代谢之间就会存在能量权衡。在这里，我们假设对于处于食物限制（FR）状态下的变温动物，高温会导致高代谢率，但生长会减缓以补偿高代谢。我们测量了在2种食物供应水平（AL和FR）以及2种温度（20和30°C）下饲养的4组5龄烟草天蛾（烟草天蛾幼虫）的生长和代谢速率。我们的结果表明，与在20°C下饲养的组相比，在30°C下饲养的组在AL和FR条件下均具有高代谢率，但在AL条件下生长速率高，在FR条件下生长速率低，这支持了这一假设。
