High temperature slows down growth in tobacco hornworms (Manduca sexta larvae) under food restriction.
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.
Department of Biological Science, Missouri University of Science and Technology, Rolla, MO, 65409, USA.
Matthew B
MB
Hayes
Department of Biological Science, Missouri University of Science and Technology, Rolla, MO, 65409, USA.
Lihong
L
Jiao
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.
Tsu-hsuan
TH
Tsao
Department of Biological Science, Missouri University of Science and Technology, Rolla, MO, 65409, USA.
Ian
I
King
Department of Biological Science, Missouri University of Science and Technology, Rolla, MO, 65409, USA.
Michael
M
Jennings
Department of Biological Science, Missouri University of Science and Technology, Rolla, MO, 65409, USA.
Chen
C
Hou
D000818:Animals; D004734:Energy Metabolism; D005508:Food Deprivation; D006358:Hot Temperature; D007814:Larva / Q000254:growth & development / Q000378:metabolism; D018402:Manduca / Q000254:growth & development* / Q000378:metabolism
energy budget; food restriction; growth; hornworm; metabolism; tradeoff