High Temperature Slows Down Growth in Tobacco Hornworms (Manduca Sexta Larvae) under Food Restriction

Abstract

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(s)

Biological Sciences

Keywords and Phrases

Energy Budget; Food Restriction; Growth; Hornworm; Metabolism; Tradeoff

International Standard Serial Number (ISSN)

1672-9609;1744-7917

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2015 Institute of Zoology, Chinese Academy of Sciences, All rights reserved.

Publication Date

01 Jun 2015

PubMed ID

24459098

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