Temperature and nutrition do not interact to shape the evolution of metabolic rate

Author:

Alton Lesley A.12ORCID,Kutz Teresa2,Bywater Candice L.2,Lombardi Emily2,Cockerell Fiona E.2,Layh Sean2,Winwood-Smith Hugh2ORCID,Arnold Pieter A.2ORCID,Beaman Julian E.2ORCID,Walter Greg M.2,Monro Keyne12,Mirth Christen K.2ORCID,Sgrò Carla M.2,White Craig R.12

Affiliation:

1. Centre for Geometric Biology, Monash University, Melbourne, Victoria 3800, Australia

2. School of Biological Sciences, Monash University, Melbourne, Victoria 3800, Australia

Abstract

Metabolic cold adaptation, or Krogh's rule, is the controversial hypothesis that predicts a monotonically negative relationship between metabolic rate and environmental temperature for ectotherms living along thermal clines measured at a common temperature. Macrophysiological patterns consistent with Krogh's rule are not always evident in nature, and experimentally evolved responses to temperature have failed to replicate such patterns. Hence, temperature may not be the sole driver of observed variation in metabolic rate. We tested the hypothesis that temperature, as a driver of energy demand, interacts with nutrition, a driver of energy supply, to shape the evolution of metabolic rate to produce a pattern resembling Krogh's rule. To do this, we evolved replicate lines of Drosophila melanogaster at 18, 25 or 28°C on control, low-calorie or low-protein diets. Contrary to our prediction, we observed no effect of nutrition, alone or interacting with temperature, on adult female and male metabolic rates. Moreover, support for Krogh's rule was only in females at lower temperatures. We, therefore, hypothesize that observed variation in metabolic rate along environmental clines arises from the metabolic consequences of environment-specific life-history optimization, rather than because of the direct effect of temperature on metabolic rate. This article is part of the theme issue ‘The evolutionary significance of variation in metabolic rates’.

Funder

Australian Research Council

Publisher

The Royal Society

Subject

General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Consequences of the cost of living: is variation in metabolic rate evolutionarily significant?;Philosophical Transactions of the Royal Society B: Biological Sciences;2024-01-08

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