Aerobic scope protection reduces ectotherm growth under warming

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1111/1365-2435.13811. This is version 2 of this Preprint.

Add a Comment

You must log in to post a comment.


Comments

There are no comments or no comments have been made public for this article.

Downloads

Download Preprint

Authors

Fredrik Jutfelt , Tommy Norin, Eirik Ryvoll Åsheim, Lauren E Rowsey, Anna H. Andreassen, Rachael Morgan, Timothy D Clark, Ben Speers-Roesch

Abstract

Temperature has a dramatic effect on the physiology of ectothermic animals, impacting most of their biology. When temperatures increase above optimal for an animal, their growth gradually decreases. The main mechanism behind this growth rate reduction is unknown. Here, we suggest the ‘aerobic scope protection’ hypothesis as a mechanistic explanation for the reduction in growth. After a meal, metabolic rate, and hence oxygen consumption rate, transiently increases in a process called specific dynamic action (SDA). At warmer temperatures, the SDA response usually becomes temporally compressed, leading to a higher peak oxygen consumption rate. This peak in oxygen consumption rate takes up much of the animal’s aerobic scope (the difference between resting and maximum rates of oxygen consumption), leaving little residual aerobic scope for other functions (e.g. foraging, predator avoidance, immune function). We propose that water-breathing ectothermic animals will protect their postprandial residual aerobic scope by reducing meal sizes in order to regulate the peak SDA response during times of warming, leading to reductions in growth. This hypothesis is consistent with the published literature on fishes, and we suggest predictions to test it.

DOI

https://doi.org/10.32942/osf.io/zc3bm

Subjects

Animal Sciences, Comparative and Evolutionary Physiology, Life Sciences, Physiology, Zoology

Keywords

climate change, ecophysiology, ectotherm, fish, physiology, teleost, temperature, Thermal biology

Dates

Published: 2020-01-23 17:48

Last Updated: 2021-03-14 10:52

Older Versions
License

CC-By Attribution-ShareAlike 4.0 International