Social dynamics obscure the effect of temperature on air breathing in Corydoras catfish

Killen, S. (2020) Social dynamics obscure the effect of temperature on air breathing in Corydoras catfish. Journal of Experimental Biology, 233(21), (doi: 10.1242/jeb.222133) (PMID:33097572) (PMCID:PMC7673363)

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In some fishes, the ability to breathe air has evolved to overcome constraints in hypoxic environments but comes at a cost of increased predation. To reduce this risk, some species perform group air breathing. Temperature may also affect the frequency of air breathing in fishes, but this topic has received relatively little research attention. This study examined how acclimation temperature and acute exposure to hypoxia affected the air-breathing behaviour of a social catfish, the bronze corydoras Corydoras aeneus, to determine whether individual oxygen demand influenced the behaviour of entire groups. Groups of seven fish were observed in an arena to measure air-breathing frequency of individuals and consequent group air-breathing behaviour, under three oxygen concentrations (100%, 60%, 20% air saturation) and two acclimation temperatures (25°C & 30°C). Intermittent flow respirometry was used to estimate oxygen demand of individuals. Increasingly severe hypoxia increased air-breathing at the individual and group levels. While there were minimal differences in air-breathing frequency among individuals in response to an increase in temperature, the effect of temperature that did exist manifested as an increase in group air-breathing frequency at 30°C. Groups that were more socially cohesive during routine activity took more breaths but, in most cases, air-breathing among individuals this was not temporally clustered. There was no association between an individual's oxygen demand and its air-breathing frequency in a group. For Corydoras aeneus, while air-breathing frequency is influenced by hypoxia, behavioural variation among groups could explain the small overall effect of temperature on group air-breathing frequency.

Item Type:Articles
Additional Information:This work was supported by NERC Advanced Fellowship (NE/J019100/1) and a European Research Council Starting Grant 640004 awarded to SSK.
Glasgow Author(s) Enlighten ID:Killen, Professor Shaun
Authors: Killen, S.
College/School:College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine
Journal Name:Journal of Experimental Biology
Publisher:Company of Biologists
ISSN (Online):1477-9145
Published Online:23 October 2020
Copyright Holders:Copyright © 2020 Company of Biologists. Ltd.
First Published:First published in Journal of Experimental Biology 233 (pt. 21)
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
167015The Influence of Individual Physiology on Group Behaviour in Fish SchoolsShaun KillenNatural Environment Research Council (NERC)NE/J019100/1Institute of Biodiversity, Animal Health and Comparative Medicine