Reversible brain inactivation induces discontinuous gas exchange in cockroaches

Matthews, Philip G. D. and White, Craig R. (2013) Reversible brain inactivation induces discontinuous gas exchange in cockroaches. Journal of Experimental Biology, 216 11: 2012-2016. doi:10.1242/jeb.077479

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Author Matthews, Philip G. D.
White, Craig R.
Title Reversible brain inactivation induces discontinuous gas exchange in cockroaches
Journal name Journal of Experimental Biology   Check publisher's open access policy
ISSN 0022-0949
Publication date 2013-06
Year available 2013
Sub-type Article (original research)
DOI 10.1242/jeb.077479
Open Access Status File (Publisher version)
Volume 216
Issue 11
Start page 2012
End page 2016
Total pages 5
Place of publication Cambridge, United Kingdom
Publisher The Company of Biologists
Collection year 2014
Language eng
Formatted abstract
Many insects at rest breathe discontinuously, alternating between brief bouts of gas exchange and extended periods of breathholding. The association between discontinuous gas exchange cycles (DGCs) and inactivity has long been recognised, leading to speculation that DGCs lie at one end of a continuum of gas exchange patterns, from continuous to discontinuous, linked to metabolic rate (MR). However, the neural hypothesis posits that it is the downregulation of brain activity and a change in the neural control of gas exchange, rather than low MR per se, which is responsible for the emergence of DGCs during inactivity. To test this, Nauphoeta cinerea cockroaches had their brains inactivated by applying a Peltier-chilled cold probe to the head. Once brain temperature fell to 8°C, cockroaches switched from a continuous to a discontinuous breathing pattern. Re-warming the brain abolished the DGC and re-established a continuous breathing pattern. Chilling the brain did not significantly reduce the cockroaches' MR and there was no association between the gas exchange pattern displayed by the insect and its MR. This demonstrates that DGCs can arise due to a decrease in brain activity and a change in the underlying regulation of gas exchange, and are not necessarily a simple consequence of low respiratory demand.
Keyword Carbon Dioxide Release
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Biological Sciences Publications
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