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Oxygen safety margins set thermal limits in an insect model system

dc.contributor.authorBoardman, Leighen_ZA
dc.contributor.authorTerblanche, John S.en_ZA
dc.date.accessioned2016-10-07T08:44:10Z
dc.date.available2016-10-07T08:44:10Z
dc.date.issued2015-03
dc.identifier.citationBoardman, L. & Terblanche, J. S. 2015. Oxygen safety margins set thermal limits in an insect model system. Journal of Experimental Biology, 218:1677-1685, doi:10.1242/jeb.120261.
dc.identifier.issn1477-9145 (online)
dc.identifier.issn0022-0949 (print)
dc.identifier.otherdoi:10.1242/jeb.120261
dc.identifier.urihttp://hdl.handle.net/10019.1/99706
dc.descriptionCITATION: Boardman, L. & Terblanche, J. S. 2015. Oxygen safety margins set thermal limits in an insect model system. Journal of Experimental Biology, 218:1677-1685, doi:10.1242/jeb.120261.
dc.descriptionThe original publication is available at http://jeb.biologists.org
dc.description.abstractA mismatch between oxygen availability and metabolic demand may constrain thermal tolerance. While considerable support for this idea has been found in marine organisms, results from insects are equivocal and raise the possibility that mode of gas exchange, oxygen safety margins and the physico-chemical properties of the gas medium influence heat tolerance estimates. Here, we examined critical thermal maximum (CTmax) and aerobic scope under altered oxygen supply and in two life stages that varied in metabolic demand in Bombyx mori (Lepidoptera: Bombycidae). We also systematically examined the influence of changes in gas properties on CTmax. Larvae have a lower oxygen safety margin (higher critical oxygen partial pressure at which metabolism is suppressed relative to metabolic demand) and significantly higher CTmax under normoxia than pupae (53°C vs 50°C). Larvae, but not pupae, were oxygen limited with hypoxia (2.5 kPa) decreasing CTmax significantly from 53 to 51°C. Humidifying hypoxic air relieved the oxygen limitation effect on CTmax in larvae, whereas variation in other gas properties did not affect CTmax. Our data suggest that oxygen safety margins set thermal limits in air-breathing invertebrates and the magnitude of this effect potentially reconciles differences in oxygen limitation effects on thermal tolerance found among diverse taxa to date.en_ZA
dc.description.urihttp://jeb.biologists.org/content/218/11/1677
dc.format.extent9 pages : illustrationsen_ZA
dc.language.isoen_ZAen_ZA
dc.publisherThe Company of Biologists
dc.subjectBombyx morien_ZA
dc.subjectThermolimit respirometryen_ZA
dc.subjectCritical temperatureen_ZA
dc.subjectSupply and demanden_ZA
dc.subjectOxygen and capacity-limited thermal toleranceen_ZA
dc.titleOxygen safety margins set thermal limits in an insect model systemen_ZA
dc.typeArticleen_ZA
dc.description.versionPublisher's version
dc.rights.holderThe Company of Biologists


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