Environmental temperature alters the overall digestive energetics and differentially affects dietary protein and lipid use in a lizard

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dc.contributor.authorPlasman, Melissaen_ZA
dc.contributor.authorMcCue, Marshall D.en_ZA
dc.contributor.authorReynoso, Vı́ctor Hugoen_ZA
dc.contributor.authorTerblanche, John S.en_ZA
dc.contributor.authorClusella-Trullas, Susanaen_ZA
dc.date.accessioned2019-04-11T13:35:37Z
dc.date.available2019-04-11T13:35:37Z
dc.date.issued2019
dc.descriptionCITATION: Plasman, M., et al. 2019. Environmental temperature alters the overall digestive energetics and differentially affects dietary protein and lipid use in a lizard. Journal of Experimental Biology, 222:1-9, doi:10.1242/jeb.194480.en_ZA
dc.descriptionThe original publication is available at http://jeb.biologists.orgen_ZA
dc.description.abstractProcessing food (e.g. ingestion, digestion, assimilation) requires energy referred to as specific dynamic action (SDA) and is at least partially fuelled by oxidation of the nutrients (e.g. proteins and lipids) within the recently ingested meal. In ectotherms, environmental temperature can affect the magnitude and/or duration of the SDA, but is likely to also alter the mixture of nutrients that are oxidized to cover these costs. Here, we examined metabolic rate, gut passage time, assimilation efficiency and fuel use in the lizard Agama atra digesting cricket meals at three ecologically relevant temperatures (20, 25 and 32°C). Crickets were isotopically enriched with 13C-leucine or 13C-palmitic-acid tracers to distinguish between protein and lipid oxidation, respectively. Our results show that higher temperatures increased the magnitude of the SDA peak (by 318% between 32 and 20°C) and gut passage rate (63%), and decreased the duration of the SDA response (by 20% for males and 48% for females). Peak rate of dietary protein oxidation occurred sooner than peak lipid oxidation at all temperatures (70, 60 and 31 h earlier for 20, 25 and 32°C, respectively). Assimilation efficiency of proteins, but not lipids, was positively related to temperature. Interestingly, the SDA response exhibited a notable circadian rhythm. These results show that temperature has a pronounced effect on digestive energetics in A. atra, and that this effect differs between nutrient classes. Variation in environmental temperatures may thus alter the energy budget and nutrient reserves of these animals.en_ZA
dc.description.urihttp://jeb.biologists.org/content/222/6/jeb194480
dc.description.versionPublisher's versionen_ZA
dc.description.versionThe Company of Biologistsen_ZA
dc.format.extent9 pages : illustrationsen_ZA
dc.identifier.citationPlasman, M., et al. 2019. Environmental temperature alters the overall digestive energetics and differentially affects dietary protein and lipid use in a lizard. Journal of Experimental Biology, 222:1-9, doi:10.1242/jeb.194480en_ZA
dc.identifier.issn1477-9145 (online)
dc.identifier.issn0022-0949 (print)
dc.identifier.otherdoi:10.1242/jeb.194480 Published 18
dc.identifier.urihttp://hdl.handle.net/10019.1/105560
dc.language.isoen_ZAen_ZA
dc.publisherThe Company of Biologistsen_ZA
dc.subjectStable isotopesen_ZA
dc.subjectLizards (Agama atra) -- Digestionen_ZA
dc.subjectLizards (Agama atra) -- Nutritionen_ZA
dc.subjectDigestive energetics in Agama atra -- Effect of temperature onen_ZA
dc.subjectSpecific dynamic action (SDA)en_ZA
dc.titleEnvironmental temperature alters the overall digestive energetics and differentially affects dietary protein and lipid use in a lizarden_ZA
dc.typeArticleen_ZA
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