Special K: Testing the potassium link between radioactive rubidium (⁸⁶Rb) turnover and metabolic rate

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dc.contributor.authorTomlinson, S.
dc.contributor.authorMathialagan, P.D.
dc.contributor.authorMaloney, S.K.
dc.date.issued2014
dc.description.abstractThe measurement of (86)Rb turnover recently has been suggested as a useful method for measuring field metabolic rate in small animals. We investigated a proposed mechanism of (86)Rb turnover, its analogy to K(+), by comparing the turnover of (86)Rb in a model insect, the rhinoceros beetle Xylotrupes gideon, fed a diet of plum jam or plum jam enriched with K(+) or Rb(+). The turnover of (86)Rb in the beetles on the K(+) and the Rb(+) diets was higher than that for beetles on the jam diet (F2,311=32.4; P=1.58×10(-13)). We also exposed the beetles to different ambient temperatures to induce differences in metabolic rate ( ) while feeding them the jam and K(+) diets. was higher at higher ambient temperature (Ta) for both jam (F1,11=14.56; P=0.003) and K(+) (F1,8=15.39; P=0.004) dietary groups, and the turnover of (86)Rb was higher at higher Ta for both jam (F1,11=10.80; P=0.007) and K(+) (F1,8=12.34; P=0.008) dietary groups. There was a significant relationship between (86)Rb turnover and for both the jam (F1,11=35.00; P=1.0×10(-3)) and the K(+) (F1,8=64.33; P=4.3×10(-5)) diets, but the relationship differed between the diets (F1,19=14.07; P=0.001), with a higher (86)Rb turnover in beetles on the K(+)-enriched than on the jam diet at all Ta. We conclude that (86)Rb turnover is related to K(+) metabolism, and that this is the mechanism of the relationship between (86)Rb turnover and . Studies relating (86)Rb turnover to should maintain dietary [K] as close as possible to that of natural diets for the most accurate calibrations for free-ranging animals.
dc.description.statementofresponsibilitySean Tomlinson, Priya D. Mathialagan and Shane K. Maloney
dc.identifier.citationJournal of Experimental Biology, 2014; 217(7):1040-1045
dc.identifier.doi10.1242/jeb.096222
dc.identifier.issn0022-0949
dc.identifier.issn1477-9145
dc.identifier.orcidTomlinson, S. [0000-0003-0864-5391]
dc.identifier.urihttp://hdl.handle.net/2440/124897
dc.language.isoen
dc.publisherCompany of Biologists
dc.relation.granthttp://purl.org/au-research/grants/arc/LP110200304
dc.rights© 2014. Published by The Company of Biologists Ltd.
dc.source.urihttps://doi.org/10.1242/jeb.096222
dc.subject⁸⁶Rb kb; Xylotrupes gideon; insect; isotope turnover; metabolic rate
dc.titleSpecial K: Testing the potassium link between radioactive rubidium (⁸⁶Rb) turnover and metabolic rate
dc.title.alternativeSpecial K: Testing the potassium link between radioactive rubidium ((86)Rb) turnover and metabolic rate
dc.typeJournal article
pubs.publication-statusPublished

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