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dc.contributor.authorJumbam, K.R.
dc.contributor.authorJackson, S.
dc.contributor.authorTerblanche, J.S.
dc.contributor.authorMcGeoch, M.A.
dc.contributor.authorChown, S.L.
dc.date.accessioned2010-11-03T09:38:28Z
dc.date.available2010-11-03T09:38:28Z
dc.date.issued2008
dc.identifier.citationJumbam, K.R., Jackson, S., Terblanche, J.S., McGeoch, M.A. and Chown, S.L. (2008). Acclimation effects on critical and lethal thermal limits of workers of theArgentine ant, Linepithema humile. Journal of Insect Physiology, 54, 1008-1014en
dc.identifier.urihttp://hdl.handle.net/123456789/726
dc.description.abstractFor the Argentine ant Linepithema humile, bioclimatic models often predict narrower optimal temperature ranges than those suggested by behavioural and physiological studies. Although water balance characteristics of workers of this species have been thoroughly studied, gaps exist in current understanding of its thermal limits. We investigated critical thermal minima and maxima and upper and lower lethal limits following acclimation to four temperatures (15, 20, 25, 30˚C; 12L:12D photoperiod) in adult workers of the Argentine ant, L. humile, collected from Stellenbosch, South Africa. At an ecologically relevant rate of temperature change of 0.05˚C min-1, CTMax varied between 38 and 40˚C, and CTMin varied between 0 and 0.8 1C. In both cases the response to acclimation was weak. A significant time by exposure temperature interaction was found for upper and lower lethal limits, with a more pronounced effect of acclimation at longer exposure durations. Upper lethal limits varied between 37 and 44˚C, whilst lower lethal limits varied between _4 and _10.5˚C, with an acclimation effect more pronounced for upper than lower lethal limits. A thermal envelope for workers of the Argentine ant is provided, demonstrating that upper thermal limits do likely contribute to distributional limits, but that lower lethal limits and limits to activity likely do not, or at least for workers who are not exposed simultaneously to the demands of load carriage and successful foraging behaviour.en
dc.description.sponsorshipCentre of Excellence for Invasion Biologyen
dc.format.extent342490 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherElsevier Ltd.en
dc.subjectAcclimationen
dc.subjectBioclimatic modellingen
dc.subjectCritical thermal limitsen
dc.subjectKnockdown temperatureen
dc.subjectThermal toleranceen
dc.titleAcclimation effects on critical and lethal thermal limits of workers of theArgentine ant, Linepithema humileen
dc.typeJournalArticlesen
dc.cibjournalJournal of Insect Physiologyen
dc.cibprojectNAen


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