The effects of acclimation on thermal tolerance, desiccation resistance and metabolic rate in Chirodica chalcoptera (Coleoptera: Chrysomelidae)

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dc.contributor.authorTerblanche J.S.
dc.contributor.authorSinclair B.J.
dc.contributor.authorKlok C.J.
dc.contributor.authorMcFarlane M.L.
dc.contributor.authorChown S.L.
dc.date.accessioned2011-05-15T15:59:38Z
dc.date.available2011-05-15T15:59:38Z
dc.date.issued2005
dc.description.abstractDespite much focus on species responses to environmental variation through space and time, many higher taxa and geographic areas remain poorly studied. We report the effects of temperature acclimation on thermal tolerance, desiccation rate and metabolic rate for adult Chirodica chalcoptera (Coleoptera: Chrysomelidae) collected from Protea nerifolia inflorescences in the Fynbos Biome in South Africa. After 7 days of acclimation at 12, 19 and 25°C, critical thermal maxima (mean±s.e.: 41.8±0.2°C in field-fresh beetles) showed less response (<1°C change) to temperature acclimation than did the onset of the critical thermal minima (0.1±0.2, 1.0±0.2 and 2.3±0.2°C, respectively). Freezing was lethal in C. chalcoptera (field-fresh SCP -14.6°C) and these beetles also showed pre-freeze mortality. Survival of 2 h at -10.1°C increased from 20% to 76% after a 2 h pre-exposure to -2°C, indicating rapid cold hardening. Metabolic rate, measured at 25°C and adjusted by ANCOVA for mass variation, did not differ between males and females (2.772±0.471 and 2.517±0.560 ml CO2 h-1, respectively), but was higher in 25°C-acclimated beetles relative to the field-fresh and 12°C-acclimated beetles. Body water content and desiccation rate did not differ between males and females and did not respond significantly to acclimation. We place these data in the context of measured inflorescence and ambient temperatures, and predict that climate change for the region could have effects on this species, in turn possibly affecting local ecosystem functioning. © 2005 Elsevier Ltd. All rights reserved.
dc.description.versionArticle
dc.identifier.citationJournal of Insect Physiology
dc.identifier.citation51
dc.identifier.citation9
dc.identifier.issn221910
dc.identifier.other10.1016/j.jinsphys.2005.04.016
dc.identifier.urihttp://hdl.handle.net/10019.1/11284
dc.subjectacclimation
dc.subjectbeetle
dc.subjectdesiccation
dc.subjectenvironmental change
dc.subjectfynbos
dc.subjectmetabolism
dc.subjecttemperature tolerance
dc.subjectacclimatization
dc.subjectanimal
dc.subjectarticle
dc.subjectbeetle
dc.subjectbody weight
dc.subjectcold
dc.subjectdesiccation
dc.subjectenergy metabolism
dc.subjectmetabolism
dc.subjectphysiology
dc.subjectwater deprivation
dc.subjectAcclimatization
dc.subjectAnimals
dc.subjectBeetles
dc.subjectBody Weight
dc.subjectCold
dc.subjectDesiccation
dc.subjectEnergy Metabolism
dc.subjectWater Deprivation
dc.subjectAfrica
dc.subjectEastern Hemisphere
dc.subjectSouth Africa
dc.subjectSouthern Africa
dc.subjectSub-Saharan Africa
dc.subjectWorld
dc.subjectChrysomelidae
dc.subjectColeoptera
dc.subjectProtea
dc.titleThe effects of acclimation on thermal tolerance, desiccation resistance and metabolic rate in Chirodica chalcoptera (Coleoptera: Chrysomelidae)
dc.typeArticle
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