Diurnal variation in supercooling points of three species of Collembola from Cape Hallett, Antarctica

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dc.contributor.authorSinclair B.J.
dc.contributor.authorKlok C.J.
dc.contributor.authorScott M.B.
dc.contributor.authorTerblanche J.S.
dc.contributor.authorChown S.L.
dc.date.accessioned2011-05-15T15:59:39Z
dc.date.available2011-05-15T15:59:39Z
dc.date.issued2003
dc.description.abstractDaily changes in microclimate temperature and supercooling point (SCP) of Collembola were measured during summer at Cape Hallett, North Victoria Land, Antarctica. Isotoma klovstadi and Cryptopygus cisantarcticus (Isotomidae) showed bimodal SCP distributions, predominantly in the high group during the day and in the low group during the night. There were no concurrent diurnal changes in water content or haemolymph osmolality. By contrast, Friesea grisea (Neanuridae) had a unimodal distribution of SCPs that was invariant between daytime and nighttime. Isotoma klovstadi collected foraging on moss had uniformly high SCPs, which shifted towards the low group when the animals were starved for 2-8 h. When I. klovstadi was acclimated for five days with lichen or algae, SCPs were higher than if they were supplied with moss, while those that were starved (with free water or 100% relative humidity) displayed a trimodal SCP distribution. A variety of pre-treatments, including cold, heat, desiccation and slow cooling were ineffective at inducing SCP shifts in C. cisantarcticus or I. klovstadi. It is postulated that behavioural avoidance of low temperatures by vertical migration may be key in I. klovstadi's short-term survival of nighttime temperatures. These data suggest that the full range of thermal responses of Antarctic Collembola is yet to be elucidated. © 2003 Elsevier Ltd. All rights reserved.
dc.description.versionArticle
dc.identifier.citationJournal of Insect Physiology
dc.identifier.citation49
dc.identifier.citation11
dc.identifier.issn221910
dc.identifier.other10.1016/j.jinsphys.2003.08.002
dc.identifier.urihttp://hdl.handle.net/10019.1/11290
dc.subjectmicroclimate
dc.subjectacclimatization
dc.subjectanimal
dc.subjectanimal food
dc.subjectAntarctica
dc.subjectarthropod
dc.subjectarticle
dc.subjectbody water
dc.subjectcircadian rhythm
dc.subjectcold
dc.subjecthemolymph
dc.subjectmetabolism
dc.subjectosmolarity
dc.subjectphysiology
dc.subjectseason
dc.subjectstarvation
dc.subjectstatistical distribution
dc.subjecttemperature
dc.subjecttime
dc.subjectAcclimatization
dc.subjectAnimal Nutrition Physiology
dc.subjectAnimals
dc.subjectAntarctic Regions
dc.subjectArthropods
dc.subjectBody Water
dc.subjectCircadian Rhythm
dc.subjectCold
dc.subjectHemolymph
dc.subjectOsmolar Concentration
dc.subjectSeasons
dc.subjectStarvation
dc.subjectStatistical Distributions
dc.subjectTemperature
dc.subjectTime Factors
dc.subjectalgae
dc.subjectAnimalia
dc.subjectBryophyta
dc.subjectCollembola
dc.subjectCryptopygus
dc.subjectFriesea
dc.subjectFriesea grisea
dc.subjectIsotoma klovstadi
dc.subjectIsotomidae
dc.subjectNeanuridae
dc.subjectVictoria
dc.titleDiurnal variation in supercooling points of three species of Collembola from Cape Hallett, Antarctica
dc.typeArticle
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