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Cold tolerance of the Australian spur-throated locust, Austracris guttulosa

Woodman, James

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The cold tolerance of overwintering adult Spur-throated locusts, Austracris guttulosa, was examined using measures of supercooling point relative to gender, environmental acclimation and feeding state as well as mortality for a range of sub-zero temperature exposure treatments. Freezing was lethal and supercooling points ranged from -6 to -12.8°C, but were statistically independent of fresh mass, body water content, acclimation, and/or gut content in fed and starved individuals. A significant...[Show more]

dc.contributor.authorWoodman, James
dc.date.accessioned2015-12-10T23:20:11Z
dc.identifier.issn0022-1910
dc.identifier.urihttp://hdl.handle.net/1885/66212
dc.description.abstractThe cold tolerance of overwintering adult Spur-throated locusts, Austracris guttulosa, was examined using measures of supercooling point relative to gender, environmental acclimation and feeding state as well as mortality for a range of sub-zero temperature exposure treatments. Freezing was lethal and supercooling points ranged from -6 to -12.8°C, but were statistically independent of fresh mass, body water content, acclimation, and/or gut content in fed and starved individuals. A significant interaction effect of gender and feeding status showed that the larger bodied females had decreased supercooling capacity with increased food material in the digestive tract. Post-freezing dissections revealed differences in the amount of freshly consumed and retained food material in the digestive tract between fed and starved individuals of each gender, which could explain this effect based on inoculation of ice crystallisation by food particles. Above supercooling temperatures, neither gender nor the rate of cooling had a significant effect on mortality. When cooled from 25°C at 0.1 or 0.5°Cmin-1 to a range of experimental minimum temperatures held for 3h, survival was ≥74% to -7°C, but declined sharply to ≤37% when cooled to -8°C or lower. Although the laboratory experiments reported here suggest that A. guttulosa is not freeze tolerant and unable to rapidly cold harden, exposure to typical cold and frosty nights that very rarely reach below -8°C as a night minimum in the field would be unlikely to cause mortality in the vast majority of overwintering aggregations.
dc.publisherElsevier
dc.sourceJournal of Insect Physiology
dc.subjectKeywords: water; acclimation; adaptation; adult; aggregation behavior; cold tolerance; crystallization; feeding behavior; grasshopper; low temperature; mortality; water content; adaptation; animal; article; body weight; female; freezing; gastrointestinal tract; gra Acclimation; Cold hardiness; Feeding; Freezing; Insect; Low temperature; Pre-freeze mortality; Total body water content
dc.titleCold tolerance of the Australian spur-throated locust, Austracris guttulosa
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume58
dc.date.issued2012
local.identifier.absfor060603 - Animal Physiology - Systems
local.identifier.absfor060808 - Invertebrate Biology
local.identifier.ariespublicationf5625xPUB1244
local.type.statusPublished Version
local.contributor.affiliationWoodman, James, College of Medicine, Biology and Environment, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage384
local.bibliographicCitation.lastpage390
local.identifier.doi10.1016/j.jinsphys.2011.12.015
local.identifier.absseo970105 - Expanding Knowledge in the Environmental Sciences
dc.date.updated2016-02-24T08:41:41Z
local.identifier.scopusID2-s2.0-84857793530
local.identifier.thomsonID000302040200012
CollectionsANU Research Publications

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