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• W2140230910 abstract "The availability of water is recognized as the most important determinant of the distribution and activity of terrestrial organisms within the maritime Antarctic. Within this environment, arthropods may be challenged by drought stress during both the austral summer, due to increased temperature, wind, insolation, and extended periods of reduced precipitation, and the winter, as a result of vapor pressure gradients between the surrounding icy environment and the body fluids. The purpose of the present study was to assess the desiccation tolerance of the Antarctic springtail, Cryptopygus antarcticus, under ecologically-relevant conditions characteristic of both summer and winter along the Antarctic Peninsula. In addition, this study examined the physiological changes and effects of mild drought acclimation on the subsequent desiccation tolerance of C. antarcticus. The collembolans possessed little resistance to water loss under dry air, as the rate of water loss was >20% h−1 at 0% relative humidity (RH) and 4 °C. Even under ecologically-relevant desiccating conditions, the springtails lost water at all relative humidities below saturation (100% RH). However, slow dehydration at high RH dramatically increased the desiccation tolerance of C. antarcticus, as the springtails tolerated a greater loss of body water. Relative to animals maintained at 100% RH, a mild drought acclimation at 98.2% RH significantly increased subsequent desiccation tolerance. Drought acclimation was accompanied by the synthesis and accumulation of several sugars and polyols that could function to stabilize membranes and proteins during dehydration. Drought acclimation may permit C. antarcticus to maintain activity and thereby allow sufficient time to utilize behavioral strategies to reduce water loss during periods of reduced moisture availability. The springtails were also susceptible to desiccation at subzero temperatures in equilibrium with the vapor pressure of ice; they lost ∼40% of their total body water over 28 d when cooled to −3.0 °C. The concentration of solutes in the remaining body fluids as a result of dehydration, together with the synthesis of several osmolytes, dramatically increased the body fluid osmotic pressure. This increase corresponded to a depression of the melting point to approximately −2.2 °C, and may therefore allow C. antarcticus to survive much of the Antarctic winter in a cryoprotectively dehydrated state." @default.
• W2140230910 created "2016-06-24" @default.
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• W2140230910 date "2008-10-01" @default.
• W2140230910 modified "2023-10-18" @default.
• W2140230910 title "Desiccation tolerance and drought acclimation in the Antarctic collembolan Cryptopygus antarcticus" @default.
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• W2140230910 doi "https://doi.org/10.1016/j.jinsphys.2008.08.004" @default.
• W2140230910 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18761345" @default.
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