Modelling the time–temperature relationship in cold injury and effect of high-temperature interruptions on survival in a chill-sensitive collembolan |
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Authors: | O NedveD D Lavy & H A Verhoef |
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Institution: | Institute of Entomology, Academy of Sciences of the Czech Republic,,;Faculty of Biological Sciences, University of South Bohemia;Branis˘ovská31, 370 05 C˘eskéBude˘jovice, Czech Republic, and,;Vrije Universiteit, Faculty of Biology, De Boelelaan 1087, 1081 HV, Amsterdam, the Netherlands |
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Abstract: | 1. Temperature- and time-dependent mortalities were studied and modelled in insects exposed in regimes with constant and alternating temperatures. In these experiments, freezing was not a cause of death. 2. Survival rates at a range of constant low temperatures (– 5 to + 1 °C) and for different exposure periods (1–14 days) were measured in the summer acclimated springtail Orchesella cincta . 3. Daily interruptions of the cold exposure with short intervals at high temperature reduced mortality or slowed the increase of mortality. This effect was stronger at higher temperature (19 vs 5 and 12 °C) and increased with the duration of the interruption (0·25–2 h). 4. The injury was reversible when the cold exposure was limited to 2 days. 5. Survival in desiccated animals (14% water loss) was reduced. 6. It is suggested that the mortality of summer acclimated springtails is caused by a complex metabolic disorder and membrane changes at low temperatures. |
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Keywords: | Cold hardiness mortality Orchesella cincta |
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