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  • Title: HSP70 expression in the Copper butterfly Lycaena tityrus across altitudes and temperatures.
    Author: Karl I, Sørensen JG, Loeschcke V, Fischer K.
    Journal: J Evol Biol; 2009 Jan; 22(1):172-8. PubMed ID: 19120817.
    Abstract:
    The ability to express heat-shock proteins (HSP) under thermal stress is an essential mechanism for ectotherms to cope with unfavourable conditions. In this study, we investigate if Copper butterflies originating from different altitudes and/or being exposed to different rearing and induction temperatures show differences in HSP70 expression. HSP70 expression increased substantially at the higher rearing temperature in low-altitude butterflies, which might represent an adaptation to occasionally occurring heat spells. On the other hand, high-altitude butterflies showed much less plasticity in response to rearing temperatures, and overall seem to rely more on genetically fixed thermal stress resistance. Whether the latter indicates a higher vulnerability of high-altitude populations to global warming needs further investigation. HSP70 expression increased with both colder and warmer induction temperatures.
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