Abstract
Polmunate land snails are subject to stress conditions in their terrestrial habitat, and depend on a range of behavioural, physiological and biochemical adaptations for coping with problems of maintaining water, ionic and thermal balance. The involvement of the heat shock protein (HSP) machinery in land snails was demonstrated following short-term experimental aestivation and heat stress, suggesting that land snails use HSPs as part of their survival strategy. As climatic variation was found to be associated with HSP expression, we tested whether adaptation of land snails to different habitats affects HSP expression in two closely related Sphincterochila snail species, a desert species Sphincterochila zonata and a Mediterranean-type species Sphincterochila cariosa. Our study suggests that Sphincterochila species use HSPs as part of their survival strategy following desiccation and heat stress, and as part of the natural annual cycle of activity and aestivation. Our studies also indicate that adaptation to different habitats results in the development of distinct strategies of HSP expression in response to stress, namely the reduced expression of HSPs in the desert-inhabiting species. We suggest that these different strategies reflect the difference in heat and aridity encountered in the natural habitats, and that the desert species S. zonata relies on mechanisms and adaptations other than HSP induction thus avoiding the fitness consequences of continuous HSP upregulation.
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Acknowledgments
We thank Dr. Carmi Korine for his assistance in desert snail collection. This work was supported by the Israel Science Foundation grant.
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Mizrahi, T., Heller, J., Goldenberg, S. et al. Heat shock proteins and survival strategies in congeneric land snails (Sphincterochila) from different habitats. Cell Stress and Chaperones 17, 523–527 (2012). https://doi.org/10.1007/s12192-012-0341-7
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DOI: https://doi.org/10.1007/s12192-012-0341-7