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Science 20 May 2005:
Vol. 308. no. 5725, p. 1148
DOI: 10.1126/science.1111331
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A Cost of Long-Term Memory in Drosophila

Frederic Mery* and Tadeusz J. Kawecki

Two distinct forms of consolidated associative memory are known in Drosophila: long-term memory and so-called anesthesia-resistant memory. Long-term memory is more stable, but unlike anesthesia-resistant memory, its formation requires protein synthesis. We show that flies induced to form long-term memory become more susceptible to extreme stress (such as desiccation). In contrast, induction of anesthesia-resistant memory had no detectable effect on desiccation resistance. This finding may help to explain why evolution has maintained anesthesia-resistant memory as another form of consolidated memory, distinct from long-term memory.

Section of Ecology and Evolution, Department of Biology, University of Fribourg, Chemin du Musée 10, CH-1700 Fribourg, Switzerland.

* To whom correspondence should be addressed. E-mail: frederic.mery{at}unifr.ch

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