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First published online June 16, 2004
Journal of Experimental Biology 207, 2671-2678 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.01048

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The evolution of recovery from desiccation stress in laboratory-selected populations of Drosophila melanogaster

Donna G. Folk^* and Timothy J. Bradley

Department of Ecology and Evolutionary Biology, University of California, Irvine, Irvine, CA 92697-2525, USA

View larger version (21K): [in a new window]   Fig. 1. Whole-body water of (A) control flies prior to and following 8 h of desiccation, and following recovery on distilled H2O, saline solution or saline+sucrose solution, and (B) desiccation-resistant flies prior to and following 24 h of desiccation, and following recovery on distilled H2O, saline solution or saline+sucrose solution. Values are means ± S.E.M. of five populations each. Non-matching letters above the columns denote statistically significant differences among treatments.

View larger version (20K): [in a new window]   Fig. 2. Dry mass of (A) control flies prior to and following 8 h of desiccation, and following recovery on distilled H2O, saline solution or saline+sucrose solution, and (B) desiccation-resistant flies prior to and following 24 h of desiccation, and following recovery on distilled H2O, saline solution or saline+sucrose solution. Values are means ± S.E.M. of five populations each. Non-matching letters above the columns denote statistically significant differences among treatments.

View larger version (21K): [in a new window]   Fig. 3. Whole-body sodium content of (A) control flies prior to and following 8 h of desiccation, and following recovery on distilled H2O, saline solution or saline+sucrose solution, and (B) desiccation-resistant flies prior to and following 24 h of desiccation, and following recovery on doubly distilled H2O, saline solution or saline+sucrose solution. [The mean value of the Na+ content following desiccation was estimated in a previous study (Folk and Bradley, 2003). These data were not included in the statistical analysis of this study.] Values are means ± S.E.M. of five populations each. Non-matching letters above the columns denote statistically significant differences among treatments.

View larger version (11K): [in a new window]   Fig. 4. Desiccation resistance of the D and C populations following recovery from an initial bout of desiccation. Values are means ± S.E.M. of five populations within the C or D group. Open bars, D populations; filled bars, C populations. Non-matching letters above the columns signify statistically significant differences among treatments within the C or D group.