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First published online August 9, 2007
Journal of Experimental Biology 210, 2897-2904 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.007591

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Life history consequences of temperature transients in Drosophila melanogaster

Michael E. Dillon^1,*, Liza R. Y. Cahn² and Raymond B. Huey¹

¹ Department of Biology, Box 351800, University of Washington, Seattle, WA 98195-1800, USA
² Department of Biology, Whitman College, Walla Walla, WA 99362, USA

View larger version (7K): [in this window] [in a new window]   Fig. 1. Hypotheses for the effects of thermal transients on fly fitness. See text for descriptions of hypotheses.

View larger version (18K): [in this window] [in a new window]   Fig. 2. Daily fecundity for constant (A) and transient (B) temperature treatments. The mean total number of eggs laid by a female varied with constant temperature treatment (A, inset; different lowercase letters indicate significant differences between treatment groups from Tukey HSD post-hoc comparisons). For the transient treatment groups (B), flies were kept at 25°C except for either 1 or 3 days at 18°C or 1 day at 29°C. The transient temperature data is presented as the percent difference from the control group maintained at constant 25°C. Each point is the mean ± s.e.m. from 15 females (range 13–17) per temperature per day, and points are slightly offset to make error bars visible. P-values from Kruskal–Wallis rank sum tests for each day are shown below each plot; values in bold type are significant at the P=0.05 level. Flies were 3–4 days old on day 1.

View larger version (16K): [in this window] [in a new window]   Fig. 3. Daily egg-to-adult viability (proportion of eggs laid that emerged) for flies experiencing constant (A) and transient (B) temperatures. In B, egg-to-adult viability is shown as the difference between treatment viability and viability at constant 25°C on the same day. Flies were kept at 25°C except for 1 day at 18°C or 29°C and 3 days at 18°C. P values from Kruskal–Wallis rank sum tests for each day are shown below each plot; values in bold are significant at P=0.05 level.

View larger version (13K): [in this window] [in a new window]   Fig. 4. Development times of progeny from adult flies exposed to constant (A) and transient temperature treatments (B). Included in B are control flies held at constant 25°C for the duration of the experiment (circles, thin solid line), flies that experienced 25°C except for 1 day at 18°C (squares, dot-dash line) or 29°C (triangles, dotted line) or 3 days at 18°C (diamonds, broken line). P values from Kruskal–Wallis rank sum tests are shown below plot B; values in bold are significant at P=0.05 level.