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First published online April 23, 2004
Journal of Experimental Biology 207, 1797-1802 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.00951

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Preservation of reproductive behaviors during modest cooling: rapid cold-hardening fine-tunes organismal response

Scott M. Shreve¹, Jonathan D. Kelty² and Richard E. Lee, Jr^1,*

¹ Department of Zoology, Miami University, Oxford, OH 45056, USA
² Department of Biology, 230A Brooks Hall, Central Michigan University, Mt Pleasant, MI 48859, USA

View larger version (25K): [in a new window]   Fig. 1. Comparison of the reproductive activity of control versus rapidly cold-hardened (RCH) D. melanogaster tested at 16°C. Immediately prior to the mating trial, RCH pairs (N=20) were acclimated to 16°C for 2 h, while control pairs (N=22) were transferred from 23°C to 16°C immediately prior to the 1-h observation period. Asterisks denote significant differences from control (2, P<0.05).

View larger version (32K): [in a new window]   Fig. 2. Reciprocal test to determine whether rapid cold-hardening (RCH) at 16°C reduced mating performance at the original rearing temperature of 23°C. RCH pairs (N=19) were acclimated at 16°C for 2 h immediately prior to a 1-h mating trial. Control pairs (N=20) were held continuously at 23°C prior to the mating trial.

View larger version (17K): [in a new window]   Fig. 3. Comparison of metabolic rate of D. melanogaster, as measured by CO2 production, for control flies at 23°C and 16°C, and rapidly cold-hardened (RCH) flies at 16°C after a brief exposure (5 min) to 23°C. Error bars represent ± S.E.M. Bars with different letters are significantly different (Bonferroni multiple comparisons test, P<0.0001).