Journal of Thermal Biology
To help us understand how adaptive tolerance to heat stress has evolved, we made F1 hybrid crosses and backcrosses amongst populations of Drosophila mojavensis, and tested their ability to fly after exposure to a debilitating, but non-lethal, heat stress. Previous work identified that these populations vary in thermotolerance as measured for a variety of traits. Hybrid superiority was observed when crossing all four pairs of strains. Patterns of inheritance in flight ability after stress varied depending on which strains were used to set up complete reciprocal backcrosses, and, for both population pairs, results supported a multigenic model. This quantitative inheritance may be an outcome of the many different physiological and biochemical systems recently shown to influence muscle activity during heat stress. Therefore, the ability to maintain flight in the presence of high temperatures has the potential to vary considerably among populations in nature. As effects occur at temperatures well below those causing mortality, variation in this trait may greatly impact organismal fitness.
NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Thermal Biology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Thermal Biology, 30,4, )May 2005) DOI 10.1016/j.jtherbio.2005.02.002
Krebs RA and Thompson KA. 2005. A genetic analysis of variation for the ability to fly after exposure to thermal stress in drosophila mojavensis. J Therm Biol 30(4):335-42.