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The Effect Of Thermal Stress On The Mating Behavior Of Three Drosophila Species, Zachary J. Patton, Robert A. Krebs
The Effect Of Thermal Stress On The Mating Behavior Of Three Drosophila Species, Zachary J. Patton, Robert A. Krebs
Biological, Geological, and Environmental Faculty Publications
Selection may act on the weakest link in fitness to change how a species adapts to an environmental stress. For many species, this limitation may be reproduction. After adult Drosophila melanogaster, Drosophila simulans, and Drosophila mojavensis males were exposed to varying levels of thermal stress well below those that endanger life, courtship and mating frequency declined. The regression coefficients of both courtship and mating success did not differ significantly between D. melanogaster and D. simulans males. In contrast, significant differences were present between the two cosmopolitan species and D. mojavensis. Courtship frequency decreased at a much slower rate in D. …
Reduced Enzyme Activity Following Hsp70 Overexpression In Drosophila Melanogaster, Robert A. Krebs, Sari H. Holbrook
Reduced Enzyme Activity Following Hsp70 Overexpression In Drosophila Melanogaster, Robert A. Krebs, Sari H. Holbrook
Biological, Geological, and Environmental Faculty Publications
Acclimation to environmental change can impose costs to organisms. One potential cost is the change in cell metabolism that follows a physiological response, e.g., high expression of heat shock proteins may alter specific activity of important enzymes. We examined the significance of this cost in a pair of Drosophila melanogaster lines transformed with additional copies of a gene that encodes the heat shock protein, Hsp70. Heat shock induces Hsp70 expression in all lines, but lines with extra copies produce much more Hsp70 than do excision control strains. The consequence of this supranormal Hsp70 expression is to reduce specific activity of …