IN A VARIABLE THERMAL ENVIRONMENT SELECTION FAVORS GREATER PLASTICITY OF CELL MEMBRANES IN DROSOPHILA MELANOGASTER

Theory predicts that developmental plasticity, the capacity to change phenotypic trajectory during development, should evolve when the environment varies sufficiently among generations, owing to temporal (e.g., seasonal) variation or to migration among environments. We characterized the levels of ce...

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Bibliographic Details
Published in:Evolution 2012-06, Vol.66 (6), p.1976-1984
Main Authors: Cooper, Brandon S., Hammad, Loubna A., Fisher, Nicholas P., Karty, Jonathan A., Montooth, Kristi L.
Format: Article
Language:English
Subjects:
Acclimation
Acclimatization
Alleles
Animals
Biological Evolution
BRIEF COMMUNICATION
Cell membranes
cellular membranes
developmental plasticity
Drosophila
Drosophila melanogaster
Drosophila melanogaster - genetics
Drosophila melanogaster - metabolism
Drosophila melanogaster - physiology
Evolution
Evolutionary biology
Evolutionary genetics
experimental evolution
Female
Genotype & phenotype
Insects
Lipids
Membrane fluidity
Membrane lipids
Membranes
Phosphatidylcholines - metabolism
Phosphatidylethanolamines - metabolism
Physiology
Temperature
thermal adaptation
Thermal environments
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Summary:Theory predicts that developmental plasticity, the capacity to change phenotypic trajectory during development, should evolve when the environment varies sufficiently among generations, owing to temporal (e.g., seasonal) variation or to migration among environments. We characterized the levels of cellular plasticity during development in populations of Drosophila melanogaster experimentally evolved for over three years in either constant or temporally variable thermal environments. We used two measures of the lipid composition of cell membranes as indices of physiological plasticity (a.k.a. acclimation): (1) change in the ratio of phosphatidylethanolamine (PE) to phosphatidylcholine (PC) and (2) change in lipid saturation (number of double bonds) in cool (16°C) relative to warm (25°C) developmental conditions. Flies evolved under variable environments had a greater capacity to acclimate the PE/PC ratio compared to flies evolved in constant environments, supporting the prediction that environments with high among-generation variance favor greater developmental plasticity. Our results are consistent with the selective advantage of a more environmentally sensitive alíele that may have associated costs in constant environments.
ISSN:0014-3820
1558-5646
DOI:10.1111/j.1558-5646.2011.01566.x