Evolution of faster development does not lead to greater fluctuating asymmetry of sternopleural bristle number in Drosophila.
J Genet
;
2001 Apr; 80(1): 1-7
Artículo
en Inglés
| IMSEAR
| ID: sea-114405
ABSTRACT
Both strong directional selection and faster development are thought to destabilize development, giving rise to greater fluctuating asymmetry (FA), although there is no strong empirical evidence supporting this assertion. We compared FA in sternopleural bristle number in four populations of Drosophila melanogaster successfully selected for faster development from egg to adult, and in four control populations. The fraction of perfectly symmetric individuals was higher in the selected populations, whereas the FA levels did not differ significantly between selected and control populations, clearly indicating that directional selection for faster development has not led to increased FA in sternopleural bristle number in these populations. This may be because (i) development time and FA are uncorrelated, (ii) faster development does result in FA, but selection has favoured developmentally stable individuals that can develop fast and still be symmetrical, or (iii) the increased fraction of symmetric individuals in the selected populations is an artifact of reduced body size. Although we cannot discriminate among these explanations, our results suggest that the relationship between development time, FA and fitness may be far more subtle than often thought.
Texto completo:
Disponible
Índice:
IMSEAR (Asia Sudoriental)
Asunto principal:
Selección Genética
/
Drosophila melanogaster
/
Evolución Biológica
/
Animales
Idioma:
Inglés
Revista:
J Genet
Año:
2001
Tipo del documento:
Artículo
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