Chronic malnutrition favours smaller critical size for metamorphosis initiation in Drosophila melanogaster.

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Etat: Public
Version: de l'auteur
ID Serval
serval:BIB_9E21EB827F14
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Chronic malnutrition favours smaller critical size for metamorphosis initiation in Drosophila melanogaster.
Périodique
Journal of Evolutionary Biology
Auteur(s)
Vijendravarma R.K., Narasimha S., Kawecki T.J.
ISSN
1420-9101 (Electronic)
ISSN-L
1010-061X
Statut éditorial
Publié
Date de publication
2012
Peer-reviewed
Oui
Volume
25
Numéro
2
Pages
288-292
Langue
anglais
Résumé
Critical size at which metamorphosis is initiated represents an important checkpoint in insect development. Here, we use experimental evolution in Drosophila melanogaster to test the long-standing hypothesis that larval malnutrition should favour a smaller critical size. We report that six fly populations subject to 112 generations of laboratory natural selection on an extremely poor larval food evolved an 18% smaller critical size (compared to six unselected control populations). Thus, even though critical size is not plastic with respect to nutrition, smaller critical size can evolve as an adaptation to nutritional stress. We also demonstrate that this reduction in critical size (rather than differences in growth rate) mediates a trade-off in body weight that the selected populations experience on standard food, on which they show a 15-17% smaller adult body weight. This illustrates how developmental mechanisms that control life history may shape constraints and trade-offs in life history evolution.
Mots-clé
critical weight, dietary restriction, experimental evolution, life history, starvation resistance, stress tolerance, trade-offs
Pubmed
Web of science
Open Access
Oui
Création de la notice
24/10/2011 15:47
Dernière modification de la notice
20/08/2019 16:04
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