Adaptation to fluctuating environments in a selection experiment with Drosophila melanogaster

Détails

Ressource 1Télécharger: Kubrak_et_al-2017-Ecology_and_Evolution.pdf (595.41 [Ko])
Etat: Public
Version: Final published version
ID Serval
serval:BIB_3AEE75C52078
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Adaptation to fluctuating environments in a selection experiment with Drosophila melanogaster
Périodique
Ecology and Evolution
Auteur(s)
Kubrak O.I., Nylin S., Flatt T., Nässel D.R., Leimar O.
ISSN
2045-7758
Statut éditorial
Publié
Date de publication
2017
Peer-reviewed
Oui
Volume
7
Numéro
11
Pages
3796-3807
Langue
anglais
Résumé
A fundamental question in life-history evolution is how organisms cope with fluctuating environments, including variation between stressful and benign conditions. For short-lived organisms, environments commonly vary between generations. Using a novel experimental design, we exposed wild-derived Drosophila melanogaster to three different selection regimes: one where generations alternated between starvation and benign conditions, and starvation was always preceded by early exposure to cold; another where starvation and benign conditions alternated in the same way, but cold shock sometimes preceded starvation and sometimes benign conditions; and a third where conditions were always benign. Using six replicate populations per selection regime, we found that selected flies increased their starvation resistance, most strongly for the regime where cold and starvation were reliably combined, and this occurred without decreased fecundity or extended developmental time. The selected flies became stress resistant, displayed a pronounced increase in early life food intake and resource storage. In contrast to previous experiments selecting for increased starvation resistance in D. melanogaster, we did not find increased storage of lipids as the main response, but instead that, in particular for females, storage of carbohydrates was more pronounced. We argue that faster mobilization of carbohydrates is advantageous in fluctuating environments and conclude that the phenotype that evolved in our experiment corresponds to a compromise between the requirements of stressful and benign environments.
Mots-clé
experimental evolution, food intake, generalist phenotype, reaction norm, resource storage, starvation resistance
Pubmed
Web of science
Open Access
Oui
Création de la notice
04/07/2017 14:42
Dernière modification de la notice
20/08/2019 14:30
Données d'usage