Evolution of foraging behaviour in response to chronic malnutrition in Drosophila melanogaster.

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Type
Article: article from journal or magazin.
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Publications
Institution
Title
Evolution of foraging behaviour in response to chronic malnutrition in Drosophila melanogaster.
Journal
Proceedings of the Royal Society of London B Biological Sciences
Author(s)
Vijendravarma R.K., Narasimha S., Kawecki T.J.
ISSN
1471-2954 (Electronic)
ISSN-L
0962-8452
Publication state
Published
Issued date
2012
Peer-reviewed
Oui
Volume
279
Number
1742
Pages
3540-3546
Language
english
Abstract
Chronic exposure to food of low quality may exert conflicting selection pressures on foraging behaviour. On the one hand, more active search behaviour may allow the animal to find patches with slightly better, or more, food; on the other hand, such active foraging is energetically costly, and thus may be opposed by selection for energetic efficiency. Here, we test these alternative hypotheses in Drosophila larvae. We show that populations which experimentally evolved improved tolerance to larval chronic malnutrition have shorter foraging path length than unselected control populations. A behavioural polymorphism in foraging path length (the rover-sitter polymorphism) exists in nature and is attributed to the foraging locus (for). We show that a sitter strain (for(s2)) survives better on the poor food than the rover strain (for(R)), confirming that the sitter foraging strategy is advantageous under malnutrition. Larvae of the selected and control populations did not differ in global for expression. However, a quantitative complementation test suggests that the for locus may have contributed to the adaptation to poor food in one of the selected populations, either through a change in for allele frequencies, or by interacting epistatically with alleles at other loci. Irrespective of its genetic basis, our results provide two independent lines of evidence that sitter-like foraging behaviour is favoured under chronic larval malnutrition.
Keywords
competition, experimental evolution, feeding, nutritional stress, PKG, rover-sitter
Pubmed
Web of science
Open Access
Yes
Create date
21/05/2012 12:00
Last modification date
20/08/2019 13:20
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