Evolution of supercolonies: the Argentine ants of southern Europe

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Version: de l'auteur
ID Serval
serval:BIB_0ECAE85DC49F
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Evolution of supercolonies: the Argentine ants of southern Europe
Périodique
Proceedings of the National Academy of Sciences of the United States of America
Auteur(s)
Giraud T., Pedersen J. S., Keller L.
ISSN
0027-8424
Statut éditorial
Publié
Date de publication
04/2002
Peer-reviewed
Oui
Volume
99
Numéro
9
Pages
6075-9
Notes
IZEAID9E733312923B_ Journal Article Research Support, Non-U.S. Gov't --- Old month value: Apr 30
Résumé
Some ants have an extraordinary social organization, called unicoloniality, whereby individuals mix freely among physically separated nests. This type of social organization is not only a key attribute responsible for the ecological domination of these ants, but also an evolutionary paradox and a potential problem for kin selection theory because relatedness between nest mates is effectively zero. The introduction of the Argentine ant in Europe was apparently accompanied by a dramatic loss of inter-nest aggression and the formation of two immense supercolonies (which effectively are two unicolonial populations). Introduced populations experienced only limited loss of genetic diversity at neutral markers, indicating that the breakdown of recognition ability is unlikely to be merely due to a genetic bottleneck. Rather, we suggest that a "genetic cleansing" of recognition cues occurred after introduction. Indeed workers of the same supercolony are never aggressive to each other despite the large geographical distance and considerable genetic differentiation between sampling sites. By contrast, aggression is invariably extremely high between the two supercolonies, indicating that they have become fixed for different recognition alleles. The main supercolony, which ranges over 6,000 km from Italy to the Spanish Atlantic coast, effectively forms the largest cooperative unit ever recorded.
Mots-clé
Aggression Alleles Animals Ants/genetics/physiology Europe *Evolution Variation (Genetics)
Pubmed
Web of science
Open Access
Oui
Création de la notice
24/01/2008 18:40
Dernière modification de la notice
20/08/2019 12:35
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