Covariation between colony social structure and immune defences of workers in the ant Formica selysi

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Serval ID
serval:BIB_03643C5FE63D
Type
Article: article from journal or magazin.
Collection
Publications
Title
Covariation between colony social structure and immune defences of workers in the ant Formica selysi
Journal
Insectes Sociaux
Author(s)
Castella G., Christe P., Chapuisat M.
ISSN
0020-1812
Publication state
Published
Issued date
2010
Peer-reviewed
Oui
Volume
57
Number
2
Pages
233-238
Language
english
Abstract
Several ant species vary in the number of queens per colony, yet the causes and consequences of this variation remain poorly understood. In previous experiments, we found that Formica selysi workers originating from multiple-queen (=polygyne) colonies had a lower resistance to a fungal pathogen than workers originating from single-queen (=monogyne) colonies. In contrast, group diversity improved disease resistance in experimental colonies. This discrepancy between field and experimental colonies suggested that variation in social structure in the field had antagonistic effects on worker resistance, possibly through a down-regulation of the immune system balancing the positive effect of genetic diversity. Here, we examined if workers originating from field colonies with alternative social structure differed in three major components of their immune system. We found that workers from polygyne colonies had a lower bacterial growth inhibitory activity than workers from monogyne colonies. In contrast, workers from the two types of colonies did not differ significantly in bacterial cell wall lytic activity and prophenoloxidase activity. Overall, the presence of multiple queens in a colony correlated with a slight reduction in one inducible component of the immune system of individual workers. This reduced level of immune defence might explain the lower resistance of workers originating from polygyne colonies despite the positive effect of genetic diversity. More generally, these results indicate that social changes at the group level can modulate individual immune defences.
Keywords
Queen number, Polygyny, Immunity, Disease resistance, Social insects
Web of science
Create date
27/01/2010 15:03
Last modification date
20/08/2019 13:25
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