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  4. Between-year variation in population sex ratio increases with complexity of the breeding system in Hymenoptera.
 
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Titre

Between-year variation in population sex ratio increases with complexity of the breeding system in Hymenoptera.

Type
article
Institution
UNIL/CHUV/Unisanté + institutions partenaires
Périodique
The American Naturalist  
Auteur(s)
Kümmerli, R.
Auteure/Auteur
Keller, L.
Auteure/Auteur
Liens vers les personnes
Keller, Laurent  
Liens vers les unités
Dép. d'écologie et d'évolution  
Groupe Keller  
ISSN
1537-5323
Statut éditorial
Publié
Date de publication
2011
Volume
177
Numéro
6
Première page
835
Dernière page/numéro d’article
846
Peer-reviewed
Oui
Langue
anglais
Résumé
While adaptive adjustment of sex ratio in the function of colony kin structure and food availability commonly occurs in social Hymenoptera, long-term studies have revealed substantial unexplained between-year variation in sex ratio at the population level. In order to identify factors that contribute to increased between-year variation in population sex ratio, we conducted a comparative analysis across 47 Hymenoptera species differing in their breeding system. We found that between-year variation in population sex ratio steadily increased as one moved from solitary species, to primitively eusocial species, to single-queen eusocial species, to multiple-queen eusocial species. Specifically, between-year variation in population sex ratio was low (6.6% of total possible variation) in solitary species, which is consistent with the view that in solitary species, sex ratio can vary only in response to fluctuations in ecological factors such as food availability. In contrast, we found significantly higher (19.5%) between-year variation in population sex ratio in multiple-queen eusocial species, which supports the view that in these species, sex ratio can also fluctuate in response to temporal changes in social factors such as queen number and queen-worker control over sex ratio, as well as factors influencing caste determination. The simultaneous adjustment of sex ratio in response to temporal fluctuations in ecological and social factors seems to preclude the existence of a single sex ratio optimum. The absence of such an optimum may reflect an additional cost associated with the evolution of complex breeding systems in Hymenoptera societies.
Sujets

social insects

sex allocation

food availability

colony kin structure

worker control versus...

nonadaptive pattern

PID Serval
serval:BIB_4CA0BE9C1D94
DOI
10.1086/659951
PMID
21597259
WOS
000290953000013
Permalien
https://iris.unil.ch/handle/iris/91881
Open Access
Oui
Date de création
2011-02-14T08:59:10.424Z
Date de création dans IRIS
2025-05-20T17:57:22Z
Fichier(s)
En cours de chargement...
Vignette d'image
Nom

BIB_4CA0BE9C1D94.P001.pdf

Version du manuscrit

published

Taille

3.79 MB

Format

Adobe PDF

PID Serval

serval:BIB_4CA0BE9C1D94.P001

URN

urn:nbn:ch:serval-BIB_4CA0BE9C1D947

Somme de contrôle

(MD5):47d3a8247d2f8294f4b90016b22aff05

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