Cookies Policy
X
Cookie Policy

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

Age and relatedness have an interactive effect on the feeding behaviour of helpers in cooperatively breeding sociable weavers

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
MyBook is a cheap paperback edition of the original book and will be sold at uniform, low price.

Buy this article

Price:
$30.00+ Tax (if applicable)
Add to Favorites

In cooperative species, helpers often assist close relatives and kin selection is thought to be a major selective force underlying the evolution and maintenance of helping. However, in some cases helpers may be unrelated individuals, which require other types of explanation. Here, we used genetic analyses and observations of feeding behaviour to investigate the relationships between helping at the nest and relatedness in a species where helpers vary in their relatedness to the breeders, the sociable weaver, Philetairus socius. We also investigated the effect of age and breeding group size on feeding behaviour. We found no overall increase of feeding rate with relatedness. Instead, the relationship between helpers' feeding rate and relatedness changed with age. Yearling helpers, which were typically the offspring of one or both parents, did not feed significantly more often when more related to the nestlings or the breeding male or female but did bring larger prey when more related to the nestlings or breeding female. For adult helpers, contrary to the expectations of the kin selection hypothesis, the feeding rate and the size of the prey brought was negatively linked to their relatedness to the nestlings and the breeding female. These results suggest that the reasons for helping in this population change with age. Indirect benefits seem important for yearling helpers while direct benefits may influence the evolution and maintenance of helping behaviour in adult helpers.

Loading

Article metrics loading...

/content/journals/10.1163/000579511x608701
2011-11-01
2015-04-01

Affiliations: 1: CEFE-CNRS, Montpellier, France, Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, Cape Town, South Africa;, Email: claire.doutrelant@cefe.cnrs.fr; 2: IRD, UMR CBGP (INRA/IRD/Cirad/Montpellier SupAgro), Campus International de Baillarguet, CS 30016, 34988 Montferrier-sur-Lez, France; 3: CEFE-CNRS, Montpellier, France, Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, Cape Town, South Africa, CIBIO, Research Centre in Biodiversity and Genetic Resources, Vairão, Portugal, Biology Department, Science Faculty, University of Porto, Porto, Portugal

Sign-in

Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to email alerts
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Name:*
    Email:*
    Your details
    Name:*
    Email:*
    Department:*
    Why are you recommending this title?
    Select reason:
     
     
     
     
    Other:
     
    Behaviour — Recommend this title to your library

    Thank you

    Your recommendation has been sent to your librarian.

  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation