Cookies 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

Demography and the Evolution of Cooperative Breeding in the Bicolored Wren, Campylorhynchus Griseus

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

$30.00+ Tax (if applicable)
Add to Favorites

image of Behaviour

1. Two adjacent populations of the bicolored wren differ significantly in social structure. In one population 83% of groups consist of unaided pairs. The rest contain, in addition, a single male nonreproductive helper. About 43% of the groups in the other population consist of unaided pairs. The rest contain from one to three helpers, and helpers may be of either sex. 2. Helpers are always individuals who have failed to disperse from their natal territory. In both populations they augment group reproductive success and reduce mortality among the breeding pair, although a single helper produces a reproductive enhancement as great as that of multiple helpers. 3. Group-size-specific reproduction and adult mortality do not differ between the populations, but juvenile mortality and average territory size differ significantly. 4. The population consequences of these differences suggest that group size is held below its optimum in one habitat by high juvenile mortality, whereas habitat saturation is probably responsible for the fact that about one-third of all groups in the second habitat contain more than an optimum number of members. 5. These demographic parameters suggest that habitat saturation is not a necessary condition for the maintenance of helping behavior in either population.


Article metrics loading...


Affiliations: 1: Department of Biological Sciences, Purdue University, West Lafayette, IN 47907, U.S.A.


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
    Your details
    Why are you recommending this title?
    Select reason:
    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