Sex-specific foraging distributions of brown boobies in the eastern tropical Pacific

  • Gilardi J
  • 25


    Mendeley users who have this article in their library.
  • N/A


    Citations of this article.


This study investigates sex differences in the distribution of foraging Brown Boobies (Sula leucogaster) near Clipperton Island in the eastern tropical Pacific. Females tended to forage farther from shore than males: eg., the sex ratio varied from strongly male-biased near the colony (within ∼20 km) to female-biased away from the colony (beyond ∼90 km). Males also returned to the colony earlier in the evening than females, again suggesting more proximate foraging locations in males. An hypothesis linking these foraging differences to sex role partitioning and sexual size dimorphism is proposed. Selection on females for increased chick provisioning may have lead to increased size and foraging range. Conversely, males are selected to remain close to the colony to maintain territories and prevent or acquire extra-pair copulations, thus reducing their foraging range and body size.

Author-supplied keywords

  • -brown booby
  • 1
  • 148-151
  • 1992
  • colonial waterbirds 15
  • foraging
  • occur in a range
  • of avian taxa
  • parental investment
  • passerines
  • sex-related distributional differences
  • sexual dimorphism
  • sula leucogaster

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


  • James D Gilardi

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free