Skip to content

Sexual Differences in Conspecific Territorial Defense of Marsh Harriers (Circus-Aeruginosus)

by C Fernandez, P Azkona
Journal of Raptor Research ()


Observations of six pairs of marsh harriers (Circus aeruginosus) in the Upper Ebro Valley (Navarra, Spain) during the incubation and nestling periods showed that: (1) males defended their territories against conspecific intruders more often than females, (2) responses were more frequent to intrascxual as opposed to intersexual intrusions, and (3) frequency of responses between opposite sexes increased when the breeding season progressed. The greater rate of defensive responses of males toward other males and tolerance of females by males at the onset of reproduction supported the idea that conspecific territorial defense during the breeding season functions to protect the nesting area and the pair bond. Alternatively, sex difference may reflect differences in the costs of defense in relation with aerial agility of the sex.

Cite this document (BETA)

Readership Statistics

4 Readers on Mendeley
by Discipline
50% Environmental Science
50% Agricultural and Biological Sciences
by Academic Status
50% Researcher
25% Other
25% Student > Ph. D. Student
by Country
25% Slovakia
25% United States

Sign up today - FREE

Mendeley saves you time finding and organizing research. Learn more

  • All your research in one place
  • Add and import papers easily
  • Access it anywhere, anytime

Start using Mendeley in seconds!

Sign up & Download

Already have an account? Sign in