Seasonality and hormonal control of territorial aggression in female song sparrows (Passeriformes : Emberizidae : Melospiza melodia)

Citation
Mm. Elekonich et Jc. Wingfield, Seasonality and hormonal control of territorial aggression in female song sparrows (Passeriformes : Emberizidae : Melospiza melodia), ETHOLOGY, 106(6), 2000, pp. 493-510
Citations number
65
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences","Neurosciences & Behavoir
Journal title
ETHOLOGY
ISSN journal
0179-1613 → ACNP
Volume
106
Issue
6
Year of publication
2000
Pages
493 - 510
Database
ISI
SICI code
0179-1613(200006)106:6<493:SAHCOT>2.0.ZU;2-M
Abstract
Male and female song sparrows perform similar aggressive behaviors includin g flights, wing-wave threat displays, and growls. Females very rarely sing, however. To investigate the seasonal variation and hormonal control of ter ritorial aggression in females, we simulated female intrusions during the p re-breeding, breeding and post-molt seasons in the field. Circulating level s of testosterone, dihydrotestosterone, estradiol, progesterone and cortico sterone in females experiencing simulated intrusion were compared to those of passively netted females matched for breeding stage. Female aggressive r esponses to female intrusion dropped from the pre-breeding to the post-molt seasons. Levels of circulating androgens were significantly higher in cont rol females than in females experiencing a simulated intrusion. There were no significant differences in any of the other hormones measured. Although song sparrow female-female aggression appears to be behaviorally similar to male-male aggression, the seasonal variation and hormonal support of aggre ssion differ between the sexes.