| Titre : | Is female investment in defence correlated with breeding success in Hen Harriers Circus cyaneus? (2003) |
| Auteurs : | J. T. Garcia, Auteur |
| Type de document : | Article |
| Dans : | Bird Study (50 JUL 2003) |
| Article en page(s) : | 142-145 |
| Langues: | Anglais |
| Résumé : | Capsule The intensity of parental defence, irrespective of the value of offspring, may be one of the proximate causes of breeding success, reflecting the quality of breeders.' Aims To test whether female Hen Harrier investment in defence towards a human predator influences breeding success. Methods Generalized linear mixed models were used, with nest content, date of visit, the interaction (nest content*date), breeding success (number of fledglings/clutch size) and presence or absence of male as explanatory variables. 'Female' was included as a random variable in the model. Alarm call rate by a female Hen Harrier during the first three minutes after my arrival at a nest was used as a dependent variable (as an indicator of parental investment in defence towards a human predator). Results Females were present and alarmed. in 100% of visits whereas males were present in 37% of visits. The individual variations in female investment in defence, after controlling for the principal determinants of nest defence, were significantly correlated with breeding success of each pair. Conclusion The relationship between female investment in nest defence and reproductive success can be explained through differences in female quality. Good quality females, as measured by the level of investment in nest defence, probably also invested more in other breeding aspects not controlled in this study obtaining higher reproductive success. |
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