DOI: 10.1007/BF00183309
关键词: Courtship display 、 Ecology 、 Passer 、 Sexual behavior 、 Sparrow 、 Demography 、 Hormone implant 、 Biology 、 Animal ecology
摘要: Badge size, which functions as a signal of dominance status in male house sparrows Passer domesticus, was significantly related to their sexual behavior. Males with large badges participated communal displays (multi-male chases directed towards single females) more often than males small badges, irrespective whether the female involved male's mate or not. Experimentally released females were chased if they fertile nonfertile. Estradiol-implanted control without hormone implant, and estradiol-implanted did badges. Both forced extra-pair copulations during unforced achieved by Male also copulated mates at higher rate A certainty paternity therefore is hypothetized accrue