Song Sparrow (Melospiza melodia) Science Article 1 abstract In urban environments, anthropogenic noise may mask bird song,especially the notes occurring at lower frequencies (1

Song Sparrow (Melospiza melodia) Science Article 9 abstract Complex birdsong is a classic example of a sexually selected ornamental trait. In many species, femalesprefer males with large song repertoires, possibly because repertoire size is limited by the size of songcontrol nuclei which reflect developmental success Jeremy A. Pfaff et al, Proc. R. Soc. B (2007) […]

Song Sparrow (Melospiza melodia) Science Article 8 abstract Models of sexual selection propose that exaggerated secondarysexual ornaments indicate a male’s own fitness and the fitnessof his offspring. These hypotheses have rarely been thoroughly testedin free-living individuals because overall fitness Jane M. Reid et al, Am. Nat. 2005. Vol. 165, 2005 Download article download full text […]

Song Sparrow (Melospiza melodia) Science Article 4 abstract We manipulated the quantity of food provided to hand-reared song sparrows Melospizamelodia from 3 to 18 days post-hatching, a period when young birds in the wild areespecially likely to experience nutritional stress. A control group was given unlimitedfood, while an experimental group was limited to 60% of […]

Song Sparrow (Melospiza melodia) Science Article 15 abstract Two genetic consequences are often considered evidence of a founder effect: substantialloss in genetic diversity and rapid divergence between source and founder populations.Single-step founder events have been studied for these effects CHRISTIN L. PRUETT and KEVIN WINKER, Molecular Ecology (2005) 14 , 1421-1434 Download article download full […]

Song Sparrow (Melospiza melodia) Science Article 7 abstract We compared the songs of young male song sparrows, Melospiza melodia, in the early

Savannah Sparrow (Passerculus sandwichensis) Science Article 2 abstract Over a 14 year period, we determined offspring sex ratios in a population ofSavannah Sparrows (Passerculus sandwichensis) breeding on Kent Island, an isolated 80 ha islandin the Bay of Fundy, New Brunswick, Canada, based on morphological measurements of318 independent juveniles and 361 returning adults of known parentage. […]

Savannah Sparrow (Passerculus sandwichensis) Science Article 8 abstract Savannah Sparrows (Passerculus sandwichensis) breeding on Kent Island, New Brunswick, Canada, are polygynous and sexually dimorphic in size. The sex of 7-d-old nestlingscannot be reliably identified by size alone, but juveniles begin to display clear sexualdimorphism in size by the time they reach independence, several weeks after […]

Savannah Sparrow (Passerculus sandwichensis) Science Article 6 abstract Evidence of intraspecific nest parasitism in passetines is rare although some well documented cases do exist (Yom-Tov et al. 1974, Ibis 116: 87-90). This note describes an incident whose circumstances suggest that two complete clutches were laid simultaneously in the same nest by two female Savannah Sparrows […]

Savannah Sparrow (Passerculus sandwichensis) Science Article 1 abstract The orientation system of the Savannah sparrow (Passerculus sandwichensis) is typical of nocturnal migrant passerine birds. It is based on a system of interacting compass senses: magnetic, star, polarized light and, perhaps, sun compasses. The magnetic compass capability develops in birds that have never seen the sky, […]