Tag: Savannah Sparrow

Post-mortem digestion of stomach contents in the Savannah Sparrow

Savannah Sparrow (Passerculus sandwichensis) Science Article 7 abstract Van Koersveld (Proc. 10th Intern. Ornith. Congr.: 592-594,1 951) demonstrated that digestion in Corvidae continues for 20 to 30 minutes after death unless stopped in somemanner. He also demonstrated that soft-bodied forms such as earthworms were completely digested within that time and wireworm larvae were nearly gone […]

FIFTY:FIFTY OFFSPRING SEX RATIOS IN SAVANNAH SPARROWS (PASSERCULUS SANDWICHENSIS)

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. […]

SEXUAL DIMORPiHSM AND POPUIATION SEX RATIOS IN JUVENILE SAVANNAH SPARROWS

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 […]

Intraspecific Nest Parasitism in the Savannah Sparrow

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 […]

THE FLEXIBLE MIGRATORY ORIENTATION SYSTEM OF THE SAVANNAH SPARROW (PASSERCULUS SANDWICHENSIS)

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, […]

SUBSPECIFIC VARIATION IN WINTER POPULATIONS OF SPARROWS: A STUDY IN FIELD TAXONOMY

Savannah Sparrow (Passerculus sandwichensis) Science Article 9 abstract In 1951 an extensive area in Aiken and Barnwell counties, South Carolina, was selected as the site for the Savannah River Plant, whose genesis and general management fall within the province of the United States Atomic Energy Commission and whose construction, maintenance, and operation are due, in […]

Proficient incubation by inexperienced SavannahSparrows Passerculus sandwichensis

Savannah Sparrow (Passerculus sandwichensis) Science Article 3 abstract We compared the incubation behaviour of 1-year-old female Savannah Sparrows Passerculussandwichensis nesting for the first time with that of older females that had nested in previousyears on Kent Island, New Brunswick, Canada. Using temperature probes inserted into 32nests, we determined the length and variability of incubation shifts […]

GEOGRAPHIC VARIATION IN EASTERN NORTH AMERICAN SAVANNAH SPARROWS

Savannah Sparrow (Passerculus sandwichensis) Science Article 4 abstract In attempting to identify Ohio specimens of the Savannah sparrow, the writer was confronted with the usual difficult problem familiar to investigators in this confusing group of birds. He was not long in discovering what had already been suspected, that more than one geographic race is represented […]

Savannah Sparrow (Passerculus sandwichensis)

[order] PASSERIFORMES | [family] Emberizidae | [latin] Passerculus sandwichensis | [UK] Savannah Sparrow | [FR] Pinson des pres | [DE] Grasammer | [ES] Gorrion zanjero | [NL] Savannahgors Subspecies Genus Species subspecies Breeding Range Breeding Range 2 Non Breeding Range Ammodramus sandwichensis Passerculus sandwichensis NA, MA Canada to Guatemala Passerculus sandwichensis alaudinus Passerculus sandwichensis anulus […]