Breeding Ecology of House Sparrows: Spatial Variation
- 1 January 1978
- journal article
- research article
- Published by Oxford University Press (OUP) in Ornithological Applications
- Vol. 80 (2), 180-193
- https://doi.org/10.2307/1367917
Abstract
Geographic differentiation in breeding ecology of house sparrows [Passer domesticus] between Calgary, Alberta [Canada] and Lawrence, Kansas [USA] is limited primarily to differences in nesting phenology and probability that clutches will be successfully incubated. Breeding begins later but at cooler temperatures in Calgary than in Lawrence. Annual variation in initiation of breeding activities indicates that breeding is not strictly cued to photoperiod or temperature. Breeding continues later in summer in Calgary, ceasing when temperatures start to decline. Cessation of egg laying in Lawrence appears to be associated with high temperatures and dry conditions of mid-summer. General aspects of most study sites, particularly in Calgary, were similar. Yet variation within localities (among farms) was high. These productivity differences probably reflect microenvironmental variation in diversity and abundance of insect prey since variation among farms was particularly high for fledging success. Nest site effects were high only for egg weight. Variation in reproductive output among box-nesting house sparrows could not be attributed to the microenvironment of the nest itself. Geographic patterns in onset and duration of the breeding season and clutch size have been rapidly established since house sparrows were introduced to North America a little over a century ago.This publication has 7 references indexed in Scilit:
- Egg Size, Hatching Asynchrony, Sex, and Brood Reduction in the Common GrackleEcology, 1976
- Latitudinal Trends in the Metabolic Adjustments of the House SparrowEcology, 1976
- Life-History Tactics: A Review of the IdeasThe Quarterly Review of Biology, 1976
- BREEDING SEASONS OF THE HOUSE SPARROW AND TREE SPARROW PASSER SPP. AT OXFORDIbis, 1968
- Temperature regulation and metabolic rhythms in populations of the house sparrow, Passer domesticusComparative Biochemistry and Physiology, 1966
- House Sparrows: Rapid Evolution of Races in North AmericaScience, 1964
- THE BREEDING SEASONS OF AFRICAN BIRDS— 1. LAND BIRDS.Ibis, 1950