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Bild på Maria von Post. Foto.

Maria von Post

Postdoctoral fellow

Bild på Maria von Post. Foto.

Effects of supplemental winter feeding on House Sparrows (Passer domesticus) in relation to landscape structure and farming systems in southern Sweden

Author

  • Maria von Post
  • Martin Stjernman
  • Henrik Smith

Summary, in English

CapsuleHouse Sparrow (Passer domesticus) populations in south Swedish farmland are not affected by supplemental winter feeding, irrespective of agricultural landscape type or presence of animal husbandry, although winter populations declined more in mixed farmland and when farms contained animal husbandry. AimsTo investigate whether food limitation of House Sparrow population size during the winter varied spatially in relation to agricultural landscape intensification and farm management. MethodsWe experimentally increased the winter food supply for populations on farmsteads in replicated landscapes that differed in agricultural intensification (open plains versus mixed farming) and/or farm management (crop farming versus animal husbandry), and estimated possible differences in effects on winter population change. ResultsWe found no effect of supplementary winter feeding on changes in House Sparrow population sizes over the winter, irrespective of agricultural landscape type or presence of animal husbandry at the farm. However, we found a significantly larger winter population decline in mixed farmland and when farms contained animal husbandry. ConclusionsThe results suggest that House Sparrow populations in south Swedish farmland are not primarily limited by winter food availability. Alternatively, supplemental winter feeding may augment interspecific competition or attracts predators, offsetting any positive effect on population change. However, the stronger population decline in landscapes in which more breeding resources may be available (animal husbandry farms, mixed farmland), suggests stronger intraspecific competition during the winter in line with the resource separation hypothesis.

Department/s

  • Biodiversity
  • Centre for Environmental and Climate Science (CEC)
  • BECC: Biodiversity and Ecosystem services in a Changing Climate
  • Biodiversity and Conservation Science

Publishing year

2013

Language

English

Pages

238-246

Publication/Series

Bird Study

Volume

60

Issue

2

Document type

Journal article

Publisher

British Trust for Ornithology

Topic

  • Earth and Related Environmental Sciences
  • Ecology

Status

Published

Research group

  • Biodiversity and Conservation Science

ISBN/ISSN/Other

  • ISSN: 0006-3657