The widespread declines of songbirds in rural Britain do not correlate with the spread of their avian predators

D. L. Thomson, R. E. Green, R. D. Gregory, S. R. Baillie

Research output: Contribution to journalArticlepeer-review

70 Citations (Scopus)

Abstract

During the last 30 years, there have been marked declines in the populations of many British songbirds breeding on farmland, while two of their main predators, sparrowhawk (Accipiter nisus) and magpie (Pica pica), have spread back into areas from which they had disappeared. The causes of the songbird declines remain unclear but given the coincidence in timing, it might appear that increased predation could be responsible. Although many studies have failed to find links between changes in the populations of breeding songbirds and mortality from avian predators, previous work has, with few exceptions, involved only short-term studies on small spatial scales. Here we use large-scale, long-term data from a national bird census scheme to examine whether magpies and sparrowhawks could have depressed the rates of year-to-year population change in 23 songbird species. Our results indicate that magpies and sparrowhawks are unlikely to have caused the songbird declines because patterns of year-to-year population change did not differ between sites with and without these predators.

Original languageEnglish
Pages (from-to)2057-2062
Number of pages6
JournalProceedings of the Royal Society B: Biological Sciences
Volume265
Issue number1410
DOIs
Publication statusPublished - Nov 7 1998
Externally publishedYes

Keywords

  • Population declines
  • Predation
  • Rates of population change

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Environmental Science(all)
  • Agricultural and Biological Sciences(all)

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