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Fluctuations and trends in numbers of staging waterbirds in South Sweden 1973-2013.

Author:
  • Leif Nilsson
Publishing year: 2014
Language: English
Pages: 129-146
Publication/Series: Ornis Svecica
Volume: 24
Document type: Journal article
Publisher: Sveriges Ornitologiska Förening

Abstract english

Regular September counts of staging waterbirds have
been undertaken annually in south Sweden since 1973
as a complement to the International Midwinter Counts
undertaken in January each year since 1967. The September
counts aim to cover the population development of
staging waterbirds, especially relating to species that are
not wintering in the country. Between 150 and about 200
sites have been included in the calculation of the September
indices, using the TRIM method. September indices
were calculated for 18 species. The trends over the entire
41-year period were significantly increasing for all but
five species (Anas platyrhynchos, Somateria mollissima
and Mergus serrator decreasing, whereas Podiceps cristatus
and Fulica atra did not show any clear long-term
trend). The September indices were in good agreement
with the International Midwinter Counts and the winter
counts of the Swedish Bird Survey, but much less well
with migration counts at Falsterbo and breeding season
counts of the Swedish Bird Survey. For the last ten years
of the series, six species showed a significantly increasing
trend, whereas four species decreased.

Keywords

  • Zoology
  • Ecology

Other

Published
  • ISSN: 1102-6812
Leif Nilsson
E-mail: leif [dot] nilsson [at] biol [dot] lu [dot] se

Professor emeritus

Biodiversity

+46 46 222 37 09

+46 70 525 57 09

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Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden