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Numbers of mute swans and Whooper Swans in Sweden, 1967-2000

Nilsson, Leif LU (2002) In Waterbirds special publication 25(sp 1). p.53-60
Abstract
Mute Swans (Cygnus olor) and Whooper Swans (Cygnus cygnus) in Sweden have been monitored as part of the International Waterbird Census (IWC) since 1967. For the Whooper Swan, midwinter indices show fluctuations around a slowly increasing trend. Country-wide surveys in 1971-72, 1988-89, 1995 and 2000, however found a more substantial increase in numbers, with national totals estimated at 2,000, 4,000, 8,000 and 8,000 individuals, respectively. The difference between the trends indices and the results of the country-wide surveys is attributable to the birds using more terrestrial habitats since the early 1980s, which are less well covered by the IWC. In 1995, 33% of the swans were found on land, compared to 43% in January 2000. For the Mute... (More)
Mute Swans (Cygnus olor) and Whooper Swans (Cygnus cygnus) in Sweden have been monitored as part of the International Waterbird Census (IWC) since 1967. For the Whooper Swan, midwinter indices show fluctuations around a slowly increasing trend. Country-wide surveys in 1971-72, 1988-89, 1995 and 2000, however found a more substantial increase in numbers, with national totals estimated at 2,000, 4,000, 8,000 and 8,000 individuals, respectively. The difference between the trends indices and the results of the country-wide surveys is attributable to the birds using more terrestrial habitats since the early 1980s, which are less well covered by the IWC. In 1995, 33% of the swans were found on land, compared to 43% in January 2000. For the Mute Swan, the midwinter indices showed a significantly increasing trend from 1970 to 2000, whereas autumn indices from September counts fluctuated around a more or less stable level, but with a decrease in the last few years. Country-wide midwinter counts recorded about 8,000 Mute Swans in 1973, 13,000 in 1988-89 and over 15,000 in january 1993. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Waterbirds special publication
editor
Rees, E C.; Earnst, S L.; Coulson, J; ; and
volume
25
issue
sp 1
pages
53 - 60
publisher
The Waterbird Society
ISSN
1524-4695
language
English
LU publication?
yes
id
452fe23c-650b-49c1-8d3e-3b8253223882 (old id 529735)
date added to LUP
2007-09-24 09:48:52
date last changed
2016-08-16 15:09:39
@inproceedings{452fe23c-650b-49c1-8d3e-3b8253223882,
  abstract     = {Mute Swans (Cygnus olor) and Whooper Swans (Cygnus cygnus) in Sweden have been monitored as part of the International Waterbird Census (IWC) since 1967. For the Whooper Swan, midwinter indices show fluctuations around a slowly increasing trend. Country-wide surveys in 1971-72, 1988-89, 1995 and 2000, however found a more substantial increase in numbers, with national totals estimated at 2,000, 4,000, 8,000 and 8,000 individuals, respectively. The difference between the trends indices and the results of the country-wide surveys is attributable to the birds using more terrestrial habitats since the early 1980s, which are less well covered by the IWC. In 1995, 33% of the swans were found on land, compared to 43% in January 2000. For the Mute Swan, the midwinter indices showed a significantly increasing trend from 1970 to 2000, whereas autumn indices from September counts fluctuated around a more or less stable level, but with a decrease in the last few years. Country-wide midwinter counts recorded about 8,000 Mute Swans in 1973, 13,000 in 1988-89 and over 15,000 in january 1993.},
  author       = {Nilsson, Leif},
  booktitle    = {Waterbirds special publication},
  editor       = {Rees, E C. and Earnst, S L. and Coulson, J},
  issn         = {1524-4695},
  language     = {eng},
  number       = {sp 1},
  pages        = {53--60},
  publisher    = {The Waterbird Society},
  title        = {Numbers of mute swans and Whooper Swans in Sweden, 1967-2000},
  volume       = {25},
  year         = {2002},
}